®
2635A
Hydra Series II Data Bucket
Users Manual
PN 686698
November 1997
© 1997 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.
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Table of Contents
Chapter
1
Title
Page
Introduction ....................................................................................................... 1-5
Operating Modes ............................................................................................... 1-5
Front Panel Operation................................................................................... 1-7
Memory Card Operation ............................................................................... 1-7
Computer Operation...................................................................................... 1-8
Printer Operation........................................................................................... 1-8
Modem Operation ......................................................................................... 1-8
Measurement Capabilities................................................................................. 1-9
Mx+B Scaling ............................................................................................... 1-9
Alarms........................................................................................................... 1-9
Totalizer Channel.......................................................................................... 1-9
Alarm Outputs and Digital I/O...................................................................... 1-9
Applications Software....................................................................................... 1-9
Hydra Starter Package................................................................................... 1-10
Hydra Logger ................................................................................................ 1-10
Options and Accessories ................................................................................... 1-10
Memory Card Reader.................................................................................... 1-10
Connector Set, 2620A-100............................................................................ 1-10
Setting Up the Instrument.................................................................................. 1-11
Adjusting the Handle .................................................................................... 1-12
AC Operation............................................................................................ 1-13
DC Operation............................................................................................ 1-13
Input Channels .............................................................................................. 1-13
Measurement Connections ................................................................................ 1-14
Using Shielded Wiring.................................................................................. 1-14
Crosstalk........................................................................................................ 1-14
Alarm Outputs Connections.......................................................................... 1-17
DC Power.................................................................................................. 1-17
Alarm Outputs .......................................................................................... 1-17
External Trigger Input .............................................................................. 1-17
Digital I/O Connections ................................................................................ 1-18
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2635A
Users Manual
Digital I/O................................................................................................. 1-18
Totalizer Input .......................................................................................... 1-18
Controls and Indicators ..................................................................................... 1-19
Front Panel Controls ..................................................................................... 1-19
Front Panel Indicators................................................................................... 1-19
2
Summary of Front Panel Operations................................................................. 2-5
Configuring the Instrument for Operation......................................................... 2-6
Turning the Power on.................................................................................... 2-6
Selecting a Channel....................................................................................... 2-8
Configuring a Measurement Channel................................................................ 2-8
Thermocouples ......................................................................................... 2-13
Thermocouple Restrictions:...................................................................... 2-13
Configuring a Channel Off ........................................................................... 2-16
Setting Operating Conditions............................................................................ 2-16
Setting the Scan Interval ............................................................................... 2-17
Setting the Measurement Rate ...................................................................... 2-18
Setting the Alarms......................................................................................... 2-18
Alarms and Autoprinting.......................................................................... 2-20
Alarms and Mx+B Scaling ....................................................................... 2-20
Setting the Mx+B Scaling............................................................................. 2-23
Examples................................................................................................... 2-23
Restrictions ............................................................................................... 2-23
Operating Modes ............................................................................................... 2-26
Using the Scan Mode .................................................................................... 2-26
Memory Card Formatting......................................................................... 2-26
Memory Card Capacity............................................................................. 2-26
Memory Card Files................................................................................... 2-26
Memory Card Error Messages ...................................................................... 2-28
Using the Monitor Mode............................................................................... 2-29
Using the Review Mode................................................................................ 2-30
Additional Features ........................................................................................... 2-31
Scan Triggering Options ............................................................................... 2-31
External Trigger........................................................................................ 2-31
Monitor-Alarm Trigger............................................................................. 2-31
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Contents (continued)
Totalizer Operation ....................................................................................... 2-32
Digital Input/output Lines............................................................................. 2-33
Setting Date and Time................................................................................... 2-34
Returning to the Local Mode ........................................................................ 2-35
Front Panel Key Lockout Options ................................................................ 2-36
Instrument Interfaces......................................................................................... 2-36
Memory Card Interface................................................................................. 2-36
RS-232 Computer Interface .......................................................................... 2-37
3
Memory Card Files ....................................................................................... 3-3
Setup Files..................................................................................................... 3-4
Data Files ...................................................................................................... 3-4
Memory Card Capacity................................................................................. 3-4
Memory Card Battery ................................................................................... 3-5
Inserting a Memory Card .............................................................................. 3-5
Removing a Memory Card............................................................................ 3-5
Initializing a Memory Card ............................................................................... 3-7
Setup File Procedures........................................................................................ 3-9
Using Setup Store.......................................................................................... 3-9
Using Setup Load.......................................................................................... 3-10
Using Setup Erase ......................................................................................... 3-11
Data File Procedures ......................................................................................... 3-12
Using Data Open........................................................................................... 3-12
Using Data Erase........................................................................................... 3-13
Setup and Data Files Directory ......................................................................... 3-14
Setup and Data File Current Status ................................................................... 3-15
4
Summary of Computer Operations.................................................................... 4-3
Connecting the Instrument to a PC.................................................................... 4-3
How the Instrument Processes Input............................................................. 4-12
Input Terminators.......................................................................................... 4-12
Input String Examples................................................................................... 4-13
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2635A
Users Manual
Status Registers............................................................................................. 4-14
Status Byte Register (STB)....................................................................... 4-17
Xmodem File Transfers ................................................................................ 4-18
5
Printer Operations ............................................................................. 5-1
Summary of Printer Operations......................................................................... 5-3
Connecting the Instrument to a Printer.............................................................. 5-3
Configuring for Printer Operations ................................................................... 5-5
Problems?...................................................................................................... 5-6
Printing the Review Array ............................................................................ 5-8
6
7
Summary of Modem Operations ....................................................................... 6-3
Connecting the Modem to an Instrument .......................................................... 6-6
Testing the RS-232/Modem Interface ............................................................... 6-8
Maintenance....................................................................................... 7-1
Introduction ....................................................................................................... 7-3
Cleaning............................................................................................................. 7-3
Line Fuse ........................................................................................................... 7-3
Selftest Diagnostics and Error Codes................................................................ 7-4
Performance Tests............................................................................................. 7-4
Accuracy Verification Test........................................................................... 7-7
Channel Integrity Test................................................................................... 7-8
Four-Terminal Resistance Test..................................................................... 7-10
Digital Input/Output Verification Tests........................................................ 7-15
Digital Output Test ................................................................................... 7-15
Digital Input Test...................................................................................... 7-16
Totalizer Test............................................................................................ 7-17
Totalizer Sensitivity Test.......................................................................... 7-18
Dedicated Alarm Output Test ....................................................................... 7-18
External Trigger Input Test........................................................................... 7-21
Calibration......................................................................................................... 7-21
Variations in the Display................................................................................... 7-22
Service............................................................................................................... 7-22
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Contents (continued)
Appendices
A Specifications.............................................................................................. A-1
B Crosstalk Considerations ............................................................................ B-1
C Binary Upload of Logged Data................................................................... C-1
D RS-232 Cabling........................................................................................... D-1
E
F
Memory Card File Formats......................................................................... F-1
G True RMS Measurements ........................................................................... G-1
Index
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2635A
Users Manual
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List of Tables
Table
Title
Page
1-1. Data Bucket Features............................................................................................. 1-6
1-2. Options and Accessories........................................................................................ 1-11
1-3. Front Panel Keys Description................................................................................ 1-21
1-4. Annunciator Descriptions...................................................................................... 1-22
2-1. Configuration Reset (Default) Settings ................................................................. 2-7
2-2. Selftest Error Codes............................................................................................... 2-7
2-3. Thermocouple Ranges ........................................................................................... 2-14
2-4. TLL Alarm Outputs (Channels 0 to 3) .................................................................. 2-20
2-5. TTL Alarm Outputs (Channels 4 to 20) ................................................................ 2-21
3-1. Memory Card Error Codes .................................................................................... 3-6
4-1. Instrument Event Register (IER) ........................................................................... 4-16
4-2. Event Status Register (ESR).................................................................................. 4-17
4-3. Status Byte Register (STB).................................................................................... 4-18
4-4. Command and Query Summary............................................................................. 4-19
4-5. Command and Query Reference............................................................................ 4-23
7-1. Power-Up Error Codes........................................................................................... 7-4
7-2. Recommended Test Equipment............................................................................. 7-6
7-3. Performance Tests (Voltage, Resistance, and Frequency) .................................... 7-7
7-6. Performance Tests for RTD Temperature Function (DIN/ IEC 751
Amendment 2)(ITS-90).......................................................................................... 7-15
7-7. Digital Input Values............................................................................................... 7-17
A-1. DC Voltage Measurements - Resolution ............................................................... A-2
A-2. DC Voltage Measurements - Accuracy ................................................................. A-2
A-3. AC Voltage Measurements - Resolution ............................................................... A-4
A-4. AC Voltage Measurements - Accuracy ................................................................. A-4
A-7. Temperature Measurements - Accuracy (RTDs) (IEC751 Amendment 2)
(ITS-90................................................................................................................... A-7
A-8. Temperature Measurements - Accuracy (RTDs) (IEC751 Amendment 1)
(ITS-90) ................................................................................................................. A-7
A-10. AC Voltage Measurements - Resolution ............................................................... A-9
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2635A
Users Manual
A-11. AC Voltage Measurements - Accuracy ................................................................. A-9
A-12. AC Voltage Measurements.................................................................................... A-10
A-13. Resistance Measurements - Resolution. ................................................................ A-11
A-14. Resistance Measurements - Accuracy (Four-Wire)............................................... A-11
A-15. Frequency Measurements-Resolution and Accuracy ............................................ A-12
A-16. Frequency Measurements - Input Sensitivity ........................................................ A-12
A-17. Typical Scanning Rate........................................................................................... A-13
A-18. Autoranging Rates ................................................................................................. A-14
C-1. Floating-Point Format............................................................................................ C-5
E-1. 8-Bit Binary-Coded-Decimal................................................................................. E-2
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List of Figures
Figure
Title
Page
1-1. Data Bucket Front and Rear Panels....................................................................... 1-7
1-2. Typical Front Panel Display While Scanning ....................................................... 1-8
1-3. Adjusting the Handle............................................................................................. 1-12
1-4. Connecting the Instrument to a Power Source....................................................... 1-13
1-5. Universal Input Module Connections.................................................................... 1-15
1-6. Two-Terminal and Four-Terminal Connections.................................................... 1-16
1-7. ALARM OUTPUTS connector ............................................................................. 1-17
1-8. DIGITAL I/O Connector ....................................................................................... 1-18
1-9. Front Panel Keys.................................................................................................... 1-19
1-10. Primary Display..................................................................................................... 1-19
1-11. Secondary Display................................................................................................. 1-20
1-12. Annunciator Display.............................................................................................. 1-20
2-1. How to use the Control/Annunciator Diagrams .................................................... 2-5
2-2. Turning the Power On ........................................................................................... 2-6
2-3. Selecting a Channel ............................................................................................... 2-8
2-4. Configuring a Channel to Measure DC Volts........................................................ 2-10
2-5. Configuring a Channel to Measure AC Volts........................................................ 2-11
2-6. Configuring a Channel to Measure Resistance...................................................... 2-11
2-7. Configuring a Channel to Measure Frequency...................................................... 2-12
2-10. Configuring a Channel Off .................................................................................... 2-16
2-11. Setting the Scan Interval........................................................................................ 2-17
2-12. Setting the Measurement Rate............................................................................... 2-18
2-13. Setting the Alarms ................................................................................................. 2-22
2-14. Setting the Mx+B Scaling...................................................................................... 2-24
2-15. Using the Scan Mode............................................................................................. 2-27
2-16. Memory Card Error Messages............................................................................... 2-28
2-17. Using the Monitor Mode ....................................................................................... 2-29
2-18. Using the Review Mode ........................................................................................ 2-30
2-19. Scan Triggering Options........................................................................................ 2-32
2-20. Totalizer Operation................................................................................................ 2-33
2-21. Setting Date and Time ........................................................................................... 2-34
2-22. Reading Instrument Software Versions................................................................. 2-35
2-23. Returning to LOCAL Mode................................................................................... 2-35
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2635A
Users Manual
2-24. Front Panel Key Lockout Options ......................................................................... 2-36
3-1. Typical Memory Card............................................................................................ 3-3
3-2. Front Panel Memory Card Percent Display........................................................... 3-5
3-3. Initializing a Memory Card.................................................................................... 3-7
3-4. Recording Measurement Results During Scanning............................................... 3-8
3-5. Using SETUP STORE to Save Configuration Files.............................................. 3-9
3-6. Using SETUP LOAD to Load Configuration Files............................................... 3-10
3-7. Using SETUP ERASE to Delete Configuration Files ........................................... 3-11
4-1. Connecting the Instrument to a PC........................................................................ 4-4
4-2. Configuring the Instrument for Computer Operations .......................................... 4-5
4-3. Overview of Status and Event Data Registers....................................................... 4-15
4-4. Sample Program (GWBASIC)............................................................................... 4-57
4-5. Sample Program (QBASIC)................................................................................... 4-59
4-6. Sample Program (QuickC) (1of 5)......................................................................... 4-62
5-1. Connecting the Instrument to a Printer.................................................................. 5-4
5-2. Configuring the RS-232 Ports for Print Operations .............................................. 5-5
5-3. Printing Measurement Results During Scanning................................................... 5-7
5-4. Printing the Review Array..................................................................................... 5-8
5-5. Printing the Memory Card Directory..................................................................... 5-10
6-1. Overall PC-to-Instrument Modem Connection...................................................... 6-3
6-2. Connecting the Modem to a PC............................................................................. 6-5
6-3. Connecting the Modem to an Instrument .............................................................. 6-6
7-1. Replacing the Line Fuse ........................................................................................ 7-3
7-2. Four-Terminal Connections to 5700A................................................................... 7-12
7-3. Four-Terminal Connections to Decade Resistance Box........................................ 7-14
7-4. Dedicated Alarms Output Test .............................................................................. 7-20
7-5. External Trigger Test............................................................................................. 7-21
C-1. ASCII String Decoding.......................................................................................... C-3
C-2. Floating_Point Conversion .................................................................................... C-6
C-3. Example ................................................................................................................. C-8
D-1. Summary of RS-232 Connections ......................................................................... D-3
D-3. Hydra (DB-9) to PC (DB-25) RS-232 Connection................................................ D-5
D-6. RS-232 DB-9 and DB-25 Connectors.................................................................... D-8
G-1. Comparison of Common Waveforms .................................................................... G-2
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CAUTION
THIS IS AN IEC SAFETY CLASS 1 PRODUCT. BEFORE USING, THE GROUND WIRE IN THE
LINE CORD OR THE REAR PANEL BINDING POST MUST BE CONNECTED FOR SAFETY.
Interference Information
This equipment generates and uses radio frequency energy and if not installed and used in strict
accordance with the manufacturer’s instructions, may cause interference to radio and television
reception. It has been type tested and found to comply with the limits for a Class B computing
device in accordance with the specifications of Part 15 of FCC Rules, which are designed to
provide reasonable protection against such interference in a residential installation.
Operation is subject to the following two conditions:
•
•
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause
undesired operation.
There is no guarantee that interference will not occur in a particular installation. If this equipment
does cause interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one of more of
the following measures:
•
•
•
•
Reorient the receiving antenna
Relocate the equipment with respect to the receiver
Move the equipment away from the receiver
Plug the equipment into a different outlet so that the computer and receiver are on different
branch circuits
If necessary, the user should consult the dealer or an experienced radio/television technician for
additional suggestions. The user may find the following booklet prepared by the Federal
Communications Commission helpful: How to Identify and Resolve Radio-TV Interference
Problems. This booklet is available from the U.S. Government Printing Office, Washington, D.C.
20402. Stock No. 004-000-00345-4.
Declaration of the Manufacturer or Importer
We hereby certify that the Fluke Model 2635A Data Bucket is in compliance with BMPT Vfg
243/1991 and is RFI suppressed. The normal operation of some equipment (e.g. signal
generators) may be subject to specific restrictions. Please observe the notices in the users
manual. The marketing and sales of the equipment was reported to the Central Office for
Telecommunication Permits (BZT). The right to retest this equipment to verify compliance with the
regulation was given to the BZT.
Bescheinigung des Herstellers/Importeurs
Hiermit wird bescheinigt, daβ Fluke Model 2635A Data Bucket in Übereinstimung mit den
Bestimmungen der BMPT-AmtsblVfg 243/1991 funk-entstört ist. Der vorschriftsmäßige Betrieb
mancher Geräte (z.B. Meßsender) kann allerdings gewissen Einschränkungen unterliegen.
Beachten Sie deshalb die Hinweise in der Bedienungsanleitung. Dem Bundesamt für Zulassungen
in der Telekcommunikation wurde das Inverkehrbringen dieses Gerätes angezeigt und die
Berechtigung zur Überprüfung der Seire auf Einhaltung der Bestimmungen eingeräumt.
Fluke Corporation
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Safety Terms in this Manual
This instrument has been designed and tested in accordance with iec publication 1010,
safety requirements for electrical measuring, control and laboratory equipment. This user
manual contains information, warnings, and cautions that must be followed to ensure
safe operation and to maintain the instrument in a safe condition. Use of this equipment
in a manner not specified herein may impair the protection provided by the equipment.
The meter is designed for iec 664, installation category ii use. It is not designed for use
in circuits rated over 4800va.
Warning statements identify conditions or practices that could result in personal injury
or loss of life.
Caution statements identify conditions or practices that could result in damage to
equipment.
Symbols Marked on Equipment
danger - high voltage.
ground (earth) terminal.
protective ground (earth) terminal. Must be connected to safety earth
ground when the power cord is not used. See Chapter 2.
attention - refer to the manual. This symbol indicates that information
about usage of a feature is contained in the manual. This symbol appears
in the following two places on the instrument rear panel:
1. Ground binding post (left of line power connector). Refer to "Using
External DC Power" in Chapter 2.
2. Alarm outputs/digital i/o connectors. Refer to Appendix A,
Specifications.
Warning
To avoid electric shock:
•
When the input module is installed, consider all channels
with connections as accessible terminals that may be
hazardous live.
•
•
Disconnect the input module before touching or changing
external wiring.
Remove inputs from live voltages before opening the input
module.
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Contents (continued)
AC Power Source
The instrument is intended to operate from an ac power source that will not apply more
than 264v ac rms between the supply conductors or between either supply conductor and
ground. A protective ground connection by way of the grounding conductor in the power
cord is required for safe operation.
DC Power Source
The instrument may also be operated from a 9 to 16v dc power source when either the
rear panel ground binding post or the power cord grounding conductor is properly
connected.
Use the Proper Fuse
To avoid fire hazard, use only a fuse identical in type, voltage rating, and current rating
as specified on the rear panel fuse rating label.
Grounding the Instrument
The instrument utilizes controlled overvoltage techniques that require the instrument to
be grounded whenever normal mode or common mode ac voltages or transient voltages
may occur. The enclosure must be grounded through the grounding conductor of the
power cord, or if operated on battery with the power cord unplugged, through the rear
panel ground binding post.
Use the Proper Power Cord
Use only the power cord and connector appropriate for the voltage and plug
configuration in your country.
Use only a power cord that is in good condition.
Refer cord and connector changes to qualified service personnel.
Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operate the instrument in an atmosphere of explosive gas.
Do Not Remove Cover
To avoid personal injury or death, do not remove the instrument cover. Do not operate
the instrument without the cover properly installed. Normal calibration is accomplished
with the cover closed, and there are no user-serviceable parts inside the instrument, so
there is no need for the operator to ever remove the cover. Access procedures and the
warnings for such procedures are contained in the service manual. Service procedures
are for qualified service personnel only.
Do Not Attempt to Operate if Protection may be Impaired
If the instrument appears damaged or operates abnormally, protection may be impaired.
Do not attempt to operate it. When in doubt, have the instrument serviced.
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Ten Minute Tour
Introduction
Note
This manual contains information and warnings that must be followed to
ensure safe operation and keep the instrument in safe condition.
Data Bucket operation and operational features can be understood in about ten minutes
by completing the following procedure. Prior to staring the procedure, connect the
instrument to a power source (see Chapter 1) and connect the supplied test leads to the
front panel jacks (Channel 0). Some steps terminate when you press the C key instead
of the E key because the completed step is beyond the scope of this quick tour.
However, all steps contain a figure reference in brackets [] for additional information.
For example, the first step of applying power refers to [Figure 2-2], which describes
three other ways of applying power (Configuration-Reset, Display-Hold, and
Temperature-Toggle). Therefore, this procedure may be used for a quick instrument
familiarization or as a basis for instrument applications.
It is assumed that the instrument is being powered for the first time or a configuration-
reset procedure cleared the instrument of configuration data. To apply a configuration-
reset to the instrument, hold down the C key when turning on the power and keep
holding until the meter “beeps” in acknowledgment.
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Ten Minute Tour (continued)
Applying power. Press the power switch to
apply power. Other power-on options include
Configuration-Reset, Display-Hold, and
Temperature-Toggle. [Figure 2-2]
POWER
Selecting a Channel. Up/down arrow keys
select a channel from 0 to 20. Channel 0
connections are on the front panel; Channels 1
through 20 connections are via the rear-panel
Universal Input Module. Select Channel 10.
[Figure 2-3]
CH
20
...
10
...
0
Selecting a Function. Press the FUNC key to
open the function menu. Up/down arrow keys
select a function. Temperature unit °F/°C is set
with the Temperature-Toggle Power-On
procedure. Select VAC, then press ENTER.
[Figure 2-5]
SET FUNC
FUNC
OFF
°F [°C]
Hz
Ω
VAC
V DC
ENTER
Selecting a Measurement Scale. Up/down
arrow keys select a measurement scale. AUTO
indicates autoranging, where the instrument
automatically selects the scale that provides the
best measurement resolution. Scale values are
maximum expected readings, e.g., the 30.000
VAC scale is for measurements of 30 VAC or
less. Select 150.00 V scale, then press ENTER.
Channel 10 is now configured. [Figure 2-5]
SET FUNC
Auto
150.00 V
30.000 V
3.0000 V
300.00 mV
ENTER
A
op79_1f.eps
Ten Minute Tour
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2635A
Users Manual
A
Selecting a Channel. Select Channel 0 with the
up/down arrow keys. Notice each key entry is
acknowledged with a short "beep." Try the
left/right arrow keys and notice a long beep.
Short beeps represent correct entries; long beeps
represent incorrect entries. [Figure 2-3]
CH
20
...
10
...
0
Selecting a Function. Press FUNC to open the
function menu, use up/down arrow keys to select
Ω, then press ENTER. [Figure 2-6]
SET FUNC
FUNC
ENTER
ENTER
OFF
°F [°C]
Hz
Ω
VAC
V DC
Selecting a Measurement Scale. Select the
300.00 scale with up/down arrow keys, then
press ENTER. [Figure 2-6]
SET FUNC
Auto
10.000 M
3.0000 M
300.00 k
30.000 k
3.0000 k
300.00
Selecting
a
Terminal
Configuration.
SET FUNC
Resistance measurements for channels
1
through 10 can use two channels (4 terminals) for
increased precision. For channels 0 and 11 to
20, only 2 terminal (2T) connections are allowed.
Press ENTER. [Figure 2-6]
2T
4T
ENTER
B
op79_2f.eps
Ten Minute Tour (cont)
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Ten Minute Tour (continued)
B
MON
Selecting the Monitor Mode. Press the MON
MON
key to enable monitoring. Up/down arrow keys
select any configured channel for monitoring.
When Channel 0 (Ω) is selected, touch the probe
tips together to measure test lead resistance.
Channel 10 (VAC) may have a small reading
because the input is unterminated. Press MON to
exit monitoring. [Figure 2-17]
0
10
MON
Selecting the SCAN Mode. Press the SCAN
key to enable scanning. The display will indicate
which channel is being measured during the
scan. Monitor or Review can be enabled during
scanning. Measurement data can be routed to
the memory card, printer, or PC for display or
processing. Press SCAN to exit scanning.
[Figure 2-15]
SCAN
0
SCAN
SCAN
10
SHIFT
Selecting the Single Scan Mode. Press the
SHIFT key, release, then press the SCAN key to
make a SINGLE measurement scan.
[Figure 2-15]
SCAN
0
SCAN
10
C
op79_3f.eps
Ten Minute Tour (cont)
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2635A
Users Manual
C
INTVL
Setting the Scan Interval. Press the INTVL key
to open the interval menu. Up/down and left/right
arrow keys select 0:00:00 (default) to 9:99:99.
The format is HOURS:MINUTES:SECONDS.
The scan interval is the total time between the
start of each measurement cycle. 0:00:00
represents continuous scanning. Press CANCL
to exit. [Figure 2-11]
SET
0:00:00
CANCL
REVIEW
Selecting the Review Mode.
Press the
REVIEW
REVIEW key to open the Review array. The
Review array holds the last, maximum, and
minimum readings during all previous scans for
all configured channels. Up/down arrow keys
select the channel, while left/right arrow keys
select LAST, MAX, and MIN. To CLEAR the
Review array, press the SHIFT key, release,
then press the REVIEW key. The Review array
is cleared automatically by changing any
parameter on any channel (including
Measurement Rate). Press CANCL to exit.
[Figure 2-18]
LAST MIN MAX
0
10
SHIFT
REVIEW
CANCL
Select Channel 10. Select Channel 10 with the
up/down arrow keys. [Figure 2-3]
CH
20
...
10
...
0
D
op79_4f.eps
Ten Minute Tour (cont)
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Ten Minute Tour (continued)
D
ALRM
Selecting Alarms. Press the ALRM key to open
SET ALARM
the alarm menu. Each configured channel can
have two alarm limits assigned. An alarm is set
when a reading is below or above an alarm limit.
Configuration starts with an alarm limit selection,
1 or 2. Press CANCL to exit. [Figure 2-13]
1
2
CANCL
Mx+B
Setting Mx+B Scaling. Press the Mx+B key to
open the Mx+B menu. Up/down and left/right
arrow keys select the digits for the first parameter
(M) (default +001.00). The effect of Mx+B scaling
is to take a measurement (x) and modify it by
multiplying the measurement with M and then
adding an offset B (configured after M is set). For
SET Mx+B
M
+001.00
example, Mx+B=+1.5x+25 applied to
a
measurement of 20.000 would display
1.5(20.000) + 25 = 55.000. Press CANCL to exit.
[Figure 2-14]
CANCL
SHIFT
Selecting the Measurement Rate. Press the
SHIFT key, release, then press the Right Arrow
key to open the RATE menu. During the
measurement portion of the scan interval, the
measurement rate can be FASt (Fast) or SLO
RAtE
FASt
SLO
(Slow).
The slow rate gives full 5-digit
measurement resolution, while the fast rate gives
only 4-digit resolution. The advantage of a fast
measurement rate is more readings during
continuous scanning or low scan intervals. Press
CANCL to exit. [Figure 2-12]
CANCL
E
op79_5f.eps
Ten Minute Tour (cont)
xix
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2635A
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E
SHIFT
INTVL
Setting Date and Time. Press the SHIFT key,
release, then press the INTVL key to open the
date and time (CLOCK) menu. Up/down and
left/right arrow keys select the YEAR 00 to 99.
For the complete procedure, this is followed by
MONTH:DAY and HOURS:MINUTES. Press
CANCL to exit. [Figure 2-21]
yEAR
94
CANCL
Selecting the Totalizer Feature. Press the
TOTAL key to open the totalizer display. The
totalizer operates independently as a separate
instrument function. Contact closures or voltage
totAL
0
TOTAL
SHIFT
transitions between pins Σ and
on the rear
panel DIGITAL I/O connector are totaled and
displayed by pressing the TOTAL key. To ZERO
the total (already 0 in this example), press the
SHIFT key, release, then press the TOTAL key
again. Press CANCL to exit. [Figure 2-20]
TOTAL
CANCL
F
op79_6f.eps
Ten Minute Tour (cont)
xx
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Ten Minute Tour (continued)
F
SHIFT
MON
Selecting Triggering Options. Press the SHIFT
tRIg
ALAr
On
OFF
key, release, then press the MON key to open
the TRIGS option menu. A trigger option can
trigger scanning, instead of using the SCAN key.
OFF indicates no triggering option; ON indicates
the external trigger option is active (a contact
closure or voltage transition between pins TR and
on the rear panel ALARM OUTPUTS connector);
ALAr (Alarm) indicates scan triggering when a
monitored channel goes into Alarm. Press
CANCL to exit. [Figure 2-19]
CANCL
SHIFT
LIST
Setting the Communication Parameters.
Press the SHIFT key, release, then press the
LIST key to open the COMM menu. The
communication parameters configure the rear-
panel RS-232 interface for printer and PC
operations. The first selection is bAUd (Baud)
with rates from 300 to 38400 baud. For the
complete procedure, this is followed by parity,
flow control and echo. Press CANCL to exit.
[Figure 5-2]
bAUd
38400
...
300
CANCL
G
op79_7f.eps
Ten Minute Tour (cont)
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2635A
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G
LIST
Setting the LIST Parameters. Press the LIST
key to open the LIST menu. LIST is used to print
out all the measurements from the Review Array,
or print out a directory of all the files on the
memory card by selecting dir (Directory). To use
LIST, a printer (or PC) must be connected to the
RS-232 port. Press CANCL to exit. [Figure 5-4]
LISt
dir
LASt
CANCL
SHIFT
FILES
Setting the DESTINATION Parameter. Press
the SHIFT key, release, then press the FILES
key to open the MODE menu. CArd (Card)
routes data to the memory card; Print (Print)
routes data to the RS-232 connector to a printer
(or PC); both (Both) routes data to both
destinations, and nonE (None) to neither
destination. Select CArd and press ENTER.
[Figure 5-3]
dESt
both
Print
CArd
nonE
ENTER
Selecting the Destination Mode. ALL (All)
sends all measurement data to the destination
device (Memory Card in this example); ALAr
(Alarm) send all measurement data to the
destination device when any scanned channel is
in alarm; trAnS (Transition) sends all
measurement data to the destination device
when any scanned channel transitions into or out
of an alarm condition. Press CANCL to exit.
[Figure 5-3]
MODE
trAnS
ALAr
ALL
CANCL
H
op79_8f.eps
Ten Minute Tour (cont)
xxii
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Ten Minute Tour (continued)
H
FILES
Selecting the File Options. Press the FILES
key to open the Files menu. This menu selects
the memory card functions. SEtUP (Setup)
FILES
Init
StAt
dir
dAtA
SEtUP
selects
card
functions
for
instrument
configuration files (SEtxx); dAtA (Data) selects
card functions for measurement data files
(dAtxx); dir (Directory) lists the number of
kilobytes free on the card and the name and size
of each SEtxx and dAtxx file; StAt (Status) lists
which SEtxx and dAtxx files are currently active
and percentage of the card that is used; Init
(Initialize) formats a blank card or erases and
formats a used card. Press CANCL to exit.
[Figure 3-3]
CANCL
op79_9f.eps
Ten Minute Tour (cont)
xxiii
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2635A
Users Manual
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Chapter 1
Preparation for Use
Title
Page
Introduction ....................................................................................................... 1-5
Operating Modes ............................................................................................... 1-5
Front Panel Operation................................................................................... 1-7
Memory Card Operation ............................................................................... 1-7
Computer Operation...................................................................................... 1-8
Printer Operation........................................................................................... 1-8
Modem Operation ......................................................................................... 1-8
Measurement Capabilities................................................................................. 1-9
Mx+B Scaling ............................................................................................... 1-9
Alarms........................................................................................................... 1-9
Totalizer Channel.......................................................................................... 1-9
Alarm Outputs and Digital I/O...................................................................... 1-9
Applications Software....................................................................................... 1-9
Hydra Starter Package................................................................................... 1-10
Hydra Logger ................................................................................................ 1-10
Options and Accessories ................................................................................... 1-10
Memory Card Reader.................................................................................... 1-10
Connector Set, 2620A-100............................................................................ 1-10
Setting Up the Instrument.................................................................................. 1-11
Adjusting the Handle .................................................................................... 1-12
AC Operation............................................................................................ 1-13
DC Operation............................................................................................ 1-13
Input Channels .............................................................................................. 1-13
Measurement Connections ................................................................................ 1-14
Using Shielded Wiring.................................................................................. 1-14
Crosstalk........................................................................................................ 1-14
Alarm Outputs Connections.......................................................................... 1-17
DC Power.................................................................................................. 1-17
Alarm Outputs .......................................................................................... 1-17
External Trigger Input .............................................................................. 1-17
Digital I/O Connections ................................................................................ 1-18
Digital I/O................................................................................................. 1-18
1-1
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2635A
Users Manual
Totalizer Input .......................................................................................... 1-18
Controls and Indicators ..................................................................................... 1-19
Front Panel Controls ..................................................................................... 1-19
Front Panel Indicators................................................................................... 1-19
1-2
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Preparation for Use
Introduction
1
1-3
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2635A
Users Manual
REVIEW
LAST
SERIES II
HYDRA
CH
mA
mVDCAC
Hz
Mk
V
COM
REVIEW
CLEAR
FILES
MODE
INTVL
SCAN
CLOCK
ALRM
FUNC
Mx+B
SINGLE
300V
MAX
RATE
MON
TOTAL
ZERO
ENTER
LIST
SHIFT
CANCEL
TRIGS
COMM
LOCAL
BATT
BUSY
OP80F.EPS
1-4
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Preparation for Use
Introduction
1
NOTE
This manual contains information and warnings that must be followed to
ensure safe operation and keep the instrument in safe condition.
Introduction
The Fluke 2635A Hydra Series II Data Bucket is a 21-channel data logging instrument
that measures and records the following electrical and physical parameters: dc volts, ac
volts, resistance, frequency, and temperature. Temperature measurements are via
thermocouples or resistance-temperature detectors (RTDs). Other parameters can be
measured with an appropriate transducer, such as air pressure/vacuum (using a Fluke
PV350 transducer module) or DC current (using a Fluke 2600A-101 shunt resistor).
When the instrument scans channels configured for measurement, readings can be
displayed, printed out, and recorded. Virtually any analog input may be applied without
external signal conditioning. The inputs for channels 1 through 20 are via a Universal
Input Module, which plugs into the rear of the unit for a quick connect/disconnect
capability. Channel 0 measurements are via the front panel input jacks using test leads
(supplied). For a quick introduction to the operation of the instrument, complete the Ten-
Minute Tour at the front of this manual. A summary of the Hydra Series II Data Bucket
features is provided in Table 1-1 and complete specifications in Appendix A. Figure 1-1
shows the instrument front and rear panels.
Operating Modes
The Data Bucket may be used in a wide variety of applications using one or more of five
operating modes:
•
•
•
•
•
Front Panel Operation
Memory Card Operation
Computer Operation
Printer Operation
Modem Operation
1-5
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2635A
Users Manual
Table 1-1. Data Bucket Features
•
Channel Scanning
Can be continuous scanning, scanning at an interval time, single scans, or triggered (internal or
external) scans. Channel Monitoring may be used while scanning.
•
•
Channel Monitoring
Make measurements on a single channel and view these measurements on the display.
Memory Card
Store measurement data and meter configuration setup data on a removable nonvolatile RAM
card.
•
Multi-Function Display
Primary display shows measurement readings; also used when setting numeric parameters.
Secondary display used for numeric entries, channel number selection and display, status
information, and operator prompts.
Annunciator display used to show measurement units, alarms review parameters, remote status,
and configuration information.
•
•
Front-Panel Operation
Almost all operations can be readily controlled with the front panel keys.
Measurement Input Function and Range
Volts dc (VDC), volts ac (VAC), frequency (HZ), and resistance (e) inputs can be specified in a
fixed measurement range. Autoranging, which allows the instruments to use the measurement
range providing the optimum resolution, can also be selected.
•
Temperature Measurement
Thermocouple types J, K, E, T, N, R, S and B, and Hoskins Engineering Co. type C are supported.
Also, DIN/IEC 751 Platinum RTDs are supported.
•
•
•
•
•
•
Totalize Events on the Totalizing Input
Alarm Limits and Digital Output Alarm Indication
Four-Terminal Resistance Measurements (Channels 1 through 10 only)
RS-232 Computer Interface Operation
Measurement Rate Selection
Nonvolatile Memory
Storage of minimum, maximum, and most recent measurements for all scanned channels.
Storage of Computer Interface setup, channel configurations, and calibration values.
Internal storage of measurement data: storage for 100 scans of up to 21 channels, accessible only
through the computer interface.
1-6
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Preparation for Use
Operating Modes
1
Ground Terminal.
Connects mainframe
to ground.
AC Power Connector.
Connect to any line source
of 90 to 264 VAC (50/60 Hz).
Universal Input Module.
Directly wires 20 analog inputs
(Channels 1 to 20) without
external signal conditioning.
FOR FIRE PROTECTION
REPLACE WITH T 1/8A 250V (SLOW) FUSE
CAUTION
MODEL: 2620A
25A
2635A
90-264V
50/60 Hz
15VA
!
IEC 664 INSTALLATIONCATEGORY II
ALARM OUTPUTS
DIGITAL I/O
RS-232C
IEEE STD-488 PORT
+ –
0
1
2
3 TR
0
1
2
3
4
5
6
7
Σ
9
5
8
7
6
1
4
3
2
+30V
!
9-16 V
DC PWR
SH1, AH1, T5, L4, SR1, RL1, DC1, DT1, PP0, C0, E1
MEETS Vfg. 243/1991
COMPLIES WITHFCC-15B
[DSR]
[RTS]
TX
GND
RX
[2635A ONLY] [CTS] DTR
Alarm Outputs Connector.
Digital I/O Connector.
Outputs alarms for
channels 4 to 20 (default),
inputs totalizer (Σ and ).
RS-232C.
Interfaces instrument with
a printer, PC or modem.
Outputs alarms for channels 0 to 3,
DC power inputs for DC operation
(9 to 16V dc), inputs external scan
trigger (TR and ).
op01f.eps
Figure 1-1. Data Bucket Front and Rear Panels
Front Panel Operation
Front panel operations include configuration of channels in preparation for scanning
operations and simple multimeter operation by placing the instrument in the Monitor
mode then using the front panel jacks and test leads (channel 0) for measurements. Front
panel operations are discussed in Chapter 2.
Memory Card Operation
An adjunct to stand-alone front panel use are operations that use the memory card
feature. The memory card is a Static Random Access Memory (SRAM) device that plugs
into a slot on the Data Bucket front panel. An internal battery maintains the integrity of
the stored data. An empty 256K-byte card stores 8500 scans of 4 channels, 4500 scans of
10 channels, or 2500 scans of 20 channels. A typical display while scanning using the
memory card is shown in Figure 1-2. The PC-compatible memory card can be used to
store measurement files and configuration files. Data extraction from the card requires a
1-7
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2635A
Users Manual
personal computer (PC), where data can be sent from the Data Bucket to the PC over an
RS-232 link (up to a 38,400 baud rate), or the card can be removed and taken to a PC
equipped with a memory card reader (see Options and Accessories). Memory card
operations are discussed in Chapter 3.
ALARM Annunciator.
Indicates that one (or
more) of the scanned
channels is in alarm.
18 (Channel) Scanned.
Indicates the channel
being measured during
channel scanning.
SCAN Annunciator.
Indicates the instrument is
in the Scan mode (vs
Monitor or Review mode).
SCAN
ALARM
PRN CH
PRN (Print) Annunciator.
Indicates the destination
for the data is the memory
card or printer.
Memory Card Status.
Card has used 42% of its
capacity. After 99%, FULL
is displayed.
CH (Channel) Annunciator.
Indicates the number in the
secondary display is a
channel.
op02f.eps
Figure 1-2. Typical Front Panel Display While Scanning
Computer Operation
The Data Bucket can serve as a front-end data acquisition unit for PC-based operations,
operating over an RS-232 link. The applications software for operating the RS-232 link
includes the supplied Hydra Starter Package (Starter) and optional Hydra Logger
(Logger) (see "Applications Software" below). Computer operations are discussed in
Chapter 4.
Printer Operation
Measurement data from the Data Bucket can be routed to a printer via an RS-232 link.
At the completion of each scan cycle, measurement data is printed, providing hardcopy
output. Any compatible printer with a serial input may be used. Printers with a parallel
input may be used if they are equipped with a serial-to-parallel adapter. Printer
operations are discussed in Chapter 5.
Modem Operation
An RS-232 link between the Data Bucket and a modem allows data transfers over
telephone lines. Operation is similar to computer operations, except there is a modem
link instead of a direct RS-232 connection. The modem may be electronic or
programmable/electronic (Hayes-compatible). Modem operations are discussed in
Chapter 6.
1-8
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Preparation for Use
Measurement Capabilities
1
Measurement Capabilities
Before scanning is enabled, the Data Bucket channels are configured for measuring the
selected electrical or physical parameter (volts dc, volts ac, temperature, etc.). Readings
have five digits of resolution, for example, 15.388 VAC. Scanning collects measurement
data, while the monitor mode can monitor a channel with or without scanning. The
review mode stores the maximum, minimum and last readings. Mx+B scaling and alarm
attributes can be applied to each configured channel. A totalizer channel is supplied as a
separate feature, and digital I/O functions are provided by the rear panel connectors,
ALARM OUTPUTS, and DIGITAL I/O.
Mx+B Scaling
The Mx+B scaling attribute allows readings to be modified to better represent what is
being measured. The M represents a multiplier and B represents an offset. For example,
a normal reading of 3 volts can be multiplied by M=+100 and offset by B=-25, to display
275 (3x100 - 25= 275). Mx+B scaling can be applied to any configured channel. This
feature is especially useful to scale transducer outputs for exact measurement displays.
Alarms
The alarms attribute allows readings that rise or fall below preset levels to alert the
operator and trigger an action. For example, if you are monitoring temperature and want
to have 100ºC cause an alarm condition, this can be programmed as part of the channel
configuration. Alarm conditions are reported as part of the measurement scan data and
can be used to trigger scanning and assert a logic low on a rear panel ALARM
OUTPUTS or DIGITAL I/O connector terminal for interface with external equipment.
Two alarms can be assigned to any configured channel. If Mx+B scaling is applied, the
alarms are based on the scaled values.
Totalizer Channel
The totalizer channel counts contact closures or voltage transitions. The maximum count
is 65,535. The connection is at the rear panel ALARMS OUTPUTS connector, terminals
SUM and GROUND. The Data Bucket continuously samples the totalizer input on the
rear panel, independently from Hydra's scanning and other activities.
Alarm Outputs and Digital I/O
Alarm outputs are available on the rear panel ALARM OUTPUTS and DIGITAL I/O
connectors. The four ALARM OUTPUT lines are permanently assigned to signal alarms
for channels 0, 1, 2, and 3. The eight DIGITAL I/O lines can be used to signal alarm
conditions for channels 4 to 20. All input/output lines are transistor-transistor-logic
(TTL) compatible. For operations that do not use a computer interface, these are the only
functions of the ALARM OUTPUTS and DIGITAL I/O connections. When a computer
interface is used, the DIGITAL I/O lines can be assigned in the applications software for
a variety of inputs or outputs. The ALARM OUTPUTS can also be assigned for I/O
operations if the dedicated alarm function is not used (which has priority).
Applications Software
PC applications software Hydra Starter (supplied) and Hydra Logger Package (Logger)
(optional) operate the instrument via the RS-232 computer interface. The software
packages are described in separate technical manuals; however, each is summarized
below.
1-9
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2635A
Users Manual
An extensive command set allows the user to develop custom software in GWBASIC,
QBASIC, and QuickC. The command set is discussed in Chapter 4.
Hydra Starter Package
Starter is a DOS based, menu-driven software package used to transfer configuration
data from and to the instrument, log measurement data collected by the instrument,
extract data from the memory card, and manage the acquired data. During operation,
Starter displays readings of all channels in real time and can automatically log the data to
a Lotus 1-2-3 compatible file.
Hydra Logger
Hydra Logger (model 2635A-901) is an optional Windows-based package that allows
complete setup, data collection and data conversion from up to two Hydra units. Logger
communicates over the RS-232 port on a personal computer and may be used with
telephone models. Hydra Logger with Trending (model 2635A-902) includes a
comprehensive trending package that simulates a chart recorder. A brochure with
complete details is available.
Options and Accessories
Options and accessories include measurement transducers, cables, applications software,
carrying case and other items, all of which are summarized in Table 1-2.
Memory Card Reader
Data Bucket measurement data and configuration setups may be stored on a memory
card that is inserted into the slot on the instrument front panel (see Figure 1-1). To
review and analyze the recorded data, the memory card data can be routed to a PC via
the RS-232 interface, or the memory card can be removed and taken to a PC equipped
with a memory card reader. The memory card reader (optional) is external to the PC and
connects to a PC parallel port (LPT1, LPT2, etc.). The memory card reader is configured
as another PC drive, e.g., the D: drive. Memory card files include data files
(dAtxx.HYD) and configuration setups (SEtxx.HYD). The PC manipulates these files
using applications software Starter (supplied) and Logger (optional). The selected
memory card reader must read SRAM cards and meet Personal Computer Memory Card
International Association (PCMCIA)/Japan Electronics Industrial Development
Association (JEIDA) standards. This memory card application meets PCMCIA standards
release 2.0.
Connector Set, 2620A-100
The 2620A-100 is a complete set of input connectors: one Universal Input Module, one
ALARM OUTPUTS connector, and one DIGITAL I/O connector. The use of additional
connector sets allows quick equipment interface to several wiring setups.
1-10
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Preparation for Use
Setting Up the Instrument
1
Table 1-2. Options and Accessories
DESCRIPTION
MODEL
2635A-901
Hydra Logger Software (Windows)
2635A-902
2640A-904
2620A-100
Hydra Logger Software with Trending (includes 2640A-904)
Trend Link for Fluke Software
I/O Connector Set; includes Universal Input Module, Digital I/O Connector and
Alarm Output Connector
2620A-101
10 Ohm Shunt Set (set of 12 shunts)
263XA-803
263XA-804
263XA-805
263XA-806
263XA-807
Memory Card Reader. Connects to PC parallel printer port
256Kb SRAM Memory Card (one included with instrument)
1Mb SRAM Memory Card
2Mb SRAM Memory Card
4Mb SRAM Memory Card
RS40
RS41
RS42
RS43
RS-232 Cable. DB9 to DB25
RS-232 Modem Cable. DB9 to DB25
RS-232 Printer Cable. DB9 to DB25
RS-232 Cable. DB9 to DB9
C40
Soft Carrying Case
Transit Case
C44
M00-200-634
26XXA-600
688868
Rackmount Kit
Portable Battery Pack
Hydra Series II Service Manual
Setting Up the Instrument
Setting up the instrument includes all preparatory information, from unpacking the
instrument to application of power.
Unpacking and Inspecting the Instrument
The following items are included in the shipping container:
•
•
•
•
•
•
Model 2635A Data Bucket instrument
This manual
Starter Applications software (floppy disks and manual)
Universal Input Module
ALARM OUTPUTS and DIGITAL I/O connectors
Channel 0 (front panel)TL70A test leads
1-11
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2635A
Users Manual
•
•
•
Line power cord
Type "T" Thermocouple
256K-byte Memory Card
Carefully remove the instrument from its shipping container and inspect the instrument
for possible damage or missing items. If the instrument is damaged or anything is
missing, contact the place of purchase immediately. Save the container and packing
material in case you have to return the instrument.
Rotate the rear feet of the instrument 180 degrees so that their support pads extend
slightly below the bottom of the case.
Adjusting the Handle
The handle can be positioned to four angles: one for carrying, two for viewing, and one
for handle removal. To change the angle, simultaneously pull both handle ends outward
to hard stops (about 1/4-inch on each side) and then rotate the handle to one of the four
stop positions shown in Figure 1-3. With the handle in the straight-up removal position,
you can disengage and free one handle side at a time.
2. Alternative Viewing Position
1. Viewing Position
Pull One End Out and Towards You.
Then Pull the Other End Out.
4. Removal Position
(to Remove, Pull Ends Out)
COM
V
Ω
3. Carrying Position
300V
MAX
op03f.eps
Figure 1-3. Adjusting the Handle
Connecting the Instrument to a Power Source
The instrument can be connected to an ac or dc source. Connections are shown in Figure
1-4 and described below.
1-12
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Preparation for Use
Setting Up the Instrument
1
LINE CORD (AC OPERATION)
FOR FIRE PROTECTION
REPLACE WITH T 1/8A 250V (SLOW) FUSE
CAUTION
MODEL: 2620A
5A
2635A
90-264V
50/60 Hz
15VA
!
IEC 664 INSTALLATIONCATEGORY II
ALARM OUTPUTS
DIGITAL I/O
RS-232C
IEEE STD-488 PORT
+ –
0
1
2
3
TR
0
1
2
3
4
5
6
7
Σ
9
5
8
7
6
1
4
3
2
+30V
!
9-16 V
DC PWR
SH1, AH1, T5, L4, SR1, RL1, DC1, DT1, PP0, C0, E1
MEETS Vfg. 243/1991
COMPLIES WITHFCC-15B
[DSR]
[RTS]
TX
[2635A ONLY] [CTS] DTR RX
GND
EXTERNAL BATTERY (DC OPERATION)
WARNING: If voltages greater than 30V are to be measured, a safety ground must be attached
to the rear panel ground connector when the instrument is operated from battery power.
op04f.eps
Figure 1-4. Connecting the Instrument to a Power Source
Warning
To avoid shock hazard, connect the instrument power cord to a
power receptacle with earth ground.
AC Operation
Plug the line cord into the connector on the rear of the instrument. The instrument
operates on any line voltage between 90 and 264V ac without adjustment, and at any
frequency between 45 and 440 Hz. However, the instrument is warranted to meet
published specifications only at 50 or 60 Hz.
DC Operation
The instrument may be operated from a DC voltage between 9 and 16 volts, consuming a
nominal 4 watts. Connection is made at the rear panel ALARM OUTPUTS connector,
pins (+) and (-). If both ac and dc sources are connected simultaneously, ac is used if it
exceeds approximately 8.3 times dc. Automatic switchover occurs between ac and dc
without interruption.
Warning
If voltages greater than 30V are to be measured, a safety
ground must be attached to the rear panel ground connector
when the instrument is operated from battery power.
Input Channels
The instrument provides one input (channel 0) on the front panel and 20 inputs (channels
1 through 20) through a connector on the rear panel. Channels 0, 1, and 11 can measure a
maximum of 300V dc or ac rms; all other channels can measure a maximum of 150V dc
or ac rms.
1-13
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2635A
Users Manual
Caution
Do not exceed the specified input voltage levels or equipment
damage could result.
Measurement Connections
W Warning
To avoid electric shock:
•
When the input module is installed, consider all channels
with connections as accessible terminals that may be
hazardous live.
•
Disconnect the input module before touching or changing
external wiring.
Input connections include the front panel terminals (channel 0), rear panel connections
using the Universal Input Module (channels 1 through 20), and I/O functions using the
ALARM OUTPUTS and DIGITAL I/O connectors. The instrument is protected from
channel configuration errors. For example, accidentally applying 300V ac to a channel
configured for resistance measurements will not damage the instrument.
Using Shielded Wiring
Shielded wires and sensors (such as thermocouples) should be used in environments
where "noisy" voltage sources are present. When shielded wiring is used, the shield is
normally connected to the L (low) input terminals for each channel. Alternate
configurations should be examined for each equipment application.
Crosstalk
The instrument allows the mixing of various types of measurement. A phenomenon
known as crosstalk can cause one signal to interfere with another and thereby introduce
measurement errors. To reduce the effects of crosstalk in making measurement
connections, do the following:
•
•
•
•
•
•
Keep any input wiring carrying ac volts signals physically separate from the input
wiring of other sensitive channels.
Avoid connecting inputs with ac volts signals adjacent to sensitive channel inputs.
Leave unconnected channels between the inputs, if possible.
Avoid connecting inputs with ac volts signals to any channel 10 numbers away from
a sensitive channel (i.e., 4-terminal input channels).
Avoid tying L (low) or (especially) H (high) inputs of a sensitive channel to earth
(chassis) ground. This is very important in resistance measurements.
Avoid high-source impedances on sensitive channels, or minimize the capacitance of
the sensitive channel to earth (chassis) ground for high impedance inputs.
Whenever high ohms measurements (>10 kΩ) must be made accurately, avoid
connecting any inputs carrying ac volts signals.
Measurement errors introduced by crosstalk are discussed in Appendix B.
Universal Input Module Connections
For channels 1 through 20, use the H (high) and L (low) inputs on the rear panel
Universal Input Module, as shown in Figure 1-5. Perform the following procedure to
make connections to the Universal Input Module:
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Preparation for Use
Measurement Connections
1
STRAIN RELIEF
11
12
13
14
15
16
17
18
19
20
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
1
2
3
4
5
6
7
8
9
10
op05f.eps
Figure 1-5. Universal Input Module Connections
Warning
Inputs may be connected to live voltages. To avoid electric
shock, remove inputs from live voltages before opening this
module.
1. Remove the module from the rear panel by pressing the release tab on the bottom of
the module and then pulling the module out of its connector.
2. Loosen the two large screws on top and open the module
3. Connect the wires to H (high) and L (low) for each channel.
4. Thread these wires through the strain-relief pins and out the back of the module.
5. Close the module cover, secure the screws, and insert the module in the connector at
the rear of the instrument until it latches in place.
Note
Channel 0 on the front panel does not support thermocouple
measurements.
Resistance and RTD measurements can be made with two terminals (one channel) or
four terminals (two channels). The four-terminal connection provides increased accuracy
(nominal 1%) over the two-terminal connection. Refer to Figure 1-6.
1-15
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2635A
Users Manual
2-WIRE (2T) CONNECTION
11 12 13 14 15 16 17 18 19 20
H L H L H L H L H L H L H L H L H L H L
SOURCE
(4-WIRE)
H L H L H L H L H L H L H L H L H L H L
SENSE
(4-WIRE)
1
2
3
4
5
6
7
8
9
10
RESISTANCE
OR
RTD SOURCE
USE H AND L TERMINALS FOR ANY CHANNEL.
• CHANNEL 0 ON FRONT PANEL
• CHANNELS 1 THROUGH 20 ON REAR
PANEL INPUT MODULE (CHANNEL 8 SHOWN HERE).
4-WIRE (4T) CONNECTION
11 12 13 14 15 16 17 18 19 20
H L H L H L H L H L H L H L H L H L H L
SOURCE
(4-WIRE)
H L H L H L H L H L H L H L H L H L H L
SENSE
(4-WIRE)
1
2
3
4
5
6
7
8
9
10
RESISTANCE
OR
RTD SOURCE
USE H AND L TERMINALS FOR TWO CHANNELS ON REAR PANEL INPUT MODULE.
CONNECTIONS FOR CHANNEL 8 ARE SHOWN HERE WITH CHANNEL 18 PROVIDING
THE ADDITIONAL TWO CONNECTIONS.
FOR EACH 4-WIRE CONNECTION, ONE SENSE CHANNEL (1 THROUGH 10) AND
ONE SOURCE CHANNEL (SENSE CHANNEL NUMBER +10 = 11 THROUGH 20) ARE USED.
op06f.eps
Figure 1-6. Two-Terminal and Four-Terminal Connections
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Preparation for Use
Measurement Connections
1
Alarm Outputs Connections
The eight-terminal rear panel ALARM OUTPUTS connector (Figure 1-7) serves three
functions: DC power, alarm outputs, and external trigger input. Each is described below.
Terminal
Function
ALARM OUTPUTS
+
–
0
1
2
3
TR
Positive Input for DC Operation
Negative Input for DC Operation
Channel 0 Alarm Output
Channel 1 Alarm Output
Channel 2 Alarm Output
Channel 3 Alarm Output
External Trigger Input
+ – 0 1 2 3 TR
9-16 V
DC PWR
Ground Terminal
op07f.eps
Figure 1-7. ALARM OUTPUTS connector
DC Power
The instrument may be powered by a dc input between 9 volts and 16 volts allowing
remote operation from various battery sources or dc power supplies. Connect the
positive lead of the power supply to the + terminal and the negative lead to the -
terminal. If the instrument is going to measure voltages greater than 50 volts dc or ac
rms, also connect a ground wire between the rear panel ground lug and a suitable earth
(safety) ground point (see Figure 1-4).
Alarm Outputs
Terminals 0, 1, 2, and 3 are used to signal alarm conditions for channels 0, 1, 2, and 3
respectively using transistor-transistor-logic (TTL) voltage levels, referenced to the
GROUND terminal. Logic high is >+2.0 to <+5.5V dc; a logic low is 0.0 to +0.8V dc. If
a channel is not in alarm, the voltage output at a connector terminal is a logical high
(nominal +5V dc); if a channel is in alarm, the output is a logical low (nominal +0.7V
dc). Alarm outputs are set at the end of a scan interval. See Setting the Alarms in
Chapter 2 for more information. If the instrument is operated over the RS-232 computer
interface, the ALARM OUTPUTS can be assigned to I/O functions (assuming channels
0, 1, 2, and 3 are not configured for alarms). See the ALARM_DO_LEVEL command,
described in Chapter 4.
External Trigger Input
An external trigger input can serve the same function as the front panel SCAN key. A
contact closure between TR and GROUND or a TTL logical low applied to TR
(referenced to GROUND), will cause the instrument to scan. When the trigger input is
removed, scanning will stop. Scanning is initiated on the falling edge of the trigger
signal, which must be held logic low for at least 5 us and have been preceded by at least
100 ms of logic high. Logic high is +2.0 to +7.0V dc; a logic low is -0.6 to +0.8V dc.
See "Scan Triggering Options" in Chapter 2 for more information.
Perform the following procedure to make connections to the ALARM OUTPUTS
connector:
1. Remove the connector from the rear panel.
1-17
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2. Loosen the wire clamp screw for the associated terminal.
3. Feed the wire into the gap between the connector body and the wire clamp.
4. Tighten the wire clamp screw.
5. Insert the connector in the rear panel.
Digital I/O Connections
The ten-terminal rear panel DIGITAL I/O connector (Figure 1-8) serves two functions:
Digital I/O and Totalizer input. Each is described below.
Terminal
Function
DIGITAL I/O
0
1
2
3
4
5
6
7
Σ
Input/Output Line 0
Input/Output Line 1
Input/Output Line 2
Input/Output Line 3
Input/Output Line 4
Input/Output Line 5
Input/Output Line 6
Input/Output Line 7
Totalizer Input
0 1 2 3 4 5 6 7
Σ
Ground Terminal
op08f.eps
Figure 1-8. DIGITAL I/O Connector
Digital I/O
Terminals 4 through 7 are used to signal alarm conditions for channels 4 through 20
(default setting) using TTL voltage levels, referenced to the GROUND terminal. Logic
high is >+2.0 to <+5.5V dc; a logic low is 0.0 to +0.8V dc. If a channel is not in alarm,
the voltage output at a connector terminal is a logical high (nominal +5V dc); if a
channel is in alarm, the output is a logical low (nominal +0.7V dc). Alarm outputs are
changed at the end of each scan. See "Setting the Alarms" in Chapter 2 for more
information. All alarm associations can be removed using computer commands, allowing
the I/O terminals to be assigned to other functions as determined by computer
commands. See the ALARM_ASSOC_CLR and related commands, described in Chapter
4.
Totalizer Input
The totalizer is an internal counter that sums contact closures or voltage transitions.
Connection is to the SUM terminal, referenced to GROUND. A contact closure and
opening, or a voltage transition rising edge will cause the totalizer to advance by one
count. The maximum count allowed is 65535 and the maximum count rate is 5 kHz.
Voltages trigger on a low-to-high transition at a nominal threshold of +1.4 volts. A
contact debounce feature is available when the instrument is operated through the RS-
232 computer interface using the TOTAL_DBNC command, described in Chapter 4.
Perform the following procedure to make connections to the DIGITAL I/O connector:
1. Remove the connector from the rear panel.
2. Loosen the wire clamp screw for the associated terminal.
3. Feed the wire into the gap between the connector body and the wire clamp.
1-18
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Preparation for Use
Controls and Indicators
1
4. Tighten the wire clamp screw.
5. Insert the connector in the rear panel.
Controls and Indicators
The front panel (Figure 1-1) provides a multipurpose display and a set of control keys.
Each is described in the following paragraphs.
Front Panel Controls
The front panel keys (Figure 1-9) control all instrument operation: channel
configuration, instrument configuration, measurement functions, and
print/communications selections. Table 1-3 provides a summary of front panel key
functions.
Front Panel Indicators
The front panel indicators are divided into three portions: Primary Display (Figure 1-10),
Secondary Display (Figure 1-11), and Display Annunciators (Figure 1-12). Table 1-4
describes each annunciator function.
INTVL
FILES
REVIEW
FUNC
ALRM
SCAN
CLOCK
MODE
CLEAR
SINGLE
RATE
ENTER
+
CANCL
Mx B
MON
SHIFT
LIST
TOTAL
LOCAL
COMM
ZERO
TRIGS
BUSY BATT
op09f.eps
Figure 1-9. Front Panel Keys
FUNC
F
SET
Mx+B
MAX REM SCAN
MIN AUTO MON
REVIEW
LAST
ALARM
°C °F RO
PRN CH
EXT TR
OFF
CAL
mV AC DC
LIMIT
1 2
HI
LO
x1Mk
Ω
Hz
op10f.eps
Figure 1-10. Primary Display
1-19
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FUNC
F
SET
Mx+B
MAX REM SCAN
MIN AUTO MON
REVIEW
LAST
ALARM
°C °F RO
PRN CH
EXT TR
OFF
CAL
mV AC DC LIMIT HI
x1Mk Hz
Ω
1 2 LO
op11f.eps
Figure 1-11. Secondary Display
FUNC
F
SET
Mx+B
MAX REM SCAN
MIN AUTO MON
REVIEW
LAST
ALARM
°C °F RO
PRN CH
EXT TR
OFF
CAL
mV AC DC LIMIT HI
x1Mk Ω Hz
1 2 LO
op12f.eps
Figure 1-12. Annunciator Display
1-20
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Preparation for Use
Controls and Indicators
1
Table 1-3. Front Panel Keys Description
Description
Key
F
A
B
C
Calls up the menu to set the function for the channel
Calls up the menu to set alarm limits Sand Tfor the channel.
Calls up the menu to set scaling on the channel.
Used to exit any setup menu and return to Inactive Mode, without saving
settings you’ve selected thus far. Exceptions exist under the following two
conditions
If you cancel out of the alarm menu part way through defining alarm limit T, any
just-made entries for alarm limit Swill still take effect.
If you cancel out of the Mx+B menu part way through defining the B value, any
just-made entries for the M value will still take effect.
This key also provides a handy way to remove the Totalizer value or Review
data from the display.
G D
J H
Used to change the channel number and to step through choices in any of the
setup menus. These arrow keys have an automatic repeat action when held
down for more than 1 second.
Used to step through choices in several of the setup menus. These arrow keys
have an automatic repeat action when held down for more than 1 second.
E
I
Used to accept a selection just made in any setup menu.
Allows you to change the scan interval. Scanning becomes continuous when
the interval is set to 0:00:00.
P
Accesses menus related to memory card operation, including status, directory,
and manipulation of all SEtxx and dAtxx files.
N
K
Calls up the Review array of MIN, MAX and LAST values to the display.
Accesses secondary functions under various keys, as described below. When
this key is pressed, "SHIFt" appears on the right display, but automatically
disappears if you have not made a selection within 5 seconds or press C.
L
Prints out the Last values of the Review array or contents of the memory card
directory via the RS-232 computer interface.
O
Q
Calls up the present Totalizer count to the display.
Turns the Scan function on or off.
Triggers a single scan when the instrument is under remote control without
lockout (REMS).
M
Turns the Monitor function on or off
RATE K J
Allows you to change the scanning speed: “Slo” for highest accuracy, or “FASt”
for highest throughput
CLOCK K I
MODE K P
Allows you to set the internal day/date clock
Allows you to select the destination and conditions for which scan
measurements will be automatically printed or logged.
1-21
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Table 1-3. Front Panel Keys Description (cont.)
Description
Key
CLEAR
K N
This key sequence clears the entire contents of the Review array. Review data
must be presently shown on the display to clear the array.
LOCAL K
When under remote control without lockout (REMS), this returns control to the
front panel.
COMM K L
Allows you to set up the computer interface port.
ZERO
K O
While the Totalizer count is displayed, resets the Totalizer to 0.
SINGLE K Q
Forces an immediate scan of all defined channels. If a scan is presently in
progress, this new request is ignored. Once begun, the full scan is completed.
Configuration changes are not allowed while a scan is in progress.
Table 1-4. Annunciator Descriptions
Description
Annunciator
MON
Indicates that the Monitor function is enabled.
SCAN
Indicates that the Scan function is enabled. Scanning can be enabled as a single scan
(KQ), with a scan interval, with an alarm-trigger or with an external trigger.
CH
Indicates that the channel number is displayed immediately above, in the right display.
Lit when the instrument is in Configuration Mode.
SET
Mx+B
Lit while Mx+B scaling is being defined and when a measurement on the display has
been scaled with an M value other than 1 and/or a B value other than 0 has been
defined for this channel.
FUNC
Lit when a measurement function is being defined for this channel.
ALARM
Lit when alarm values are being defined for this channel or when an alarm limit has
been exceeded while measuring.
v
Indicates that the measurement function is volts for this channel (used with the AC or
DC annunciator).
DC
AC
e
Indicates that the measurement function is dc voltage for this channel.
Indicates that the measurement function is ac voltage for this channel.
Indicates that the measurement function is resistance for this channel.
Indicates that the measurement function is frequency for this channel.
Hz
°C
Indicates that the measurement function is temperature for this channel and that the
degree unit is Celsius.
°F
m
x1
k
Indicates that the measurement function is temperature for this channel and that the
degree unit is Fahrenheit.
(milli) a multiplier for the displayed value, e.g., mV for millivolts. Also used when defining
alarm and Mx+B values.
(times 1) a multiplier for the displayed value. Used when defining alarm and Mx+B
values.
(kilo) a multiplier for the displayed value, e.g., kHz for kilohertz. Also used when defining
alarm and Mx+B values.
1-22
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Preparation for Use
Controls and Indicators
1
Table 1-4. Annunciator Descriptions (cont)
Description
Annunciator
M
(mega) a multiplier for the displayed value, e.g., M½ for megohms. Also used when
defining alarm and Mx+B values.
R0
Lit when the ice point resistance is being defined for RTD measurements on the
displayed channel.
OFF
Indicates there is no measurement function defined for the displayed channel; OFF
channels are skipped over when scanning. OFF is also used when defining an alarm
value to indicate that the alarm limit is to be ignored.
AUTO
LIMIT
Indicates that autoranging is enabled for the displayed channel.
Used with the [1] and [2] annunciators when you are setting an alarm limit value. Also lit
when displaying a measurement value (LAST, Monitor) which has exceeded an alarm
limit.
1
Lit when alarm limit 1 is being defined. Also lit when displaying a measurement value
(LAST, Monitor) which has exceeded alarm limit 1.
2
Lit when alarm limit 2 is being defined. Also lit when displaying a measurement value
(LAST, Monitor) which has exceeded alarm limit 2.
HI, LO
REVIEW
MIN, MAX
LAST
PRN
Identifies alarm limit sensing (high or low) during channel configuration. At other times,
identifies an alarm condition.
Indicates that review data is being displayed (used in conjunction with the MIN, MAX,
and LAST annunciators).
Indicates that the displayed value is the minimum (maximum) value measured on this
channel.
Indicates that the displayed value is the most recent scan measurement taken on this
channel.
Indicates that the autoprint function is enabled (to send readings to a printer or PC) or
the memory storage function is on (to store readings in a memory card).
EXT
TR
Indicates that external triggering (on the rear panel) is enabled.
Indicates that internal triggering (from the monitor alarm) is enabled. Also used with EXT
when external triggering is enabled.
REM
Indicates that the instrument is under the control of the RS-232 computer interface
(bright) or a front panel lockout option has been enabled (dim).
CAL
F
Indicates that the instrument's internal calibration constants have been corrupted.
(Not Used)
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Chapter 2
Front Panel Operations
Title
Page
Summary of Front Panel Operations................................................................. 2-5
Configuring the Instrument for Operation......................................................... 2-6
Turning the Power on.................................................................................... 2-6
Selecting a Channel....................................................................................... 2-8
Configuring a Measurement Channel................................................................ 2-8
Thermocouples ......................................................................................... 2-13
Thermocouple Restrictions:...................................................................... 2-13
Configuring a Channel Off ........................................................................... 2-16
Setting Operating Conditions............................................................................ 2-16
Setting the Scan Interval ............................................................................... 2-17
Setting the Measurement Rate ...................................................................... 2-18
Setting the Alarms......................................................................................... 2-18
Alarms and Autoprinting.......................................................................... 2-20
Alarms and Mx+B Scaling ....................................................................... 2-20
Setting the Mx+B Scaling............................................................................. 2-23
Examples................................................................................................... 2-23
Restrictions ............................................................................................... 2-23
Operating Modes ............................................................................................... 2-26
Using the Scan Mode .................................................................................... 2-26
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Memory Card Formatting......................................................................... 2-26
Memory Card Capacity............................................................................. 2-26
Memory Card Files................................................................................... 2-26
Memory Card Error Messages ...................................................................... 2-28
Using the Monitor Mode............................................................................... 2-29
Using the Review Mode................................................................................ 2-30
Additional Features ........................................................................................... 2-31
Scan Triggering Options ............................................................................... 2-31
External Trigger........................................................................................ 2-31
Monitor-Alarm Trigger............................................................................. 2-31
Totalizer Operation ....................................................................................... 2-32
Digital Input/output Lines............................................................................. 2-33
Setting Date and Time................................................................................... 2-34
Returning to the Local Mode ........................................................................ 2-35
Front Panel Key Lockout Options ................................................................ 2-36
Instrument Interfaces......................................................................................... 2-36
Memory Card Interface................................................................................. 2-36
RS-232 Computer Interface .......................................................................... 2-37
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Front Panel Operations
Summary of Front Panel Operations
2
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2635A
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HYDRA DATA BUCKET
REVIEW
LAST
mA
mVDCAC
CH
k
Hz
COM
V
INTVL
FILES
MODE
REVIEW
CLEAR
SCAN
FUNC
Mx+B
ALRM
300V
MAX
CLOCK
RATE
SINGLE
MON
CANCEL
ENTER
SHIFT
LIST
TOTAL
ZERO
LOCAL
COMM
TRIGS
BUSY BATT
op92f.eps
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Front Panel Operations
Summary of Front Panel Operations
2
Summary of Front Panel Operations
Descriptions of all equipment operations start at the front panel and proceed through the
following topics, which appear in the following sequence:
•
•
•
•
•
•
Preparing for Operation
Configuring a Measurement Channel
Setting Operating Conditions
Operating Modes
Additional Features
Instrument Interfaces
This chapter applies exclusively to instrument applications that use only the front panel
controls and annunciators. Other chapters apply specifically to applications that use the
memory card feature or interface with a computer, printer, or modem. It is assumed that
the user has understood the information in Chapter 1, "Preparation for Use," including
such topics as setting up the instrument and making measurement connections. Perform
the Ten-Minute Tour at the front of this manual for a quick overview of instrument
operation.
All the procedures in this chapter use control/annunciator diagrams that provide the
control sequences and expected indicators for each operation. A summary of how to use
the control/annunciator diagrams is shown in Figure 2-1.
Press then release the
The shaded portion above
a menu indicates a front
panel display for that
menu. In this example,
the menu is called SET
FUNC.
SET FUNC
FUNC
front panel key shown. In
this example, press the
FUNC key
OFF
°F
Hz
Ω
VAC
Use the up/down arrow
keys to select an item from
the displayed menu.
A solid pointer means the
menu selection is required.
In this example, °F must
be selected.
V DC
When the menu item
selected with the up/down
arrow keys is correct,
press the ENTER key.
ENTER
SET FUNC
A dotted arrow means the
menu selection is typical
and the user must choose
the item that meets the
instrument application. In
J
K
E
T
N
R
S
b
When there are multiple
selections, the procedure
will continue.
this example,
a
typical
choice is thermocouple T.
ENTER
C
Pt
A dotted pointer indicates
a typical menu selection,
while
indicates
selection.
a
solid pointer
required
A procedure that includes
an audible "beep" will use
a beep symbol as shown.
Typical
Required
= "Beep"
a
op13f.eps
Figure 2-1. How to use the Control/Annunciator Diagrams
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Configuring the Instrument for Operation
To prepare the equipment for front panel operations, perform the two following
procedures:
•
•
Turning the Power On (Figure 2-2)
Selecting a Channel (Figure 2-3)
Turning the Power on
There are four power-on options. Figure 2-2 describes the control sequences for each
option.
Each power-on sequence includes a four-second selftest routine that lights the front
panel display. If the selftest fails, the instrument will beep and display ERROR plus an
alphanumeric error code character (see Table 2-2). If there is more than one error, each
is displayed in sequence at two-second intervals. Refer to the maintenance information
in Chapter 7 for guidance on what to do when an error is detected.
Simple Power-On. Press the POWER switch.
POWER
(Selftest)
Error
After selftest, the display clears and the
instrument resumes whatever operation was in
effect when power was last removed.
Configuration-Reset Power-On. Hold down the
CANCL key and press the POWER switch. Hold
the CANCL key until the instrument completes
selftest and "beeps" in acknowledgement. All
channel configuration data is erased and the
operating parameters are set to default settings
(see Table 2-1). The temperature scale and
communication settings are not affected.
(Selftest)
Error
CANCL
+
POWER
Display-Hold Power-On. Hold down the SHIFT
key and press the POWER switch. Hold the
SHIFT key until the instrument completes the
selftest routine and "beeps" in acknowledgement.
The front panel display will remain lit until any key
is pressed.
(Selftest)
Error
SHIFT
+
POWER
Temperature-Toggle Power-On. Hold down the
Mx+B key and press the POWER switch. Hold
the Mx+B key until the instrument completes
selftest, "beeps" in acknowledgement, displaying
either °F or °C. To select the other temperature
scale, remove power and repeat the procedure.
(Selftest)
Error
Mx+B
+
POWER
op14f.eps
Figure 2-2. Turning the Power On
2-6
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Front Panel Operations
Configuring the Instrument for Operation
2
Table 2-1. Configuration Reset (Default) Settings
Parameter Default Setting
Channels 0 to 20
Off
Measurement Rate
Mx+B Scaling
Slow
1x+0 (all channels)
Scan Interval
0:00:00 (continuous)
Cleared (all channels)
Set High (non-alarm)
0/Debounce Disabled
None
Review Values
Digital I/O Lines
Totalizer
Destination
RTD R0
100.00 (all channels)
Enabled
Open Thermocouple Detection (OTC)
Alarm Limits
Off/Limit Values=0
Alarm Assignments
Channels 0 to 3, to ALARM OUTPUTS 0 to 3.
Channels 4 to 20, to DIGITAL I/O as below:
DIGITAL I/O LINE
4
5
6
7
Alarm Channel
(ORed to drive
each I/O line)
4
8
5
9
6
7
10 11
12 13 14 15
16 17 18 19
20
Table 2-2. Selftest Error Codes
Code
Description
1
2
3
5
6
7
8
9
A
b
C
d
Boot ROM Checksum Error
Instrument ROM Checksum Error
Internal RAM Test Failed
Display Power-Up Test Failed
Display Not Responding
Instrument Configuration Corrupted
Instrument Not Calibrated
A-to-D Converter Not Responding
A-to-D Converter ROM Test Failed
A-to-D Converter RAM Test Failed
A-to-D Converter Selftest Failure
Memory Card Interface Not Installed
2-7
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2635A
Users Manual
Selecting a Channel
There are 21 channels, 0 to 20. A channel is selected for configuration or configuration
verification when the instrument is in the inactive mode. An active channel is selected
for monitoring when the instrument is in the Monitor Mode (see Figure 2-17) or Review
Mode (see Figure 2-18). Perform the procedure in Figure 2-3 to select a channel.
Restrictions
Locked Out Channels. Any channel 1 to 10 (n) assigned to four-terminal (4T)
measurements locks out a corresponding channel a decade higher (n+10). For example,
use of channel 3 for 4T measurements locks out channel 13, which can be selected, but
not configured.
Restricted Channels. Channel 0 (front panel terminals) does not support thermocouple
measurements or four-terminal measurements.
Selecting a Channel. Press the up/down arrow
keys until the CH (Channel) display shows the
CH
20
19
18
17
16
15
14
13
12
11
10
9
desired channel, for example, CH 12 (Channel
12).
8
7
6
5
4
3
2
Typical
1
0
Required
op15f.eps
Figure 2-3. Selecting a Channel
Configuring a Measurement Channel
The following paragraphs provide configuration procedures for DC Volts, AC Volts,
Resistance, Frequency, Temperature, and describe how to turn a channel Off:
•
•
•
•
Configuring a Channel to Measure DC Volts (Figure 2-4)
Configuring a Channel to Measure AC Volts (Figure 2-5)
Configuring a Channel to Measure Resistance (Figure 2-6)
Configuring a Channel to Measure Frequency (Figure 2-7)
2-8
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Front Panel Operations
Configuring a Measurement Channel
2
•
•
•
Configuring a Channel to Measure Temperature (Thermocouples) (Figure 2-8)
Configuring a Channel to Measure Temperature (RTDs) (Figure 2-9)
Configuring a Channel Off (Figure 2-10)
The instrument is protected from channel configuration errors. For example, accidentally
applying 300V ac to a channel configured for resistance will not damage the instrument.
Configuring a Channel to Measure DC Volts
Perform the procedure in Figure 2-4 to configure a channel for measuring dc volts. In
preparation, the instrument must be in the inactive mode (not scanning or monitoring)
and the desired channel must be selected (see Figure 2-3). To exit at any time (changes
not saved), press the C key.
Restrictions
Maximum Input. The maximum voltage inputs are 300V dc for channels 0, 1, 11, and
150V dc for channels 2 to 10, and 12 to 20.
90.000 mV Range. Not used in Auto (autoranging).
Selecting the DC Volts Mode. Press the FUNC
SET FUNC
FUNC
key to access the SET FUNC (Set Function)
menu. Press the up/down arrow keys until V DC
(volts dc) is displayed, then press the ENTER
key.
OFF
°F [°C]*
Hz
Ω
VAC
V DC
ENTER
Selecting the Measurement Scale. Select a
fixed scale or Auto (autoranging). A fixed scale
SET FUNC
Auto
indicates an upper measurement limit.
For
300.00 V **
150.00 V ***
30.000 V
3.0000 V
300.00 mV
90.000 mV
example, the 30.000 V scale measures 30 volts
or less. Measurements beyond the scale limit will
cause an OL (overload) display. The x1 (1.0)
multiplier indicates a reading in volts dc; the m
multiplier (0.001) indicates a reading in millivolts
dc. A 900.00 mV range is available by computer
interface and may appear in the display if this
was previously selected.
ENTER
Typical
Required
In Auto (autoranging), the instrument chooses the
scale for the best measurement resolution.
When the scales are changed, the scan is
momentarily slowed.
* Depends on temperature scale.
** Channels 0, 1, and 11.
*** Channels 2 to 10, and 12 to 20.
op16f.eps
Figure 2-4. Configuring a Channel to Measure DC Volts
2-9
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2635A
Users Manual
Configuring a Channel to Measure AC Volts
Perform the procedure in Figure 2-5 to configure a channel for measuring ac volts. In
preparation, the instrument must be in the inactive mode (not scanning or monitoring)
and the desired channel must be selected (see Figure 2-3). To exit at any time (changes
not saved), press the C key.
Restrictions
Maximum Input. The maximum voltage inputs are 300V ac (rms) for channels 0, 1, 11,
and 150V ac (rms) for channels 2 to 10, and 12 to 20.
Frequency. The frequency range for maximum voltage inputs is 20 Hz to 100 Hz. Refer
to Appendix A for derated voltage inputs for frequencies between 100 Hz and 100 kHz.
Selecting the AC Volts Mode. Press the FUNC
SET FUNC
FUNC
key to access the SET FUNC (Set Function)
menu. Press the up/down arrow keys until VAC
(Volts AC) is displayed, then press the ENTER
key.
OFF
°F [°C]*
Hz
Ω
VAC
V DC
ENTER
Selecting the Measurement Scale. Select a
fixed scale or Auto (autoranging). A fixed scale
SET FUNC
Auto
indicates an upper measurement limit.
For
300.00 V **
150.00 V ***
30.000 V
3.0000 V
300.00 mV
example, the 30.000 V scale measures 30 volts
or less. Measurements beyond the scale limit will
cause an OL (overload) display. The x1 (unity or
x 1) multiplier indicates a reading in volts ac; the
m (milli or x .001) multiplier indicates a reading in
millivolts ac.
ENTER
* Depends on
temperature scale.
In Auto (autoranging), the instrument chooses the
scale for the best measurement resolution.
When the scales are changed, the scan is
momentarily slowed.
** Channels 0, 1,
and 11.
Typical
Required
*** Channels 2 to
10, and 12 to 20.
op17f.eps
Figure 2-5. Configuring a Channel to Measure AC Volts
2-10
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Front Panel Operations
Configuring a Measurement Channel
2
Configuring a Channel to Measure Resistance
Perform the procedure in Figure 2-6 to configure a channel for measuring resistance. In
preparation, the instrument must be in the inactive mode (not scanning or monitoring)
and the desired channel must be selected (see Figure 2-3). To exit at any time (changes
not saved), press the C key.
The resistance to be measured can be connected using one channel (two-terminal
connection) or two channels (four-terminal connection). The four-terminal connection
provides increased measurement precision. The two channels used in a four-terminal
connection are a decade apart (n and n+10), for example, channel 3 (n) and 13 (n+10).
Only the lower channel is configured.
Restrictions
Four-Terminal Channels. Four-Terminal configurations are limited to channels 1 to 10
(n). The channel a decade higher (n + 10) is automatically reserved for use.
Selecting the Resistance Mode. Press the
SET FUNC
FUNC
FUNC key to access the SET FUNC (Set
Function) menu. Press the up/down arrow keys
until Ω (ohms) is displayed, then press the
ENTER key.
OFF
°F [°C]*
Hz
Ω
VAC
V DC
ENTER
Selecting the Measurement Scale. Select a
fixed scale or Auto (autoranging). A fixed scale
indicates an upper measurement limit. For
example, the 30.000 kΩ scale measures 30 kΩ
ohms or less. Measurements beyond the scale
limit will cause an OL (overload) display. The x1
(unity or x 1) multiplier indicates a reading in
ohms; the k (kilo or x 1,000) multiplier indicates a
reading in kilohms; the M (mega or x 1,000,000)
multiplier indicates a reading in megohms.
SET FUNC
Auto
10.000 M
3.0000 M
300.00 k
30.000 k
3.0000 k
300.00
ENTER
* Depends on
temperature scale.
In Auto (autoranging), the instrument chooses the
scale for the best measurement resolution.
When scales are changed, the scan is
momentarily slowed.
** Channels 1 to 10.
Selecting the Terminal Mode. Select the two-
terminal (2T) or four-terminal (4T) mode. 4T
automatically clears configuration data from the
channel a decade higher (n+10). For example,
SET FUNC
2T
4T**
selecting channel
automatically clear channel 13 of all configuration
data and lock it out from further use.
3
for 4T operation will
Typical
Required
ENTER
op18f.eps
Figure 2-6. Configuring a Channel to Measure Resistance
2-11
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2635A
Users Manual
Configuring a Channel to Measure Frequency
Perform the procedure in Figure 2-7 to configure a channel for measuring frequency. In
preparation, the instrument must be in the inactive mode (not scanning or monitoring)
and the desired channel must be selected (see Figure 2-3). To exit at any time (changes
not saved), press the C key.
Restrictions
Frequency Range. The frequency range for measurements is 15 Hz minimum to greater
than 1 MHz.
Maximum Input. The maximum voltage inputs are 300V ac (rms) for channels 0, 1, 11,
and 150V ac (rms) for channels 2 to 10, and 12 to 20. The frequency range for maximum
voltage inputs is 15 Hz to 100 Hz. Refer to Appendix A for derated voltage inputs for
frequencies between 100 Hz and 100 kHz.
Selecting the Frequency Mode. Press the
SET FUNC
FUNC
FUNC key to access the SET FUNC (Set
Function) menu. Press the up/down arrow keys
until Hz (Hertz) is displayed, then press the
ENTER key.
OFF
°F [°C]*
Hz
Ω
VAC
V DC
ENTER
Selecting the Measurement Scale. Select a
fixed scale or Auto (autoranging). A fixed scale
SET FUNC
Auto
indicates an upper measurement limit.
For
1.0000 MHz
900.00 kHz
90.000 kHz
9.0000 kHz
900.00 Hz
example, the 90.000 kHz scale measures 90 kHz
or less. Measurements beyond the scale limit will
cause an OL (overload) display. The x1 (unity or
x 1) multiplier indicates a reading in Hz; the k
(kilo or x 1,000) multiplier indicates a reading in
kilohertz; the M (mega or x 1,000,000) multiplier
indicates a reading in megahertz.
ENTER
Typical
In Auto (autoranging), the instrument chooses the
scale for the best measurement resolution.
There are no scanning delays with frequency
autoranging.
Required
* Depends on
temperature scale.
op19f.eps
Figure 2-7. Configuring a Channel to Measure Frequency
2-12
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Front Panel Operations
Configuring a Measurement Channel
2
Configuring a Channel to Measure Temperature
Perform the procedure in Figure 2-8 to configure a channel for measuring temperature
with thermocouples, or Figure 2-9 to measure temperature with resistance-temperature
detectors (RTDs). In preparation, the instrument must be in the inactive mode (not
scanning or monitoring) and the desired channel must be selected (see Figure 2-3). To
exit at any time (changes not saved), press the C key. The temperature scale, ºC or ºF,
is set by the Temperature-Toggle Power-On procedure (see Figure 2-2). When under
computer control, an open thermocouple default can be set by the TEMP_CONFIG
command.
Thermocouples
Thermocouples are formed by joining two wires of dissimilar metals, which produce a
voltage proportional to the temperature of the wire junction. The instrument conditions
this voltage into temperature measurements. Voltage conditioning includes
compensation for the type of thermocouple used and measurement-process
compensation that uses a reference temperature sensor built into the Input Module
(channels 1 to 20). The front panel terminals (channel 0) cannot be used for
thermocouples. The instrument supports nine standard thermocouples, each identified
with an American National Standards Institute (ANSI) alpha character (except [ ]): J,
[C], B, S, R, N, T, E, or K. A thermocouple type is selected as part of the channel
configuration. Table 2-3 summarizes the ranges and characteristics of the supported
thermocouples. The instrument displays "otc" when an open thermocouple is detected
(as selected with the TEMP_CONFIG command - see Chapter 4). A type "T"
thermocouple is supplied with the instrument.
Resistance-Temperature Detectors
Resistance-Temperature Detectors (RTDs) are formed from coils or strips of metal,
usually platinum, the resistance of which varies with temperature. The instrument
conditions this resistance into temperature measurements. The instrument supports any
platinum RTD that is calibrated to the IEC 751 Standard (a=0.00385 ohms/ohm/ºC).
RTDs are characterized by their resistance at 0 ºC, which is called the "ice point" or R0.
The most common R0 is 100 ohms. The instrument supports any IEC 751 Platinum RTD
with an R0 from 000.00 to 999.99, with a default of R0=100.00. Since RTDs are
resistance devices, they can be connected to the instrument using one channel (two-
terminal connection) or two channels (four-terminal connection). A four-channel
configuration provides increased measurement precision. Some RTDs can be purchased
in a four-terminal configuration, facilitating a four-terminal connection. The two
channels used in a four-terminal connection are a decade apart (n and n+10), for
example, channel 3 (n) and 13 (n+10). Only the lower channel is configured.
Thermocouple Restrictions:
Channel 0. Thermocouple measurements cannot use channel 0.
Open Thermocouple. The instrument displays OTC when an open thermocouple is
detected and ignores the channel while scanning.
Resistance Temperature Detectors Restrictions:
Four-Terminal Channels. Four-Terminal configurations are limited to channels 1 to 10
(n). The channel a decade higher (n + 10) is automatically reserved for use.
2-13
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2635A
Users Manual
Table 2-3. Thermocouple Ranges
Positive Lead
Negative Lead
Material
Constantan
Usable
(H) Color
Range (°C)
Type
Material
ANSI*
IEC**
J
Iron
White
White
Gray
Black
-200 to 760
0 to 2316
C***
b
Tungsten (5% Rhenium)
Platinum (30% Rhodium)
Platinum
Tungsten (26% Rhenium)
Platinum (6% Rhodium)
Platinum (10% Rhodium)
0 to 1820
S
Black
Orang
-50 to 1768
e
R
N
Platinum
Black
Orang
e
Platinum (13% Rhodium)
NISIL
-50 to 1768
NICROSIL
Orang
e
-270 to 1300
T
E
K
Copper
Chromel
Chromel
Blue
Brown
Violet
Green
Constantan
Constantan
Alumel
-270 to 400
-270 to 1000
-270 to 1372
Purple
Yellow
* American National Standards Institute (ANSI) device negative lead (L) is always red.
** International Electrotechnical Commission (IEC) device negative lead (L) is always white.
*** Not an ANSI designation but a Hoskins Engineering Company designation.
Selecting the Temperature Mode. Press the
FUNC key to access the SET FUNC (Set
Function) menu. Press the up/down arrow keys
until °C (Centigrade) or °F (Fahrenheit) is
displayed, then press the ENTER key. (If the
opposite temperature scale is desired, refer to
Figure 2-2.)
SET FUNC
FUNC
ENTER
ENTER
OFF
°F [°C]*
Hz
Ω
VAC
V DC
Selecting the Type of Thermocouple. Select
the desired type of thermocouple from the menu,
for example, T, then press ENTER. The "Pt"
(Platinum) setting is used for RTDs only (See
Figure 2-9).
SET FUNC
J
K
E
T
N
R
S
* Depends on
temperature scale.
b
** Only Pt can be
selected for Channel 0.
C
Pt**
Typical
Required
op20f.eps
Figure 2-8. Configuring a Channel to Measure Temperature (Thermocouples)
2-14
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Front Panel Operations
Configuring a Measurement Channel
2
Selecting the Temperature Mode. Press the
SET FUNC
FUNC
FUNC key to access the SET FUNC (Set
Function) menu. Press the up/down arrow keys
until °C (Centigrade) or °F (Fahrenheit) is
displayed, then press the ENTER key. (If the
opposite temperature scale is desired, refer to
Figure 2-2.)
OFF
°F [°C]*
Hz
Ω
VAC
V DC
ENTER
Selecting the RTD Mode. Select Pt (Platinum),
then press the ENTER key.
SET FUNC
J
K
E
T
N
R
S
ENTER
b
C
Pt**
Selecting the Terminal Mode. Select the two-
terminal (2T) or four-terminal (4T) mode. 4T
automatically clears configuration data from the
channel a decade higher (n+10). For example,
SET FUNC
2T
4T**
selecting channel
3
for 4T operation will
automatically clear channel 13 of all configuration
data and lock it out from further use.
ENTER
Selecting the "Ice Point" (R0).
Use the
Ro
up/down and left/right arrow keys to enter the
desired number, then press the ENTER key. The
default and most common setting is 100.00
(R0=100.00 ohms at 0 °C [32 °F]).
0 0 0 . 0 0
- to -
9 9 9 . 9 9
* Depends on
Typical
temperature scale.
ENTER
Required
** Channels 1 to 10.
op21f.eps
Figure 2-9. Configuring a Channel to Measure Temperature (RTDs)
2-15
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2635A
Users Manual
Configuring a Channel Off
Perform the procedure in Figure 2-10 to configure a channel for off (no measurement).
In preparation, the instrument must be in the inactive mode (not scanning or monitoring)
and the desired channel must be selected (see Figure 2-3). To exit at any time (changes
not saved), press the C key. When a channel is OFF, it cannot be scanned or
monitored. When a channel function is changed, alarm limits and scaling (Mx+B) for
that channel are changed to their default conditions.
Selecting the OFF Mode. Press the FUNC key
SET FUNC
FUNC
to access the SET FUNC (Set Function) menu.
Press the up/down arrow keys until OFF is
displayed, then press the ENTER key.
OFF
°F [°C]*
Hz
Ω
VAC
V DC
* Depends on
temperature scale.
ENTER
Typical
Required
op22f.eps
Figure 2-10. Configuring a Channel Off
Setting Operating Conditions
After the channels are configured for the desired measurement parameter, set the
following operating conditions to support the intended instrument function:
•
•
•
•
Setting the Scan Interval [Default - 0:00:00 (Continuous)] (Figure 2-11)
Setting the Measurement Rate [Default - Slow] (Figure 2-12)
Setting the Alarms [Default - Alarms off] (Figures 2-13)
Setting the Mx+B Scaling [Default - 1x+0 (no scaling)] (Figure 2-14)
The instrument default settings for each of the above are shown.
2-16
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Front Panel Operations
Setting Operating Conditions
2
Setting the Scan Interval
Perform the procedure in Figure 2-11 to set the time between starts of measurement
scans. In preparation, the instrument must be in the inactive mode (not scanning or
monitoring). To exit at any time (changes not saved), press the C key. The scanning
interval format is HOURS:MINUTES:SECONDS. The minimum is 0:00:00 (continuous
scanning [default]); the maximum is 9:99:99 (9 hours, 99 minutes, 99 seconds). The scan
interval is divided into two portions: the measurement interval when measurements are
actually taken, and the time-out interval that completes the overall scan duration. For
example, if 10 channels can be measured in 8 seconds, and the scanning interval is set
for 30 seconds, the first 8 seconds are used for measurement, while the remaining 22
seconds are used to time out. If the scanning interval is set to less than the measurement
rate, the effect is continuous scanning. For example, if 10 channels can be measured in 8
seconds and the scanning interval is set for 5 seconds, scanning is continuous. To speed
up the measurement rate, refer to Figure 2-12.
INTVL
Setting the Scan Interval. Press the INTVL
(Interval) key to access the scan time menu. The
SET
0: 0 0 : 0 0
- to -
9: 9 9 : 9 9
format is HOURS:MINUTES:SECONDS. Press
the up/down and left/right arrow keys to select
and configure each column in the menu. For
example, a scan interval of 1 hour, 25 minutes,
and 33 seconds would be formatted as 1:25:33.
The column being configured will have a bright
display. When the display shows the desired
interval, press the ENTER key.
Typical
ENTER
Required
op23f.eps
Figure 2-11. Setting the Scan Interval
2-17
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2635A
Users Manual
Setting the Measurement Rate
Perform the procedure in Figure 2-12 to set a fast or slow [default] measurement rate.
The measurement rate affects the time required to scan the configured channels.
However, the fast mode sacrifices one digit of measurement resolution. For example, a
temperature reading of 22.4ºC in the slow mode would become 22ºC in the fast mode, or
27.858V dc in the slow mode would become 27.86 V dc in the fast mode. The fast mode
is normally used to capture rapidly changing measurements or to speed up the
measurement portion of the scan interval.
SHIFT
Setting the Measurement Rate. Press the
SHIFT key and then the right-arrow key to access
RAtE
FASt
SLO
the measurement rate menu. Press the up/down
arrow keys to select either SLO (Slow) or FASt
(Fast), then press the ENTER key.
Typical
Required
ENTER
op24f.eps
Figure 2-12. Setting the Measurement Rate
Setting the Alarms
Perform the procedure in Figure 2-13 to set alarm limits for any configured channel. In
preparation, the instrument must be in the inactive mode (not scanning or monitoring)
and the desired channel must be configured with a measurement function (see Figures 2-
4 to 2-9) and selected (see Figure 2-3). To exit at any time, press the C key; however,
any alarm parameters previously entered will remain. Two alarm limits, alarm 1 and
alarm 2, can be defined for each channel. If applied to a channel with Mx+B scaling, the
alarm is based on the scaled values. An alarm occurs when the measured value on the
channel moves above the HI (High) or below the LO (Low) value. Alarms can start
autoprinting (Figure 5-3), start scanning with the Monitor-Alarm trigger option (Figure
2-19), or trigger other functions via the rear panel digital outputs. In the inactive mode,
any selected channel that is programmed with alarm limits will display LIMIT plus 1
and/or 2 to show which alarms have been set. In the different operating modes, the front
panel will provide an indication of a channel in an alarm condition. Each is discussed
below.
Alarm Indications While Scanning
If a scanned channel is in an alarm condition during the scan, the ALARM annunciator is
turned on (dim display). If all alarm conditions clear during the next scan, the ALARM
annunciator is turned off. See Figure 2-15 for information about the Scan Mode.
2-18
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Front Panel Operations
Setting Operating Conditions
2
Alarm Indications While Monitoring
If the channel being monitored is in an alarm condition, the alarm limit 1 and/or 2
annunciators will be turned on, and the ALARM annunciator blinks bright/dim. The
alarm limit annunciator indicates which alarm has been exceeded. If the monitored
channel is not in alarm, the ALARM annunciator will be off, unless scanning and some
other channel is in alarm, then the ALARM indicator has a steady dim display. See
Figure 2-17 for information about the Monitor Mode.
Alarm Indications While Reviewing
If the channel being reviewed had been in an alarm condition, the ALARM and alarm
limit 1 and/or 2 annunciators will be turned on. The alarm limit annunciator indicates
which alarm has been exceeded. See Figure 2-18 for information about the Review
Mode.
Clearing Alarm Parameters from a Channel
To clear alarm parameters from a channel, the alarm can be programmed to OFF for both
alarm 1 and alarm 2, or the channel function can be changed to any other selection,
including OFF.
Alarm Outputs for Channel 0 to 3 Using the Alarm Outputs Connector
A dedicated transistor-transistor logic (TTL) voltage output is available for channel 0 to
channel 3 alarms, via the rear panel ALARM OUTPUTS connector. (See Chapter 1 of
this manual for connection information.)If a channel is not in alarm, the voltage output at
a connector terminal is a logical high (nominal +5V dc); if a channel is in alarm, the
output is a logical low (nominal +0.7V dc). Alarm outputs are set following each scan.
As shown in Table 2-4, there are 16 different alarm combinations. The decimal
equivalent of the binary half-byte formed by Channel 3 to Channel 0 has significance in
autoprinting operations. (See the following discussion on autoprinting.)
Alarm Outputs for Channels 4 to 20 Using the Digital I/O Connector
A shared transistor-transistor logic (TTL) voltage output is available for channel 4 to
channel 20 alarms via the rear panel DIGITAL I/O connector, using terminals I/O 7 to
I/O 4. (See Chapter 1 of this manual for connection information.)If a channel is not in
alarm, the voltage output at a connector terminal is a logical high (nominal +5V dc); if a
channel is in alarm, the output is a logical low (nominal +0.7V dc). Alarm outputs are set
following each scan. As shown in Table 2-5, the alarm outputs for channels 4 to 20 are
ORed in groups. For example, a logical low at I/O 7 indicates that channel 7 or 11 or 15
or 19 is in an alarm condition. Dedicated alarm channels are available only for channels
0 to 3 (see the above). Assigning alarms to channels 4 to 20 does not disable the
associated I/O output from use by commands from the computer interface. (See using the
"Digital Input/Output Lines" under "Additional Features.") The decimal equivalent of
the binary byte formed by I/O 7 to I/O 0 has significance in autoprinting operations (see
the following discussion) and for certain commands in the instrument command set, e.g.,
LOG?.
2-19
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2635A
Users Manual
Table 2-4. TLL Alarm Outputs (Channels 0 to 3)
Channel 2 Channel 1 Channel 0
0 (Alarm) 0 (Alarm) 0 (Alarm)
Channel 3
0 (Alarm)
Decimal
0
0
0
0
1 (No Alarm)
1
0
0
1 (No Alarm)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
3
0
1 (No Alarm)
4
0
1
5
0
1
6
0
1
7
1(No Alarm)
0
8
1
0
9
1
0
10
11
12
13
14
15
1
0
1
1
1
1
1
1
1
1
1 = No Alarm
0 = Alarm
Note 1. The decimal equivalent of the binary half-byte formed by Channel 3 to Channel 0 is used in
autoprint functions.
Note 2. The TTL alarm outputs are via the ALARM OUTPUTS rear panel connector.
Alarms and Autoprinting
Alarm conditions are indicated for each scanned channel when using the autoprint
function, and the ALM (Alarm) and DIO (Digital I/O) conditions are summarized with a
decimal number. (See Tables 2-4 and 2-5.)An alarm condition can be used to turn
autoprinting on and off by selecting "Print" (printer) or "both" (printer and memory card)
as a data destination, and the data mode as ALAr (Alarm) (see Figure 5-3). When
scanning using the front panel Q key, the printer will print measurement results when
any scanned channel is in alarm. If scanning using the alarm trigger (see Figure 2-19),
the printer will print measurement results only when the monitored channel is in alarm.
Alarms and Monitor-Alarm Triggering
An alarm condition, coupled with the Monitor Mode, can be used to start and stop
measurement scans (see Figure 2-19). When an alarm occurs, scanning begins, and when
the alarm clears, scanning stops.
Alarms and Mx+B Scaling
Alarm settings are affected by Mx+B scaling. The Mx+B scaling determines the value
that the instrument displays, and the alarms are configured for these values.
2-20
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Front Panel Operations
Setting Operating Conditions
2
Table 2-5. TTL Alarm Outputs (Channels 4 to 20)
Channels Channels Channels
6 -or- 5 -or- 4 -or-
Channels
7 -or-
11 -or-
15 -or-
10 -or-
14 -or-
9 -or-
13 -or-
8 -or-
12 -or-
19
18
17
16 -or-
20 -or-
I/O 7
I/O 6
I/O 5
I/O 4
Decimal
0 (Alarm)
0 (Alarm)
0 (Alarm)
0 (Alarm)
31
0
1 (No Alarm)
0
1
1
1 (No Alarm)
1 (Alarm)
127
191
223
239
255
1 (No Alarm)
1
1
1
1
0
1
1
1
1
0
1
1
1 = No Alarm
0 = Alarm
Note 1. The decimal equivalent of the binary byte formed by Channel 4 to Channel 20 is used in autoprint
and computer functions. The decimal values shown here are based on I/O 3 to I/O 0 being equal to logical 1.
Note 2. The above shows the least complicated Digital I/O alarm configurations. Multiple alarms plus the use
of I/O terminals 3 to 0 can conceivably use all 255 digital I/O combinations.
Note 3. The TTL alarm outputs are via the DIGITAL I/O rear-panel connector
Example: A logical 0 at I/O 7 terminals indicates an alarm condition for channel 7, or 11, or 15, or 19. Only
channels 0 to 3 have dedicated alarm outputs on the ALARM OUTPUTS connector.
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2635A
Users Manual
ALRM
ENTER
ENTER
Selecting Alarm 1 or Alarm 2. Press the ALRM
(Alarm) key to access the alarm selection menu.
Use the up/down arrow keys to select alarm 1 or
2, then press the ENTER key.
LIMIT
1
2
Selecting the Alarm Mode. Press the up/down
arrow keys to select an alarm mode, OFF (Off), HI
(High), or LO (Low), then press the ENTER key.
LIMIT
OFF
HI
LO
Selecting the Alarm Numerical Value. Press
the up/down and left/right arrow keys to enter a
five digit number that defines the numerical value
for the alarm, ignoring the decimal point or scale
multiplier. The column being configured will have
a bright display. For example, for an alarm of
132.75V ac, enter +13275. When the entry is
correct, press the ENTER key.
LIMIT
± 0 0 0 0 0
- to -
± 9 9 9 9 9
ENTER
ENTER
ENTER
Selecting the Alarm Decimal Value. Press the
left/right arrow keys to position the decimal point
in the number selected in the previous step. For
the example above, the settings would be 132.75.
When the decimal point is correct, press the
ENTER key.
LIMIT
X
.
X X X X
X X X
X X
X X
X X X
X X X X
.
.
.
X
Selecting the Alarm Scale Multiplier. Press the
up/down arrow keys to select the desired
multiplier: x1 (x1), m (x .001), M (x1,000,000), or
k (x1,000). For the example above, the 132.75
multiplier would be x1. When the multiplier is
correct, press the ENTER key. If alarm 1 is
configured, the procedure continues for alarm 2.
If alarm 2 is configured, the procedure terminates.
LIMIT
x1
m
M
k
Typical
Required
op25f.eps
Figure 2-13. Setting the Alarms
2-22
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Front Panel Operations
Setting Operating Conditions
2
Setting the Mx+B Scaling
Perform the procedure in Figure 2-14 to set the Mx+B scaling for any configured
channel. In preparation, the instrument must be in the inactive mode (not scanning or
monitoring) and the desired channel must be configured with a measurement function
(see Figures 2-4 to 2-9) and selected (see Figure 2-3). To exit at any time, press the C
key; however, any Mx+B parameters previously entered will remain. Scaling allows a
measurement value (x) to be modified with a fixed multiplier (M) and a fixed offset (B).
A channel with scaling other than the default of 1x+0 will display Mx+B when the
channel is selected. When scaling is used, only a number is displayed; function
identifiers such as ºC, Hz, Ω, VAC, and VDC are removed. If the results from Mx+B
scaling are nonsense, double check the signs and multiplier values for M and B.
Examples
Multiplier. If a pressure transducer provides 100 mV for 100 PSI, 200mV dc for 200
PSI, etc., the instrument would read directly in PSI with a multiplier of 1000, or M=+1k
and B=000.00. For example, a PSI of 156.98 would display the number 156.98.
Offset. If you are monitoring line voltage of 115V ac and you want the instrument to
display the variations above and below 115V ac instead of the actual voltage, the
instrument would display the differences by subtracting -115 from the measurements, or
B=-115.00 (M=1.0). For example, 117.21V ac would display only the number 2.21;
113.45V ac would display the number -1.55.
Multiplier and Offset. If the instrument is measuring temperature using the ºF scale, but
you want it to display the measurements in ºC, the conversion formula ºC=5/9(ºF-32),
rewritten in decimal ºC=.55555ºF-17.777, could make the conversion with M=+.55555
(entered as +555.55m) and B=-017.78. For example, 72.2 ºF would display the number
22.28.
Restrictions
Linearity. The transfer characteristic of the transducers or measurement modifications
must be linear, with fixed multipliers (M) and fixed offsets (B).
Overload (OL) Display. The decimal point location and scaling (m, X1, k, M) selected
for the "B" value determines the scaling for the result. For example, if B=xxx.xx x1, the
result will range over ±999.99 only. Anything greater than +999.99 or less than -999.99
will show "OL" (overload).
Clearing Mx+B Scaling from a Channel
To clear Mx+B parameters from a channel, the Mx+B parameters can be programmed to
1x+0 (M=1, B=0), or the channel function can be changed to any other selection,
including OFF.
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2635A
Users Manual
Mx+B
Selecting the M Numerical Value. Press the
Mx+B key to access the Mx+B menu. Press the
up/down and left/right arrow keys to enter a five
digit number that defines the numerical value for
the measurement multiplier, ignoring the decimal
point or scale multiplier. The column being
configured has a bright display. For example, for
SET Mx+B
± 0 0 0 0 0
- to -
± 9 9 9 9 9
an M of 1000 (1k), enter +01000.
entry is correct, press the ENTER key.
When the
ENTER
Selecting the M Decimal Value. Press the
left/right arrow keys to position the decimal point
in the number selected in the previous step. For
the example above, the setting would be +01.000.
When the decimal point is correct, press the
ENTER key.
SET Mx+B
X
.
X X X X
X X X
X X
X X
X X X
X X X X
.
.
.
X
ENTER
Selecting the M Scale Modifier. Press the
up/down arrow keys to select the desired scale
modifier: X1 (x1), m (x .001), M (x1,000,000), or k
(x1,000). For the example above, the +01.000
scale modifier would be k. When the scale
modifier is correct, press the ENTER key.
SET Mx+B
x1
m
M
k
Typical
ENTER
Required
(Continued on the next page)
A
op26f.eps
Figure 2-14. Setting the Mx+B Scaling
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Front Panel Operations
Setting Operating Conditions
2
(Continued from the previous page)
A
Selecting the B Numerical Value. Press the
up/down and left/right arrow keys to enter a five
digit number that defines the numerical value for
the measurement offset, ignoring the decimal
point or scale multiplier. The column being
configured has a bright display. For example, for
a B of -115, enter -11500. When the entry is
correct, press the ENTER key.
SET Mx+B
± 0 0 0 0 0
- to -
± 9 9 9 9 9
ENTER
Selecting the B Decimal Value. Press the
left/right arrow keys to position the decimal point
in the number selected in the previous step. For
the example above, the setting would be -115.00.
When the decimal point is correct, press the
ENTER key.
SET Mx+B
X
.
X X X X
X X X
X X
X X
X X X
X X X X
.
.
.
X
ENTER
Selecting the B Scale Modifier. Press the
up/down arrow keys to select the desired scale
modifier: X1 (x1), m (x .001), M (x1,000,000), or k
(x1,000). For the example above, the -115.00
scale modifier would be x1. When the scale
modifier is correct, press the ENTER key.
SET Mx+B
x1
m
M
k
Typical
ENTER
Required
op26af.eps
Figure 2-14. Setting the Mx+B Scaling (cont)
2-25
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2635A
Users Manual
Operating Modes
With the channels configured and operating conditions set, the instrument is ready for
operation in one of the following modes:
•
•
•
Using the Scan Mode (Figure 2-15)
Using the Monitor Mode (Figure 2-17)
Using the Review Mode (Figure 2-18)
Each operating mode is discussed below. To modify the operating mode with additional
features, such as using the scan triggering, refer to the next main headings in this
chapter, "Additional Features."
Using the Scan Mode
Perform the procedure in Figure 2-15 to start and stop the Scan Mode of operation. The
Scan Mode can be started when the instrument is inactive, in Monitor (Figure 2-17), or
Review (Figure 2-18). Measurement results can be sent to a memory card (see Chapter 3,
"Memory Card Operations") and PC (see Chapter 4, "Computer Operations") or printer
(see Chapter 5, "Printer Operations"). When using the Scan Mode with a memory card,
consider each of the following topics. (Memory card error messages are summarized in
Figure 2-16.)
Memory Card as a Data Destination
Measurement data is not automatically sent to the memory card. Measurement data can
be sent to a printer/PC, to the memory card, to both printer/PC and memory card, or to
neither. If either the printer/PC or memory card, or both are selected, the PRN
annunciator will be on. See Figure 3-4 to set the destination and mode for sending
measurement data to the memory card.
Memory Card Formatting
When the instrument is inactive (not scanning or monitoring), insert a memory card. An
immediate error Err 1/CArd indicates the memory card is not initialized (formatted). See
Figure 3-3 to initialize a memory card.
Memory Card Capacity
A memory card that fills during scanning displays the error Err 3/FULL, meaning
readings are being saved in internal memory (75 scans maximum) and another card
should be inserted. The error changes to Err 4/FULL if the internal memory fills, saving
only the most recent 75 scans. When inserted, the replacement card is updated with the
scans in memory.
Memory Card Files
Data files (dAtxx) are opened manually (see Figure 3-8) or prompted by pressing Q.
Press E to accept file names or use the up/down and left/right arrow keys to select a
file name and then press E. If a data file cannot be opened, error Err 2/FILE will be
displayed, meaning all files dAt00 to dAt99 already exist or the selected file name is
already assigned.
Memory Card Exchange During Scanning
Eject the active card when the BUSY indicator is off and replace with another card. The
instrument opens the same file name on the new card. If this file cannot be opened, Err
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Front Panel Operations
Operating Modes
2
3/bAd is displayed (see Figure 2-16). Err4/bAd indicates the internal memory is full,
saving only the most recent 75 scans. The new card is updated with the scans in memory.
Memory Card Data Extraction
Measurement data recorded onto a memory card can be read only by a PC running
Starter or Logger applications software. If you want to have a copy of the measurement
data when it is being recorded, connect a printer during scan operations (see Chapter 5,
Printer Operation). If using a printer, verify the data destination is "both" (memory
card/printer) (see Figure 5-3).
Starting the Scan Mode. Press the SCAN key to
start scanning. If the data destination includes
SCAN
the memory card and a data file has not been
opened, a dAtxx file will be displayed. If an error
message appears, refer to Figure 2-16.
CH
SCAN ON
SCAN
0:00:00
Path to
OPEn
dAtxx
menu.
Opening a Data (dAtxx) File. Press ENTER to
open the suggested file or use the cursor keys to
select a file name (00 to 99), then press ENTER.
If an error message appears, refer to Figure
2–16. Press the CANCL key to exit without
opening a file or starting scanning.
OPEn
dAtxx
ENTER
Stopping the Scan Mode. Press the SCAN key
again to stop the scan mode (-OFF- will be
displayed momentarily). If SCAN is pressed
during the measurement interval, the
measurements will be completed.
SCAN
SCAN OFF
SCAN
- OFF -
SHIFT
Starting the Single Scan Mode. Press the
SHIFT key then then SCAN key for a single
measure-ment scan. If the data destination
includes the memory card and a data file has not
been opened, a dAtxx file will be displayed. If an
error message appears, refer to Figure 2-16.
SCAN
SINGLE
SCAN
CH
SCAN
0:00:00
Path to
OPEn
dAtxx
menu.
Opening a Data (dAtxx) File. The suggested
dAtxx file can be opened by pressing ENTER, or
the cursor keys can be used to select a file name
(00 to 99), then press ENTER. If an error
message appears, refer to Figure 2-16. Press
the CANCL key to exit without opening a file.
OPEn
dAtxx
ENTER
op27f.eps
Figure 2-15. Using the Scan Mode
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2635A
Users Manual
Memory Card Error Messages
Any illegal memory card operation results in a double "beep" and an error display as
shown in Figure 2-16. If the instrument is scanning and in the Monitor Mode or Review
Mode, only the double beep will be heard for a memory card error. Error messages are
acknowledged by pressing the E or key or by ejecting the memory card.
Card error. Card is missing, unformatted, full of
data, or the write-protect switch is set to "read
only." If error occurs when card is inserted, card
is unformatted. To format a card, see Figure 3-3.
To erase files, see Figure 3-7 (SEtxx files) or 3-9
(dAtxx files). To set write-protect switch, see
Figure 3-1.
File error. Unable to open a file. The selected
file name is already assigned or all file names
have been used (00 to 99). Select another file
name, erase files (Figures 3-7 or 3-9), or use
another card.
Card problem (scans saved). Scanned data is
being stored in internal memory (75 scans
maximum). Take action or the internal memory
will overflow and data will be lost. Insert a usable
replacement card and stored scans will be
transferred to the new card. If action is delayed,
the error message changes to Err 4.
Card problem (scans lost). The most recent 75
scans are stored in internal memory and the
oldest scans are being discarded. Insert a usable
replacement card and the stored scans will be
transferred to the new card.
Replacement card error. The replacement card
is either unformatted, full of data, the identical file
name used for the current scan already exists, or
the write-protect switch is in "read only." Use
another card or stop scanning and correct the
problem. Display alternates with Err 3 or Err 4.
Active card error. The active card recording
measurement data is full. Install a replacement
card and stored scans will be transferred to the
new card. Display alternates with Err 3 or Err 4.
Active card error. The active card has been
removed during scanning. Reinsert the same
card or install a replacement card. Stored scans
will be transferred to the inserted card. Display
alternates with Err 3 or Err 4.
op28f.eps
Figure 2-16. Memory Card Error Messages
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Front Panel Operations
Operating Modes
2
Using the Monitor Mode
Perform the procedure in Figure 2-17 to start and stop the Monitor Mode of operation.
The Monitor Mode can be started when the instrument is in the inactive mode or in the
Scan Mode. The Monitor Mode commands the instrument to display the present
measurement for any selected channel (except channels set to OFF) and to display alarm
information if the channel is in alarm. If the Monitor Mode is used without the Scan
Mode, the instrument operates like a multimeter. If the Monitor Mode is used with the
Scan Mode, the instrument also operates like a multimeter but measurements can be
recorded into memory, printed out, and reviewed (maximum, minimum, last values). The
Monitor-Alarm triggering option uses the Monitor Mode to start or stop scans when a
selected channel goes into or out of alarm (see Figure 2-19). If the instrument is in the
Monitor Mode and scanning using the memory card, any illegal memory card operations
are noted only with a double "beep." When you hear a double beep, exit the Monitor
Mode and investigate the memory card error (see Figure 2-16).
MON
Starting the Monitor Mode. Press the MON key
to start the Monitor Mode. Use the up/down arrow
MON
keys to select any configured channel and
display the current measurement. Any monitored
channel using autoranging will display AUTO.
When the instrument is in the Monitor Mode, an
internal relay closes every 10 seconds as part of
the meter housekeeping activities. Relay closures
are heard as a series of low-level audio "clicks"
coming from the instrument.
CH
MONITOR
ON
XX.XXX
Stopping the Monitor Mode. Press the MON
key again to stop the Monitor Mode (-OFF- will be
displayed momentarily). If the meter is in the
Scan Mode, the front panel changes to the scan
channel/interval timer display.
MON
MONITOR
OFF
MON
- OFF -
op29f.eps
Figure 2-17. Using the Monitor Mode
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2635A
Users Manual
Using the Review Mode
Perform the procedure in Figure 2-18 to operate the Review Mode of operation. The
Review Mode is used any time during or after operation of the Scan Mode. While the
instrument is in the Scan Mode, the last, maximum, and measurements for each scanned
channel are stored in memory and updated with each scan, forming the Review Array.
For example, during scan operations, N can be used to monitor the maximum
measurement of a channel in real time. The Review Array is cleared by a control
sequence (see Figure 2-18 below), or by changing any parameter of any channel or the
measurement rate. The Review Array can be printed out using the L key (see Figure
5-4). If the instrument is in the Review Mode and scanning using the memory card, any
illegal memory card operations is noted only with a double "beep." If a double beep is
heard, exit the Review Mode and check the memory card error (see Figure 2-16).
REVIEW
Examining the Review Values. Press the
REVIEW key to start the Review Mode. Use the
up/down arrow keys to select the channel for
REVIEW
CH
review, then use the left/right arrow keys to view
the LAST (Last), MIN (Minimum), and MAX
(Maximum) values recorded during the past scan
intervals (scan can be active or inactive). Repeat
for each channel of interest. A series of dashes,
REVIEW
- - - - -, indicates all review data has been cleared
either by a control sequence (below), or by
changing any parameter of any channel. OL
LAST
MIN
MAX
indicates an overload. Press the REVIEW key to
exit the Review Mode. If not cleared, review
values will remain in memory for update with the
next scan interval.
REVIEW
REVIEW
SHIFT
REVIEW
REVIEW
Clearing the Review Array. Press the Review
key to start the Review Mode. Press the SHIFT
key and then the REVIEW key to clear all review
data from all channels. If the scan mode is not
active, the display will change to dashes (- - - - -).
If the scan mode is active, new values will
appear. Press the REVIEW key again to exit the
Review Mode.
REVIEW
- - - - -
op30f.eps
Figure 2-18. Using the Review Mode
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Front Panel Operations
Additional Features
2
Additional Features
The following additional features allow the instrument to serve in a variety of
applications:
•
•
•
•
•
•
•
Scan Triggering Options (Figure 2-19)
Totalizer Operation (Figure 2-20)
Digital Input/Output Lines
Setting Date and Time (Figure 2-21)
Reading Instrument Software Versions (Figure 2-22)
Returning to the LOCAL Mode (Figure 2-23)
Front Panel Key Lockout Option (Figure 2-24)
Scan Triggering Options
Perform the procedure in Figure 2-19 to select a triggering option, which can be applied
when the instrument is in the inactive mode (not scanning or monitoring). Normally, a
scan is started by pressing the Q key, but two options can be selected to start a scan
from either an external trigger input or from a monitor-alarm condition. The Q key
overrides a triggering option.
External Trigger
The external trigger input starts a scan from a contact closure or TTL input applied to the
TR and GROUND inputs on the rear panel ALARM OUTPUTS connector (see Figure 1-
7). This option lights the EXT TR annunciator.
Monitor-Alarm Trigger
The Monitor-Alarm trigger starts scanning from a channel that goes into an alarm while
being monitored in the Monitor Mode. When the monitored channel goes into alarm, the
instrument scans for as long as the alarm condition exists. This option lights the TR
annunciator.
Triggering Options and Memory Card Operation
To verify the equipment setup when the memory card is used to record data, use the
Single Scan mode (see Figure 2-15) to record a single scan. Any problems with the
memory card or setup can be observed and corrected. If a triggering option triggers
scanning without an open memory card dAtxx file, the instrument will automatically
open a file when a usable memory card is in the instrument. If no memory card is
installed or the memory card is not usable, the most recent 75 scans are saved in an
internal memory. To record the saved scans, insert a usable memory card and open a file
(see Figure 3-8). The stored scans will be transferred to the card.
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2635A
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SHIFT
MON
Selecting a Trigger Option. Press the SHIFT
key and then the MON key to access the trigger
option menu. Press the up/down arrow keys to
select either ALAr (Alarm) (Monitor-Alarm trigger),
On (On) (External trigger), or OFF (Off) (no
trigger option selected), then press the ENTER
key.
TRIg
ALAr
On
OFF
Typical
ENTER
Required
op31f.eps
Figure 2-19. Scan Triggering Options
Totalizer Operation
Perform the procedure in Figure 2-20 to use the totalizer feature. The totalizer count can
be monitored when the instrument is active or inactive. The totalizer is an internal
counter that sums contact closures or voltage transitions. Connection is at the rear panel
DIGITAL I/O connector, pins SUM and GROUND. A contact closure between SUM and
GROUND or a voltage transition applied to SUM (referenced to GROUND), will cause
the totalizer to advance by one count. The maximum count allowed is 65535 and the
maximum count rate is 5 kHz. Voltages trigger on a low-to-high transition at a nominal
threshold of +1.4 volts. A contact debounce feature is available when the instrument is
operated through a computer interface. (See Chapter 4, "Computer Operations.")
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Front Panel Operations
Additional Features
2
Reading the Totalizer Count. Press the TOTAL
totAL
key to view the contents of the totalizer counter.
The maximum count is 65535. If the maximum
count is exceeded, the display will show OL
(Overload). Press the TOTAL key again to exit.
To reset the counter to zero, see below, Erasing
the Totalizer Count.
XXXXX
TOTAL
TOTAL
Erasing the Totalizer Count. Press the TOTAL
key to view the contents of the totalizer counter.
Press the SHIFT key and then the TOTAL key to
reset the counter to zero. Press the TOTAL key
again to exit.
totAL
XXXXX
TOTAL
SHIFT
totAL
TOTAL
TOTAL
0
op32f.eps
Figure 2-20. Totalizer Operation
Digital Input/output Lines
There are no front panel controls or annunciators for the digital input/output (I/O) lines,
I/O 7 to I/O 0. Connection to the eight I/O lines is via the rear panel DIGITAL I/O
connector. If a logic low is applied to any line, the instrument treats it as an input; if the
instrument sets a line to logic low, the instrument treats it as an output. An output low
condition takes precedence over an input high condition. All digital I/O lines are
controlled by a computer interface (see Chapter 4, "Computer Operations"); however, as
a default, lines I/O 7 to I/O 4 are used to output alarm status conditions for channels 4 to
20 (see Table 2-5). An instrument-generated I/O line alarm output takes precedence over
any other configuration.
All Digital I/O lines are set high (non-active) whenever power is cycled. These lines
remain high until an alarm condition or computer interface command changes an output
state.
Note
Measurements taken with the Monitor function do not affect the digital
outputs.
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2635A
Users Manual
Setting Date and Time
Perform the procedure in Figure 2-21 to set the instrument internal clock and calendar,
which must be correct since measurements are tagged with this time and date. The built-
in clock accuracy is a nominal one minute per month. Once set to the correct date and
time, clock and calendar operation is automatic and no further action is required.
SHIFT
INTVL
Selecting the Year. Press the SHIFT key and
then the INTVL key to enter the date/time menu.
YEAR
0 0
- to -
9 9
With YEAR displayed, use the up/down and
left/right arrow keys to select the two numbers for
the correct year, for example, 94 for 1994, then
press the ENTER key.
ENTER
Selecting the Month and Day. With Mn.dY
(Month.Day) displayed, use the up/down and
left/right arrow keys to select four numbers for the
correct month and day, for example, 07.21 for
July 21, then press the ENTER key.
Mn.dY
0 0 . 0 0
- to -
9 9 . 9 9
ENTER
Selecting the Hour and Minute. With Hr:Mn
(Hour:Minute) displayed, use the up/down and
left/right arrow keys to select four numbers for the
correct hour and minute (24-hour clock), for
example, 14.38 for 2:38 pm, then press the
ENTER key.
Hr:Mn
0 0 . 0 0
- to -
9 9 . 9 9
Typical
Required
ENTER
op33f.eps
Figure 2-21. Setting Date and Time
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Front Panel Operations
Additional Features
2
Reading Instrument Software Versions
Perform the procedure in Figure 2-22 to view the version of the internal software that is
controlling the instrument’s operation. Two software versions are identified with this
procedure: the main software that operates all instrument functions, and the analog-to-
digital software that operates the instrument analog-to-digital converter.
Reading the Software Versions. Press the left
and right arrow keys simultaneously to generate a
display that shows the software versions in the
+
following format:
A 4.7
6.3
Analog-to-Digital
Converter Software
Version (Ver. 4.7
shown)
Main Software
Version (Ver. 6.3
shown)
CANCL
Press the CANCL key to exit.
op34f.eps
Figure 2-22. Reading Instrument Software Versions
Returning to the Local Mode
Perform the procedure in Figure 2-23 to return the instrument from the remote mode to
the local mode. When the instrument is operated over the RS-232 computer interface, the
computer can disable all front panel controls except the Q key, which lights the REM
annunciator (bright). If the REM annunciator is dim, the front panel keys are locked out
(see Figure 2-24).
Returning to the LOCAL Mode. Press the
SHIFT
SHIFT key to return instrument control from
RS–232 computer interface control to front panel
control. When the computer has control, the
REM annunciator is on (bright) and only the
SCAN key operates, triggering single scans.
A
return to LOCAL control is allowed at any time,
even during scanning. (This assumes the RWLS
computer command has not been invoked. See
Section 4 for information on commands REMS,
RWLS, and LOCS.)
op35f.eps
Figure 2-23. Returning to LOCAL Mode
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Front Panel Key Lockout Options
Perform the procedure in Figure 2-24 to lockout the front panel key functions. There are
three lockout features:
•
•
Monitor Mode Lockout
Review Mode Lockout
A third lockout can be enabled only from the computer interface (see the LOCK 3
command in Chapter 4).
The Monitor Mode lockout is entered when the instrument is in the Monitor Mode; the
Review Mode Lockout is entered when the instrument is in the Review Mode. When
lockout is enabled, the instrument becomes "locked" in a selected mode preventing any
unauthorized instrument operations. A repeat of the lockout keystrokes releases the
lockout and the instrument resumes normal operation. When in the locked condition, the
front panel REM indicator is on (dim). This feature allows inexperienced operators to
use the instrument without having to change the mode of operation. The keystrokes used
to enable or disable the lockout option is normally not revealed to unauthorized
personnel.
Lockout Enable. Press the FUNC and Mx+B
keys at the same time to lock out the front panel
REM
key functions appropriate to the selected mode.
The REM (Remote) annunciator will light.
MODE]
[MONITOR
FUNC
Lockout
- or -
+
on
Mx+B
[REVIEW
MODE]
Lockout Disable. Press the FUNC and Mx+B
keys at the same time to exit the lockout mode.
The REM (Remote) annunciator will go off and
normal key function will return.
[MONITOR
MODE]
FUNC
Lockout
off
- or -
+
Mx+B
[REVIEW
MODE]
op36f.eps
Figure 2-24. Front Panel Key Lockout Options
Instrument Interfaces
Front panel operations that involve interfacing with memory cards, PCs, printers, and
modems are described in separate manual chapters, as follows.
Memory Card Interface
The Memory Card Interface is described in detail in Chapter 3, "Memory Card
Operations."
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Front Panel Operations
Instrument Interfaces
2
RS-232 Computer Interface
The Computer Interface is described in detail in Chapter 4, "Computer Operations."
Using the RS-232 Computer Interface With a Printer
The Printer Interface is described in detail in Chapter 5, "Printer Operations."
Using the RS-232 Computer Interface With a Modem
The Modem Interface is described in detail in Chapter 6, "Modem Operations."
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Chapter 3
Memory Card Operations
Title
Page
Memory Card Files ....................................................................................... 3-3
Setup Files..................................................................................................... 3-4
Data Files ...................................................................................................... 3-4
Memory Card Capacity................................................................................. 3-4
Memory Card Battery ................................................................................... 3-5
Inserting a Memory Card .............................................................................. 3-5
Removing a Memory Card............................................................................ 3-5
Initializing a Memory Card ............................................................................... 3-7
Setup File Procedures........................................................................................ 3-9
Using Setup Store.......................................................................................... 3-9
Using Setup Load.......................................................................................... 3-10
Using Setup Erase ......................................................................................... 3-11
Data File Procedures ......................................................................................... 3-12
Using Data Open........................................................................................... 3-12
Using Data Erase........................................................................................... 3-13
Setup and Data Files Directory ......................................................................... 3-14
Setup and Data File Current Status ................................................................... 3-15
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DATA BUCKET
REVIEW
LAST
HYDRA
CH
mA
mVDCAC
Hz
M
k
V
COM
REVIEW
CLEAR
PRINT
MODE
INTVL
SCAN
CLOCK
ALRM
FUNC
Mx+B
SINGLE
300V
MAX
RATE
MON
TOTAL
ZERO
ENTER
LIST
SHIFT
CANCEL
TRIGS
COMM
LOCAL
BATT
BUSY
MELCARD
NFGFHMELCARD
KB
256
NFGFHMELCARD
NFGFHMELCARD
op81f.eps
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Memory Card Operations
Summary of Memory Card Operations
3
Summary of Memory Card Operations
Memory card operations use a small, lightweight memory card (Figure 3-1) to save and
load setup files (instrument configurations) and to record measurement data during
scanning. The memory card consists of static random-access memory (SRAM) powered
by an internal battery. Care should be taken not to drop or bend the card, and to keep it
dry and away from high and low temperature extremes. Memory card operation is
allowed in the same temperatures and humidity specifications that apply to the
instrument (see Appendix A, "Specifications"). SRAM memory cards are readily
available from supply houses serving the computer industry, or from Fluke (see Table 1-
2, "Options and Accessories").
INSERTION
DIRECTION
68-PIN CONNECTOR
256 KB
SRAM
WRITE-PROTECT SWITCH
LITHIUM BATTERY 3 VOLTS
op37f.eps
Figure 3-1. Typical Memory Card
Memory Card Files
Two types of memory card files are used. Files that store instrument configurations are
setup files, SEtxx, and files that store measurement data are data files, dAtxx, where xx
is and integer from 00 to 99. The number xx can be assigned by the instrument or
selected by the operator. When the assigned integer reaches 99, previous integers
available from erased files or numbers skipped over are reassigned for subsequent new
files. The memory card can contain a maximum of 100 SEtxx and 100 dAtxx files.
3-3
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Setup Files
When the front panel controls have been used to configure channels for a particular
instrument application, including type of measurement, alarms, scaling, rate, and all
other operating parameters, this configuration can be saved as a SEtxx files. If this is the
first setup file saved on the memory card, the instrument will assign 00 for the file name
SEt00, or you can select your own file number. The instrument displays only the SEtxx
portion, but all files are appended with the extension .HYD. Subsequent setup files
would be Set01, Set02, and so on. The user should note the file name assigned or
selected for a particular instrument configuration. A directory of card files are easily
viewed and print out using the directory feature (Figure 3-10). Setup files allow the
entire instrument to b e configured for an operation in and instant. The “Logger”
applications software can be used to create setup files that are tagged with a user-defined
string.
Data Files
Data files, dAtxx, are opened automatically at scanning when the memory card is
selected as a destination for measurement data. The display will indicate the file being
opened. For example, pressing the Q key will display dAt00 (for the first data file on
the memory card), which is acknowledged by pressing E, and then the scanning
begins. A file number can be selected as well. The instrument displays only the dAtxx
portion, but all files are appended with the extension .HYD. If scanning is stopped, then
resumed without changing instrument configuration or the memory cared, the data will
be appended to the opened file. If any parameter is changed or the memory card is
changed, the next scan cycle will open a new dAtxx file. Extraction measurement data
from the data files is accomplished by a PC running Starter or Logger applications
software. The data is read to the PC from the memory card in the instrument, using an
RS-232 link, or the memory card can be taken to a PC equipped with a memory card
reader (optional - see Table 1-2, “Options and Accessories”). The PC Logger
applications software allows separate data files to be edited and combined into a single
file.
Memory Card Capacity
An empty 256K-byte memory card (supplied) will store 4,800 scans of ten channels; an
empty 1M-byte memory card (optional) will store 19,800 scans of ten channels. SRAM
memory cards are available in a variety of sizes. When scanning and recording data onto
the memory card, the front panel indicates what percentage of the memory card has been
used (Figure 3-2). For example, a display of 74Pct indicates 74% of the card has been
used.
SCAN
PRN CH
op38f.eps
Figure 3-2. Front Panel Memory Card Percent Display
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Memory Card Operations
Inserting and Removing the Memory Card
3
Memory Card Battery
A typical SRAM is powered by an internal lithium 3-volt battery that has a minimum life
of five years for a 256K-byte card, and two years for a 1M-byte card. If the battery
voltage falls below 2.75 volts, the front panel BATT indicator will light (see Figure 1-1).
Battery life is reduced in applications with high ambient temperature.
Inserting and Removing the Memory Card
Memory card operations that involve inserting and removing the card are described
below. Any illegal memory card operations result in an instrument double "beep" and an
error message. Error messages are summarized in Table 3-1.
Inserting a Memory Card
To insert the memory card into the instrument, orient the card so the insertion-direction
arrows are on top and point towards the card reader slot. Push the card at the center of
the edge into the slot until resistance is noted, then firmly push until seated in the
connector. If the instrument responds with a double beep and error message, the inserted
card is unformatted (see the initialization procedure in Figure 3-3).
Removing a Memory Card
To remove the memory card from the instrument, press the ejection button to the right of
the card (see Figure 1-1). The button should be pressed firmly until it becomes flush with
the instrument front panel. This action ejects the card from the connector and pushes it
free of the reader assembly. Grasp the card and remove from the instrument.
Changing the Memory Card During Scanning
When recording measurement data to a memory card that is nearly full (as noted by the
percent indication), remove the memory card in the normal way when the BUSY
indicator is off. Then insert a new memory card (be sure it is formatted), which will
automatically open a file with the same number and continue recording data. For
example, if scanning started with dAt17 on the original card, dAt17 will be opened on
the replacement card. If the same filed already exists on the replacement card, e.g.,
dAt17, an error message appears. No data is lost during this operation as the instrument
stores up to 75 scans when the memory card is removed during scanning, and the new
memory card is immediately updated with this stored data. The PC software "Logger"
allows separate memory card files to be combined into a single file.
Setting the Memory Card Write-protect Feature
The memory card (Figure 3-1) has a write-protect switch that can be positioned to
prevent the writing of data to the card, the erasing of any dAtxx or SEtxx file, or the
initialization of the memory card. Normally, this switch is placed in the read/write
position. However, if the card has critical data that should be protected, the switch is
placed in the write-protect (read only) position.
Installing or Replacing the Memory Card Battery
To install or replace the battery in the memory card, follow the instructions supplied
with the memory card. A typical battery installation is shown in Figure 3-1. Memory
card batteries are readily available from supply houses serving the computer industry
(typically 3V dc, Panasonic BR2325, Maxell CR2025, or equal).
3-5
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Table 3-1. Memory Card Error Codes
Probable
Error
Cause
Err 1 Card
CARD ERROR- Unable to use a card (Note 1):
Card is missing or card is not fully inserted.
Card is unformatted.
Install a memory card (Fig. 3-1).
Initialize a memory card (Fig. 3-3).
Reposition switch (Fig. 3-1).
Write-protect switch in the read -only position.
Card is 100% full of data
Erase files (Fig. 3-7/3-9) or use another
card.
Err 2 FILE
FILE ERROR- Unable to open a file (Note 1):
The selected file name already exists.
Choose another file name (Fig. 3-5/3-8)
or erase files (Fig. 3-7/3-9).
All file names are assigned (SEt00, SEt99 or
dAt00 to dAt99).
Erase files (Fig. 3-7/3-9) or use another
card.
Err 3 bAd
CARD PROBLEM (Scans Saved) (Note 1):
Card exchanged during scanning is
unformatted.
Use a formatted card (Note 2).
Use a different card (Note 2).
Use a different card (Note 2).
Card exchanged during scanning is full of
data.
Replacement card has a duplicate file name.
(Note 4).
Err 4 bAd
CARD PROBLEM (Scans Lost) (Note 1):
Same as Err 3 bAd (Note 3).
Err 3 FULL
Err 4 FULL
CARD IS FULL (Scans Saved) (Note 1):
Card is 100% full of data.
Use a different card (Note 2).
CARD IS FULL (Scans Lost) (Note 1):
Sane as Err 3 FULL (Note 3)
Note 1: Err 1 and Err 2 are non-scanning errors that occur only before scanning starts. Err 3 and Err 4
are scanning errors that occur only after scanning starts.
Note 2: Err 3 indicates scans are being saved in an internal memory (75 scans) while the memory card
error is being resolved. Err 4 indicates scans are bin lost because the internal memory overflowed (75
scans) before the error was corrected. When a suitable exchange card is inserted, the internal memory
updates the card with the stored scans.
Note 3: When memory cards are exchanged during scanning and the replacement card has a problem,
Err 3/Err 4 is appended with the word bAd. When the memory card used for scanning becomes full of
data, Err 3/Err 4 is appended with the word FULL.
Note 4: When memory cards are exchanged during scanning, the replacement card must have the same
file name available as was used for the original scan. If this file name already exists on the replacement
card, and Err 3/Err 4 will occur.
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Memory Card Operations
Initializing a Memory Card
3
Initializing a Memory Card
Perform the procedure in Figure 3-3 to initialize (format) a memory card. Memory cards
can also be formatted at a PC if it is equipped with a memory card reader. (Formatting at
a PC uses the format utility supplied with the memory card reader.)When the memory
card is formatted, a standard DOS file system and directory are put into the memory on
the card. To exit at any time (formatting not completed), press the C key.
Note
Any scan data that may be stored in the internal memory waiting to be
written to a valid memory card (see paragraph 3-8 Changing the Memory
Card During Scanning) will be lost when formatting a memory card.
Selecting the INITIALIZATION mode. Insert the
FILES
Init
StAt
dir
FILES
memory card to be initialized. Press the FILES
key to access the FILES menu. Press the
up/down arrow keys until Init is displayed, then
press the ENTER key. The menu changes to
Init. If an error message appears, see Table 3-1.
dAtA
SEtUP
ENTER
Verifing the INIT mode. To verify the selection
of the initialization mode, press the up/down
arrow keys until yES is displayed in the Init menu,
Init
yES
no
then press the ENTER key.
To exit the
procedure, select no and then press the ENTER
key. If yES is selected, the menu changes to
SUrE.
ENTER
Initializating the memory card. Press the
up/down arrow keys to select yES or no in the
SUrE menu, then press the ENTER key. "yES"
will initialize the memory card, erasing all
previous data (if any); "no" cancels the
procedure. If Err 1 CArd appears, the small
switch on the card may be in the write-protect
position. Reposition the switch and repeat this
procedure.
SUrE
yES
no
Typical
Required
ENTER
op39f.eps
Figure 3-3. Initializing a Memory Card
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Recording Measurement Results During Scanning
Perform the procedure in Figure 3-4 to record measurement results onto the memory
card. The destination for the scanned data can be the memory card, printer, both the
memory card and printer, or no destination, where the results are not saved, except in the
Review array (last, maximum, and minimum scanned values) and in the 100-scan
internal memory FIFO (First In First Out) log queue. (The internal memory log queue is
accessed only through the computer interface. See Chapter4, "Computer
Operations.")The mode for recording to the memory card or printer can be all scanned
data, scanned data only when any scanned channel is in alarm, or single scans when an
alarm transitions into or out of alarm.
Note
Measurement results recorded onto a memory card are extracted only by a
PC running the Starter or Logger applications software. If printed results
are desired as well as recording to the memory card, then "both" must be
selected in the procedure below and a printer must be connected to the RS-
232 port. See Chapter5, Printer Operations, for more information.
SHIFT
FILES
Setting the DESTINATION Parameter. Press
the SHIFT key, release, then press the FILES
dESt
key to open the destination menu. Select both
(Both) to route measurement data to both the
memory card and printer; select Card (Card) to
route measurement data just to the memory card.
both
Print
CArd
nonE
ENTER
Selecting the Destination MODE.
The
MOdE
destination mode determines when the memory
card should record. Select trAns (Transition) to
record one complete scan when a channel has
transitioned into or out of an alarm limit. Select
ALAr (Alarm) to record all channel scans while
any channel is in an alarm condition (stopping
when all channels are out of alarm). Select ALL
(All) to record all scans.
trAnS
ALAr
ALL
Typical
ENTER
Required
op40f.eps
Figure 3-4. Recording Measurement Results During Scanning
3-8
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Memory Card Operations
Setup File Procedures
3
Setup File Procedures
Perform the following procedures to LOAD, STORE, and ERASE memory card
instrument configuration (SEtUP) files.
Using Setup Store
Perform the procedure in Figure 3-5 to save the current instrument configuration. The
communication parameters: baud, parity, CTS, and echo, remain as set previously by the
front panel controls or computer interface. The instrument automatically assigns the next
sequential SEtxx file name. When SEt99 is reached, the instrument loops back to reuse
previously assigned file names that have been erased or skipped over. To assign your
own file name, use the up/down and left/right arrow keys when creating the file.
Selecting the SETUP mode. Press the FILES
FILES
Init
StAt
dir
FILES
key to access the FILES menu. Press the
up/down arrow keys until SEtUP is displayed,
then press the ENTER key. The menu changes
to SEtUP. If an error message appears, see
Table 3-1.
dAtA
SEtUP
ENTER
Selecting the STORE mode.
Press the
SEtUP
up/down arrow keys until StorE is displayed in
the SEtUP menu, then press the ENTER key.
The menu changes to StorE and a file name is
displayed.
ErASE
StorE
LOAd
ENTER
Storing a SEtxx File. Record the displayed
SEtxx file name, where xx represents an
instrument-assigned number between 00 and 99
or use the up/down, left/right arrow keys to select
the xx number. Press the ENTER key to store
the file.
StorE
SEt99
SEtxx
SEt00
Overwriting a SEtxx File. If the xx number
selected in the previous step is already assigned,
the existing file will be overwritten with the new
file. If this is desired, select yES then press the
ENTER key. If no is selected, the procedure will
terminate. If an error message appears, see
Table 3-1.
SUrE
yES
no
ENTER
ENTER
Typical
Required
op41f.eps
Figure 3-5. Using SETUP STORE to Save Configuration Files
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Using Setup Load
Perform the procedure in Figure 3-6 to discard the current instrument configuration and
load a configuration saved in a previous SETUP STORE operation (Figure 3-5). A
configuration file includes channel configurations, scan interval, measurement rate,
alarms, Mx+B scaling, and temperature unit (ºC or ºF). Communication parameters,
baud, parity, CTS, and echo remain as set previously by the front panel controls. To exit
at any time (file not loaded), press the C key.
Selecting the SETUP mode. Press the FILES
FILES
Init
StAt
dir
dAtA
SEtUP
FILES
key to access the FILES menu. Press the
up/down arrow keys until SEtUP is displayed,
then press the ENTER key. The menu changes
to SEtUP. If an error message appears, see
Table 3-1.
ENTER
Selecting the LOAD mode. Press the up/down
arrow keys until LoAd is displayed in the SETUP
menu, then press the ENTER key. The menu
changes to LoAd.
SEtUP
ErASE
StorE
LOAd
ENTER
Selecting a SEtxx File to LOAD. Press the
up/down arrow keys until the SEtxx file to be
loaded is displayed in the LoAd menu, where xx
represents a number from 00 to 99, then press
the ENTER key. After ENTER is pressed, the
entire meter configuration changes to reflect the
data stored in the selected SETUP file. A display
of nonE indicates no setup files are stored.
LoAd
SEt99
SEtxx
SEt00
Typical
Required
ENTER
op42f.eps
Figure 3-6. Using SETUP LOAD to Load Configuration Files
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Memory Card Operations
Setup File Procedures
3
Using Setup Erase
Perform the procedure in Figure 3-7 to remove a setup file from the memory card.
Removing a file does not interrupt the sequential SEtxx file names assigned with the
SEtUP STORE command. When SEt99 is reached, the instrument loops back to reuse
previously assigned file names that have been erased or skipped over. To exit at any time
(file not erased), press the C key.
Selecting the SETUP mode. Press the FILES
FILES
Init
StAt
dir
dAtA
SEtUP
FILES
ENTER
ENTER
ENTER
key to access the FILES menu. Press the
up/down arrow keys until SEtUP is displayed,
then press the ENTER key. The menu changes
to SEtUP. If an error message appears, see
Table 3-1.
Selecting the ERASE mode.
Press the
SEtUP
up/down arrow keys until ErASE is displayed in
the SEtUP menu, then press the ENTER key.
The menu changes to ErASE.
ErASE
StorE
LOAd
Selecting a SEtxx File to ERASE. Press the
up/down arrow keys until the SEtxx file to be
erased is displayed in the ErASE menu, where xx
represents a number from 00 to 99, then press
the ENTER key. The menu changes to SUrE.
ErASE
SEt99
SEtxx
SEt00
Erasing a SEtxx File. Press the up/down arrow
keys to select yES or no in the SUrE menu, then
press the ENTER key. yES will erase the file, no
will cancel the procedure and nothing will be
erased. The procedure repeats after pressing
ENTER, or displays nonE if there are no files to
erase. Press the CANCL key to exit. If an error
message occurs, see Table 3-1.
SUrE
yES
no
Typical
Required
ENTER
op43f.eps
Figure 3-7. Using SETUP ERASE to Delete Configuration Files
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Data File Procedures
Perform the following procedures to OPEN, LOAD, STORE, and ERASE memory card
instrument data (DATA) files.
Using Data Open
Perform the procedure in Figure 3-8 to open a data file in preparation for recording
measurement data to the memory card. This procedure is automatically invoked if the
Q key is pressed and the instrument is configured for memory card operations. The
instrument automatically assigns the next sequential dAtxx file name. To assign your
own file name, use the up/down and left/right arrow keys when creating the file. When
dAt99 is reached, the instrument loops back to reuse previously assigned file names that
have been erased or skipped over. Data cannot be appended to an existing file, except in
the case where scanning is turned off and on without changing the instrument
configuration. Before using the DATA OPEN command, verify the instrument is
configured for measurement. If a file is opened and then the instrument configuration is
changed, the file will automatically be closed.
Selecting the DATA mode. Press the FILES
FILES
Init
StAt
dir
dAtA
SEtUP
FILES
key to access the FILES menu. Press the
up/down arrow keys until dAtA is displayed, then
press the ENTER key. The menu changes to
dAtA. If an error message appears, refer to
Table 3-1.
ENTER
Selecting the OPEN mode. Press the up/down
arrow keys until OPEn is displayed in the dAtA
menu, then press the ENTER key. The menu
changes to OPEn and a file name is displayed.
dAtA
ErASE
OPEn
ENTER
Opening a dAtxx File. Record the displayed
dAtxx file name, where xx represents an
instrument-assigned number from 00 to 99. Or
use the up/down, left/rightarrow keys to select the
xx number. Press the ENTER key to open the
file. If an error message appears, see Table 3-1.
OPEn
dAt99
dAtxx
dAt00
The "dESt" menu appears if a dAtxx file is
opened and the memory card is not selected as a
data destination (see Figure 3-4).
Typical
Required
ENTER
op44f.eps
Figure 3-8. Using DATA OPEN to Save Measurement Data in a File
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Memory Card Operations
Data File Procedures
3
Using Data Erase
Perform the procedure in Figure 3-9 to remove a data file from the memory card.
Removing a file does not interrupt the sequential dAtxx file names assigned with the
DATA OPEN command. When dAt99 is reached, the instrument will loop back and
reuse previously assigned file names that have been erased or skipped over. To exit at
any time (file not erased), press the C key.
Selecting the DATA mode. Press the FILES key
FILES
Init
StAt
dir
FILES
to access the FILES menu. Press the up/down
arrow keys until dAtA is displayed, then press the
ENTER key. The menu changes to dAtA. If an
error message appears, see Table 3-1.
dAtA
SEtUP
ENTER
Selecting the ERASE mode.
Press the
dAtA
up/down arrow keys until ERASE is displayed in
the dAtA menu, then press the ENTER key. The
menu changes to ErASE.
ErASE
OPEn
ENTER
Selecting a dAtxx File to ERASE. Press the
up/down arrow keys until the dAtxx file to be
erased is displayed in the ErASE menu, where xx
represents a number from 00 to 99, then press
the ENTER key. The menu changes to SUrE.
ErASE
dAt99
dAtxx
dAt00
ENTER
Erasing a dAtxx File. Press the up/down arrow
keys to select yES or no in the SUrE menu, then
press the ENTER key. yES will erase the file; no
will cancel the procedure and nothing will be
erased. The procedure repeats after pressing
ENTER, or displays nonE if there are no files to
erase. Press the CANCL key to exit. If an error
message occurs, see Table 3-1.
SUrE
yES
no
Typical
Required
ENTER
op45f.eps
Figure 3-9. Using DATA ERASE to Delete a Measurement Data File
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Setup and Data Files Directory
Perform the procedure in Figure 3-10 to obtain a directory of existing SEtxx files and
dAtxx files that exist on the memory card, plus the remaining capacity of the card. The
size of the selected file is given in the front panel display in K-bytes. To exit at any time
(directory not completed), press the C key.
Selecting the DIRECTORY mode. Press the
FILES
Init
StAt
dir
FILES
FILES key to access the FILES menu. Press the
up/down arrow keys until dir is displayed, then
press the ENTER key. The menu changes to
nnnnK, where nnnn represents a number of
kilobytes. If an error message appears, see
Table 3-1.
dAtA
SEtUP
Viewing the Available Memory Card Capacity.
The bytes available on the memory card are
displayed first as an overall directory summary.
nnnnK
FrEE
ENTER
Viewing the files. To view the size of the
individual files, press the up/down arrow keys
until the desired SEtxx or dAtxx file is displayed,
where xx presents the file identification number
from 00 to 99. The size of the selected file, in
nnnnK
SEt99
SEtxx
SEt00
dAt99
dAtxx
dAt00
kilobytes, is displayed.
When directory
operations are complete, press the ENTER key.
ENTER
Typical
Required
op46f.eps
Figure 3-10. Using DIRECTORY to Examine SETUP and DATA files
3-14
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Memory Card Operations
Setup and Data File Current Status
3
Setup and Data File Current Status
Perform the procedure in Figure 3-11 to display the status of the memory card SEtxx and
dAtxx files that are currently in effect or were in effect for the most recent scan. The xx
portion of the file name represents a file identification number from 00 to 99.
Selecting the STATUS mode. Press the FILES
FILES
Init
StAt
dir
FILES
key to access the FILES menu. Press the
up/down arrow keys until StAt is displayed, then
press the ENTER key.
dAtA
SEtUP
ENTER
Status of the Memory Card. The percent of the
capacity of the memory card that has been used
is shown, where nn represents a number from 00
to 99. If no memory card is installed, the display
is --Pct.
USEd
nnPct
Status of the SEtxx File. The setup file that was
in effect for the most recent scan is shown, where
xx represents a file number from 00 to 99. If no
setup file was open, nonE is displayed.
ENTER
SEtUP
SEtxx
-or-
nonE
Status of the dAtxx File. The data file that was
open for the most recent scan is shown, where xx
represents a file number from 00 to 99. If no data
file was open, nonE is displayed.
dAtA
dAtxx
-or-
nonE
Typical
Required
op47f.eps
Figure 3-11. Using STATUS to Examine SETUP and DATA Files
3-15
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2635A
Users Manual
Memory Card File Operations to and from a PC
All memory card file transfers to and from the instrument are controlled at the PC.
Nothing is required at the instrument end, except to have the RS-232 link operating
correctly (see Chapter4, "Computer Operations") and having the desired memory card
installed in the instrument front panel. Refer to the applications software documentation
supplied with Starter (supplied) or Logger (optional).
3-16
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Chapter 4
Computer Operations
Title
Page
Summary of Computer Operations.................................................................... 4-3
Connecting the Instrument to a PC.................................................................... 4-3
How the Instrument Processes Input............................................................. 4-12
Input Terminators.......................................................................................... 4-12
Input String Examples................................................................................... 4-13
Status Registers............................................................................................. 4-14
Status Byte Register (STB)....................................................................... 4-17
Xmodem File Transfers ................................................................................ 4-18
4-1
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2635A
Users Manual
DATA BUCKET
REVIEW
LAST
HYDRA
CH
mA
mVDCAC
Hz
M
k
V
COM
REVIEW
CLEAR
FILES
MODE
INTVL
SCAN
CLOCK
ALRM
FUNC
Mx+B
SINGLE
300V
MAX
RATE
MON
TOTAL
ZERO
ENTER
LIST
SHIFT
CANCEL
TRIGS
COMM
LOCAL
BATT
BUSY
op82f.eps
4-2
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Computer Operations
Summary of Computer Operations
4
Summary of Computer Operations
Computer operations allow the instrument to be configured and controlled from a
personal computer (PC), including data exchanges with the instrument memory card.
The computer interface is via an RS-232 link between the instrument RS-232 port and a
PC serial COM port. The PC gives operation and configuration commands to the
instrument, and the instrument returns status signals (alarms, for example) and scan
measurement data. PC operations can be in real time with a dedicated RS-232
connection, or the instrument can be connected to a PC for configuration and then
removed for distant operations. Memory Card features are described in Chapter 3,
Memory Card Operations.
PC applications software Hydra Series II Starter Package (Starter) and Hydra Series II
Logger Package (Logger) (optional) operate the RS-232 computer interface. The
software packages are described in separate technical manuals; however, each
accomplishes the following:
Starter (supplied) Starter is a menu-driven software package used to transfer
configuration data from and to the instrument, log measurement data
collected by the instrument, and manage the acquired data.
Logger (optional) Hydra Series II Logger is an optional full featured Windows based
configuration
and data logging package. It can communicate with two Hydras at
once and can also utilize telephone modems for remote
applications. A brochure with complete details is available.
Custom software can be developed by the user in GWBASIC, Quick BASIC (QBASIC),
or Quick C using the computer interface command set, which is described in this
chapter.
The RS-232 computer interface between a instrument and a PC is discussed in the
following paragraphs in this sequence:
•
•
•
•
•
Connecting the Instrument to a PC
Configuring the Instrument for Computer Operations
Configuring the PC for Computer Operations
Testing the Instrument/PC RS-232 Interface
Computer Interface Commands and Operation
Connecting the Instrument to a PC
The two most common configurations for connecting the instrument to a PC are shown
in Figure 4-1. The instrument RS-232 port (DB-9 connector) is cabled to a PC serial
COM port that uses either a DB-9 connector or DB-25 connector. The connecting cable
can be fabricated (see Appendix D) or ordered from Fluke as an option (see Chapter 1).
4-3
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2635A
Users Manual
PC
PC CONNECTION
WITH DB-9
CONNECTOR
HYDRA
RS-232
(DB-9)
(MALE)
COM PORT
(DB-9)
(MALE)
FLUKE R543 CABLE
(OR EQUAL)
PC
PC CONNECTION
WITH DB-25
CONNECTOR
HYDRA
RS-232
(DB-9)
FLUKE RS40 CABLE
(OR EQUAL)
COM PORT
(DB-25)
(MALE)
(MALE)
op48f.eps
Figure 4-1. Connecting the Instrument to a PC
4-4
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Computer Operations
Configuring the Instrument for Computer Operations
4
Configuring the Instrument for Computer Operations
Correct operation of the interface between the instrument and PC depends on the baud
rate, parity, CTS (Clear To Send) and echo of the RS-232 interface parameters. Perform
the procedure in Figure 4-2 to establish these parameters for the instrument. The
instrument uses one stop bit, which is not selectable.
SHIFT
Selecting the bAUd (Baud) Rate. Press the
SHIFT key, release, and then press the LIST key
bAUd
LIST
to open the communications parameters menu.
The baud rate sets the rate of data transfer
between the instrument and the PC. Normally,
the highest compatible rate is selected. Select
the rate using the up/down arrow keys, then
press ENTER.
38400
19200
9600
4800
2400
1200
600
300
ENTER
ENTER
ENTER
ENTER
Selecting PAR (Parity).
The 8th bit of a
PAR
character can be set to make all characters odd
(Odd) or even (E), or no parity at all (no). The
computer checks parity (if selected) and indicates
when an error is detected. Select the parity then
press ENTER.
no
E
Odd
Selecting CtS (Clear To Send). The RS-232
CTS line (pin 8) is an input hardware control line
derived from the PC Request to Send (RTS) line.
When CTS is asserted, the instrument is allowed
CtS
On
OFF
to transmit data.
If the PC RS-232 interface
does not have or use an RTS line, select OFF
then press ENTER.
Selecting Echo.
character sent to the instrument is "echoed" back
to the PC. The applications software Starter
When echo is On, each
Echo
On
OFF
and Logger automatically turn echo OFF. The
primary use of Echo On is for operations with a
terminal emulator. Select the Echo parameter
then press ENTER.
Typical
Required
op49f.eps
Figure 4-2. Configuring the Instrument for Computer Operations
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2635A
Users Manual
Configuring the PC for Computer Operations
Operation of the instrument from a PC always involves software, either software
supplied with the instrument (Starter) or software developed by the user (GWBASIC,
QBASIC or Quick C). Since the PC COM port is set up by the operating software, there
is no separate configuration procedure.
Testing the Instrument/PC RS-232 Interface
The RS-232 link between the instrument and PC should be tested before it is used for
communications. Since DOS commands cannot test the link, some form of software
control is required. Four procedures are provided:
•
•
•
•
Testing using terminal emulation (Windows)
Testing using terminal emulation (Generic)
Testing using commands while in GWBASIC
Testing using commands while in QBASIC
The RS-232 computer interface can also be tested using the TERM (Terminal) mode in
both Starter and Logger applications software. Refer to the technical manuals supplied
with the software for the test procedures.
Testing the RS-232 Interface Using Terminal Emulation (Windows)
Complete the procedure below to test the RS-232 link between the PC and instrument
using the PC Windows terminal emulator. Identify the PC COM port used for the RS-
232 link (COM1 is assumed).
1. Configure the Data Bucket communication parameters, as described in Figure 4-2,
for bAUd = 9600, PAR = no, CtS = OFF, and Echo = On.
2. Turn on the PC, start Windows, open the Accessories menu and select Terminal.
3. Open the Terminal Settings menu and select Communications.
4. In Communications, select the following, then use OK to exit to Terminal:
Connector COM1 [Typical]
Baud Rate 9600
Data Bits 8
Stop Bits 1
Parity None
Flow ControlNone
5. In Terminal, request the Data Bucket to send its identification number by entering:
*IDN? <Enter>. If *IDN? did not appear on the screen as the characters were
entered, be sure the instrument RS-232 port is configured for Echo = On (Figure 4-
2). If the wrong characters appear, there is an incompatibility in the COM port
configurations (baud rate, parity, etc.). If everything seems normal, but characters
still don’t appear, check the RS-232 connection cable (see Appendix D). When the
RS-232 link is operating correctly, the instrument returns an identification string and
execution prompt similar to the following:
FLUKE,2635A,0,Mn.n An.n Dn.n Ln.n
=>
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Computer Operations
Testing the Instrument/PC RS-232 Interface
4
Mn.n identifies the main software version.
An.n identifies the analog-to-digital converter software version.
Dn.n identifies the display software version.
Ln.n identifies the programmable gate-array configuration version.
6. Other commands can be entered from the PC to gain familiarity with the instrument
command set. All commands are summarized in Table 4-4 and explained in Table 4-
5.
For example: to reset the instrument, configure channel 0 to measure volts dc using
the 300V DC scale (scale 4), send scan results to the RS-232 port, and scan once,
enter the following:
*RST[Resets the instrument (which does not affect the communication parameters)]
=>
FUNC 0, VDC, 4[Set channel 0 to volts dc and scale 4 (300V DC)]
=>
PRINT_TYPE 0,0[Sets the data destination as the RS-232 port, and all data]
=>
PRINT 1[Enables data logging to the RS-232 port]
=>
*TRG [Triggers a single scan]
=>
15:17:0407/21/94
0:000.00 VDC
ALM:15DIO:255TOTAL:0
To decode the printout, see Figure 5-3.
The commands in the above example can be combined into a single entry by using
the semicolon separator character:
*RST;FUNC 0,VDC,4;PRINT_TYPE 0,0;PRINT 1;*TRG.
7. One of the following three possible prompts are returned when a command is sent to
the instrument:
=> The command was executed[Example, PRINT 1].
!> The command was recognized, but not executed [Example, PRINT 3, where only
PRINT 0 and PRINT 1 are legal entries].
?> The command wasn’t recognized [Example, PRITN 1, spelling error].
8. Exit Windows and return to DOS, as required.
Testing the RS-232 Interface Using Terminal Emulation (Generic)
Complete the procedure below to test the RS-232 link between the PC and instrument
using a generic terminal emulator. Refer to the documentation appropriate to the selected
communications/terminal emulation software, as required. Identify the PC COM port
used for the RS-232 link (COM1 is assumed).
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1. Configure the Data Bucket communication parameters, as described in Figure 4-2,
for bAUd = 9600, PAR = no, CtS = OFF, and Echo = On.
2. Turn on the PC, start the communications software, and open the COM port
configuration screen.
3. Select the following communications parameters
Connector COM1 [Typical]
Baud Rate 9600
Data Bits 8
Stop Bits 1
Parity None
Flow ControlNone[May be called the RTS/CTS line]
4. In Terminal, request the Data Bucket to send its identification number by entering:
*IDN? <Enter>. If *IDN? did not appear on the screen as the characters were
entered, be sure the instrument RS-232 port is configured for Echo = On (Figure 4-
2). If the wrong characters appear, there is an incompatibility in the COM port
configurations (baud rate, parity, etc.). If everything seems normal, but characters
still don’t appear, check the RS-232 connection cable (see Appendix D). When the
RS-232 link is operating correctly, the instrument returns an identification string and
execution prompt similar to the following:
FLUKE,2635A,0,Mn.n An.n Dn.n Ln.n
=>
Mn.n identifies the main software version.
An.n identifies the analog-to-digital converter software version.
Dn.n identifies the display software version.
Ln.n identifies the programmable gate-array configuration version.
5. Other commands can be entered from the PC to gain familiarity with the instrument
command set. All commands are summarized in Table 4-4 and explained in Table 4-
5.
For example: to reset the instrument, configure channel 0 to measure volts dc using
the 300V DC scale (scale 4), send scan results to the RS-232 port, and scan once,
enter the following:
*RST [Resets the instrument (which does not affect the communication parameters)]
=>
FUNC 0, VDC, 4 [Set channel 0 to volts dc and scale 4 (300V DC)]
=>
PRINT_TYPE 0,0 [Sets the data destination as the RS-232 port, and all data]
=>
PRINT 1 [Enables data logging to the RS-232 port]*TRG [Triggers a single scan]
=>
15:17:04 07/21/94
0: 000.00 VDC
4-8
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Computer Operations
Testing the Instrument/PC RS-232 Interface
4
ALM:15 DIO:255 TOTAL:0
To decode the printout, see Figure 5-3.
The commands in the above example can be combined into a single entry by using
the semicolon separator character:
*RST;FUNC 0,VDC,4;PRINT_TYPE 0,0;PRINT 1;*TRG.
6. One of the following three possible prompts are returned when a command is sent to
the instrument:
=>
!>
The command was executed [Example, PRINT 1].
The command was recognized, but not executed [Example, PRINT 3, where
only PRINT 0 and PRINT 1 are legal entries].
?>
The command wasn’t recognized [Example, PRITN 1, spelling error].
7. Exit the communications program and return to DOS, as required.
Testing the RS-232 Interface Using Gwbasic
Complete the procedure below to test the RS-232 link between the PC and instrument
using GWBASIC interpreter commands. Identify the PC COM port used for the RS-232
link (COM1 is assumed).
1. Configure the Data Bucket communication parameters, as described in Figure 4-2,
for bAUd = 9600, PAR = no, CtS = OFF, and Echo = On.
2. Turn on the PC and enter GWBASIC to start the BASIC interpreter.
3. With the entry screen displayed, enter the following commands (which are executed
immediately). The last command returns an identification string and execution
prompt:
OPEN "COM1,9600,N,8,1,CS,CD" FOR RANDOM AS #1
OK
PRINT #1, "*IDN?"
OK
PRINT INPUT$ (46, #1)
IDN?
FLUKE,2635A,0,Mn.n An.n Dn.n Ln.n
=>
Mn.n identifies the main software version.
An.n identifies the analog-to-digital converter software version.
Dn.n identifies the display software version.
Ln.n identifies the programmable gate-array configuration version.
If the identification string was not returned, be sure the instrument RS-232 port is
configured for Echo = On (Figure 4-2). Verify that the commands were exact. For
example, entering PRINT #1, "*IDN" instead of PRINT #1, "*IDN?" will hang up
the program. Press <CNTL><BREAK> to escape, then re-enter the commands. If
the wrong characters appear, there is an incompatibility in the COM port
configurations (baud rate, parity, etc.). If everything seems normal, but characters
still don’t appear, check the RS-232 connection cable (see Appendix D).
4-9
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2635A
Users Manual
One of the following three possible prompts are returned when a command is sent to
the instrument:
=>
!>
The command was executed [Example, PRINT 1].
The command was recognized, but not executed [Example, PRINT 3,
where only PRINT 0 and PRINT 1 are legal entries].
?>
The command wasn’t recognized [Example, PRITN 1, spelling error].
4. Other commands can be entered from the PC to gain familiarity with the instrument
command set. All commands are summarized in Table 4-4 and explained in Table 4-
5. For example: to reset the instrument, configure channel 0 to measure volts dc
using the 300V DC scale (scale 4), send scan results to the RS-232 port, and scan
once, enter the following [only the output of the last command is shown]:
PRINT #1, "*RST":PRINT INPUT$(10, #1)
PRINT #1, "FUNC 0, VDC,4":PRINT INPUT$(18, #1)
PRINT #1, "PRINT_TYPE 0,0":PRINT INPUT$(20, #1)
PRINT #1, "PRINT 1":PRINT INPUT$(13, #1)
PRINT #1, "*TRG":PRINT INPUT$(83, #1)
15:17:0407/21/94
0:000.00 VDC
ALM:15DIO:255TOTAL:0
To decode the printout, see Figure 5-3.
The commands in the above example can be combined into a single entry by using
the semicolon separator character:
PRINT #1, "*RST;FUNC 0,VDC,4;PRINT_TYPE 0,0;PRINT 1;*TRG":PRINT
INPUT$(124, #1)
If other commands are entered, remember that the input character count xxx for
PRINT INPUT$(xxx, #1) command must be exact. A number too small will not read
all the characters and will leave residual characters in the buffer, while a number too
big will "hang up" the command until more characters are loaded into the buffer or
<CNTL><BREAK> is pressed, which erases the buffer.
5. Enter SYSTEM to exit GWBASIC and return to DOS.
Testing the RS-232 Interface Using Qbasic
Complete the procedure below to test the RS-232 link between the PC and instrument
using QBASIC compiler commands. Identify the PC COM port used for the RS-232 link
(COM1 is assumed).
1. Configure the Data Bucket communication parameters, as described in Figure 4-2,
for bAUd = 9600, PAR = no, CtS = OFF, and Echo = On.
2. Turn on the PC and enter QBASIC to start the BASIC compiler.
3. With the entry screen displayed, enter the following commands (which are not
executed immediately):
OPEN "COM1,9600,N,8,1,CS,CD" FOR RANDOM AS #1
PRINT #1, "*IDN?"
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Computer Operations
Testing the Instrument/PC RS-232 Interface
4
PRINT INPUT$(46, #1)
4. Enter SHIFT<F5> to run the program entered in step 3.If the RS-232 interface is
operating correctly, the instrument returns an identification string and execution
prompt similar to the following:
*IDN?
FLUKE,2635A,0,Mn.n An.n Dn.n Ln.n
=>
Mn.n identifies the main software version.
An.n identifies the analog-to-digital converter software version.
Dn.n identifies the display software version.
Ln.n identifies the programmable gate-array configuration version.
If the identification string was not returned, be sure the instrument RS-232 port is
configured for Echo = On (Figure 4-2). Verify that the commands were exact. For
example, entering PRINT #1, "*IDN" instead of PRINT #1, "*IDN?" will hang up
the program. Press <CNTL><BREAK> to escape, then re-enter the commands. If
the wrong characters appear, there is an incompatibility in the COM port
configurations (baud rate, parity, etc.). If everything seems normal, but characters
still don’t appear, check the RS-232 connection cable (see Appendix D).
One of the following three possible prompts are returned when a command is sent to
the instrument:
=>
!>
The command was executed [Example, PRINT 1].
The command was recognized, but not executed [Example, PRINT 3,
where only PRINT 0 and PRINT 1 are legal entries].
?> The command wasn’t recognized [Example, PRITN 1, spelling error].
5. Other commands can be entered from the PC to gain familiarity with the instrument
command set. All commands are summarized in Table 4-4 and explained in Table 4-
5. For example: to reset the instrument, configure channel 0 to measure volts dc
using the 300V DC scale (scale 4), send scan results to the RS-232 port, and scan
once, enter the following, then enter SHIFT<F5> to run [only the output of the last
command is shown]:
PRINT #1, "*RST":PRINT INPUT$(10, #1)
PRINT #1, "FUNC 0, VDC,4":PRINT INPUT$(18, #1)
PRINT #1, "PRINT_TYPE 0,0":PRINT INPUT$(20, #1)
PRINT #1, "PRINT 1":PRINT INPUT$(13, #1)
PRINT #1, "*TRG":PRINT INPUT$(83, #1)
15:17:0407/21/94
0:000.00 VDC
ALM:15DIO:255TOTAL:0
To decode the printout, see Figure 5-3.
The commands in the above example can be combined into a single entry by using
the semicolon separator character:
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2635A
Users Manual
PRINT #1, "*RST;FUNC 0,VDC,4;PRINT_TYPE 0,0;PRINT 1;*TRG":PRINT
INPUT$(124, #1)
If other commands are entered, remember that the input character count xxxfor
PRINT INPUT$(xxx, #1)command must be exact. A number too small will
not read all the characters and will leave residual characters in the buffer, while a
number too big will "hang up" the command until more characters are loaded into
the buffer or <CNTL><BREAK> is pressed, which erases the buffer.
6. Use Exit to exit QBASIC and return to DOS.
Computer Interface Commands and Operation
Operation of the computer interface between the instrument and PC normally involves
the application software Starter (supplied) and Logger (optional), described in separate
manuals. This chapter is provided for the user who wishes to develop his own software
interface using the instrument command set. The topics in this chapter include:
•
•
•
•
•
•
•
How the Instrument Processes Input
Input Terminators
Input String Examples
Sending Numeric Values to the instrument
How the Instrument Processes Output
Status Registers
Computer Interface Command Set
How the Instrument Processes Input
The instrument processes and executes valid input character strings from the host
personal computer (PC). A valid input string is one or more syntactically correct
commands, separated by semicolons (;) followed by an input terminator. The instrument
stores received inputs in a 350-byte buffer. When an input string is received, it is not
executed or checked for proper syntax until the input terminator is received. If the 350-
byte input buffer becomes full, a device-dependent error prompt is returned, and further
inputs to the string are ignored, except for a termination character. The instrument
accepts alphabetic characters in either upper- or lower-case. If a command cannot be
understood, the command and the rest of the command line are ignored.
Commands must be entered in the correct order as follows:
1. Commands to configure the instrument.
2. Commands that trigger a measurement.
3. Commands to read the results of a triggered measurement.
4. Commands to reconfigure the instrument (if any).
Input Terminators
An input terminator is a character sent by the host that identifies the end of a string.
When the input terminator is received, the instrument executes all commands entered
since the last terminator was received, on a first-in, first-out basis. If a communications
error (e.g., parity, framing, overrun) is detected, a device-dependent error is generated.
Valid terminators are LF (line feed), CR (carriage return), CR LF, and LF CR. In some
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Computer Operations
Computer Interface Commands and Operation
4
instances, a terminator is automatically transmitted by the host at the end of the
command string, for example, commands entered in BASIC.
Input String Examples
Below are four input string examples. Example 1 - Select function for channel 1 as
ohms, 30-k range, 2-wire connection.
FUNC 1, OHMS, 3, 2 <CR/LF>
Example 2 - Select function for channel 12 as temperature, using K-type thermocouple.
FUNC 12, TEMP, K <CR/LF>
Example 3 - Select function for channel 7 as temperature, using platinum RTD, 2-wire
connection -and- set a new R0 [0 as in zero] value on the same channel of 101.22.
FUNC 7, TEMP, PT, 2;RTD_R0 7, 101.22 <CR/LF>
Example 4 - Set the interval between scans to 10 minutes -and- start scanning -and-
return the most recent measurement values for all scanned channels.
INTVL 0, 10, 0;SCAN 1;LAST? <CR/LF>
Sending Numeric Values to the Instrument
Numeric values can be sent to the instrument as integers, real numbers, or real numbers
with exponents, as shown in the following examples:
+12345Sends the signed integer+12345
123.45Sends the real number123.45
1.2345E+2Sends the number -1.2345 x 102
How the Instrument Processes Output
The instrument outputs alphanumeric character strings in response to a query command
from the host. A query command always ends with "?" (see Tables 4-4 and 4-5). An
instrument output string is terminated by a CR/LF (carriage return/line feed). When the
host sends a string to the instrument, wait for the instrument to return a prompt before
sending another command string. If a second command is sent before the prompt is
returned, a device-dependent command error (!>) is generated and the second string is
ignored. The prompts are in one of three forms:
=>
The command was executed.
[Example, PRINT 1]
!>
The command was recognized but couldn’t be executed.
[Example, PRINT 3, which has no meaning]
?> The command was not recognized due to syntax error.
[Example, PRITN 1, spelling error]
Numeric outputs from the instrument are either integer values or scientific notation
values. For example:
The query command RANGE? returns the number 3.
The query command ALARMS? returns the number 0.
A measurement returns +1.2345E+6 (1.2345x106).
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Users Manual
Positive overload (OL on display) returns +001.00E+9
Negative overload (-OL on display) returns -001.00E+9
Open thermocouple (otc on display) returns +009.00E+9
Status Registers
Internal instrument operation is summarized in three data registers, which can be
accessed to determine various events and status conditions before, during, and after
instrument operation. Each register has a corresponding enable register to enable or
mask (disable) any or all data register outputs. The relationship between the three
registers is shown in Figure 4-3.
Instrument Event Register (IER)
The inputs to the Instrument Event Register (IER) include Scan Complete, Configuration
Corrupted, Calibration Corrupted, Open Thermocouple, Totalize Overflow, and Alarm
Limit Transition. Each input is described in Table 4-1. The output byte of the IER is
ANDed with the output byte of the corresponding Instrument Event Enable Register
(IEE). When there is logic high correlation between any of the bits of the IER and IEE
registers, the associated Logical OR gate will output a logic high to the Instrument Event
Bit (IEB) in the Status Byte Register.
4-14
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4
Scan Complete
CofigurationCaCloibrrautpiotendOCpoerrnupTtheedrmTotcaoliuzpeleOvAelraflromwLimit Transition
Device Dependent Error
Query Error
OperationSCotmapnletde ard
Event Status
Register
Read Using *ESR?
(Read Erases
Contents)
Power Transition
Execution Error
Command Error
Instrument
Event
Register
6
2
7
5 4 3
1
0
6
2
7
5 4 3
1
0
Read Using IER?
(Read Erases
Contents)
&
&
&
&
&
&
&
&
&
&
&
2
&
2
&
1
&
1
&
0
&
0
Standard
Event Status
Enable
Instrument
Event Enable
Register
6
7
5 4 3
6
7
5 4 3
Register
Read Using IEE?
Write Using IEEE
Read Using *ESE?
Write Using *ESE
Queue
Not-Empty
Output Queue
MSS ESB MAV IEB
*STB
(64) (32) (16)
(1)
(DECIMAL)
Status Byte
Register
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
IEB
MAV
MSS ESB
2
7
3
1
16
17
32
33
48
49
64
65
80
81
96
97
112
113
Read Using *STB?
&
&
&
&
&
2
&
1
&
0
Service Request
Enable Register
Read Using *SRE?
Write Using *SRE
7
5 4 3
op50f.eps
Figure 4-3. Overview of Status and Event Data Registers
4-15
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For example, an IER byte of binary 10000000 (decimal 128) indicates Scan Complete. If
the IEE register is set to binary 10000000 (using the command IEE 128), then a Scan
Complete condition will cause the Logical OR gate to output a logic high. In a similar
manner, parameters can be combined. An IER byte of binary 10000101 (decimal 133)
and an IEE set to a corresponding binary 10000101 (using the command IEE 133), will
cause the Logical OR gate to have a logic high output for any of three conditions: Scan
Complete -or- Open Thermocouple -or- Alarm Limit Transition.
Other commands include IER?, which returns the decimal equivalent of the IER byte and
then clears the register to zero, and IEE?, which returns the decimal equivalent of the
IEE byte. The command *CLS will clear all event registers. (See Appendix E for an 8-bit
binary-coded-decimal table.)
Table 4-1. Instrument Event Register (IER)
Bit
Name
ALT
Description
0
1
Alarm Limit Transition. Set high (1) when any measurement value has
transitioned into or out of alarm. Alarms are defined through the front
panel or the computer interface (ALARM_LIMIT). This bit is cleared when
read with IER? and when alarms or review values are cleared.
TOB
Totalize Overflow. Set high (1) when the Totalizer overflows (65,535). This
bit is cleared when read with IER? and when the Totalizer is zeroed from
the front panel or set to some other non-overflow value (,65,535) with the
computer interface TOTAL command.
2
3
OTC
CCB
Open Thermocouple. Set high (1) when open thermocouple checking is
enabled (with TEMP_CONFIG command) and any thermocouple channel
is measured with a source impedance greater than 1 to 4 kilohms.
Calibration Corrupted. Set high (1) when the instrument calibration data is
corrupted. When a calibration data check shows a corruption of calibration
data, the calibration alarm bit remains set in the Instrument Status
Register until the instrument is recalibrated.
4
CNC
Configuration Corrupted. the instrument configuration stored in NVRAM
has been found to be corrupted. The RAM CRC is no longer valid.
5,6
7
not used
SCB
Always set to 0.
Scan Complete. Set high (logic 1) when a measurement scan has been
completed. This bit is cleared when read with IER?
NOTES
Whenever the Instrument Event Register is read, the condition bits are cleared.
This register is used in conjunction with the Instrument Event Enable Register to determine the
conditions under which the Instrument Event Bit of the Status Byte is set.
Standard Event Status Register (ESR)
The inputs to the Standard Event Status Register (ESR) include Power On, Command
Error, Execution Error, Device Dependent Error, Query Error and Operation Complete.
Each input is described in Table 4-2. The output byte of the ESR is ANDed with the
output byte of the corresponding Standard Event Status Enable (ESE) register. When
there is logic high correlation between any of the bits of the ESR and ESE registers, the
4-16
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Computer Operations
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4
associated Logical OR gate will output a logic high to the Event Status Bit (ESB) in the
Status Byte Register.
For example, an ESR byte of binary 00010000 (decimal 16) indicates an Execution
Error. If the ESE register is set to binary 00010000 (using the command *ESE 16), then
an Execution Error condition will cause the Logical OR gate to output a logic high. In a
similar manner, parameters can be combined. An ESR byte of binary 00110000 (decimal
48) and an ESE set to a corresponding binary 00110000 (using the command *ESE 48),
will cause the Logical OR gate to have a logic high output for any of two conditions:
Command Error or Execution Error.
Other commands include *ESR?, which returns the decimal equivalent of the ESR byte
and then clears the register to zero, and *ESE?, which returns the decimal equivalent of
the ESE byte. The command *CLS will clear all event registers. (See Appendix E for an
8-bit binary-coded decimal table.)
Table 4-2. Event Status Register (ESR)
Bit
Name
Description
0
OPC
Operation Complete. set true (1) upon execution of the *OPC
command, indicating that the instrument has completed all selected
pending operations
1
2
not used
QYE
Always set to 0.
Query Error. Sets the QYE bit of the ESR. Example would be *IDN?;
*ESR? (vs. *ESR?; *IDN?). This causes the “?>“ prompt to be
returned.
3
4
DDE
EXE
Device Dependent Error. Generated true (1) by overflows of the RS-
232 input buffer or by calibration errors. This causes the “!>“ prompt
to be returned.
Execution Error. Generated true (logic 1) by parameters out of
bounds or by a valid command that could not be processed due to
an internal condition (such as calibration commands being received
when calibration is not enabled). This causes the “!>“ prompt to be
returned.
5
CME
Generated true (1) by syntax errors, including: unrecognized
command and incorrect command sequences. This causes the "?>"
prompt to be returned.
6
7
not used
PON
Always set to 0
Power Transition. Set true (logic 1) after an off-to-on transition has
occurred in the instrument’s power supply.
Status Byte Register (STB)
The inputs to the Status Byte Register (STB) include the Instrument Event Bit, Event
Status Bit, and Message Available Bit. In addition, the STB register generates a Master
Summary Status. Each input is described in Table 4-3. The output byte (except for bit 6)
is ANDed with the output byte of the corresponding Service Request Enable Register
(SRE). When there is a logic high correlation between any of the bits of the STB and
SRE registers, the associated Logical OR gate will output a logic high that is used as a
Master Summary Status (MSS) bit.
4-17
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For example, an STB byte of binary 00100000 (decimal 32) indicates an Event Status
Bit. If the SRE register is set to binary 00100000 (using the command *SRE 32), then an
Event Status Bit will cause the Logical OR gate to output a logic high, which
automatically sets bit 6 to high via the MSS input. Therefore, a query of the STB register
(command *STB?) would return decimal 96 (binary 01100000).
Other commands include *SRE?, which returns the decimal equivalent of the SRE byte.
The command *CLS will clear all event registers. (See Appendix E for an 8-bit binary-
coded decimal table.)
Table 4-3. Status Byte Register (STB)
Bit
Name
IEB
Description
0
Instrument Event Bit. When any bit in the Instrument Event Register is set and
the corresponding mask bit(s) in the Instrument Event Enable register is set,
this Instrument Event Bit in the Status Byte will be set.
When read, the Instrument Event Bit is recomputed based on the new value
from the Instrument Event Register and its mask, the Instrument Event Enable
Register.
1,2,3
not used
MAV
ESB
MSS
not used
Always set to 0.
Message Available (ASCII bytes available for output).
Event Status Bit
Master Summary Status
Always set to 0.
4
5
6
7
Computer Interface Command Set
Table 4-4 is a summary of computer interface commands and queries. A detailed
description of each command or query, with examples, can be found in Table 4-5.
Sample programs that use the command set are shown in Figure 4-4 (GWBASIC),
Figure 4-5 (QBASIC) and Figure 4-6 (Quick C). Program examples are provided on the
Starter application software floppy disk.
Xmodem File Transfers
The FILE_TX and FILE_RX computer commands are used to transfer memory card files
in binary format over the RS-232 interface. The protocol implemented for file transfers
is XMODEM, an 8-bit block-oriented protocol using CRC or checksums for error
checking. When receiving a file, the protocol attempts to do CRCs but will fall back to
checksums if CRCs are not sent. When FILE_TX and FILE_RX are used with terminal
emulators, the emulator must support the XMODEM protocol; for example, the PC
Windows terminal emulator. The PC software must support both 128-byte and 1024-byte
data blocks. Since XMODEM is an 8-bit protocol, no parity must be selected when
configuring the RS-232 ports and XON/XOFF flow control cannot be used.
When a FILE_TX or FILE_RX command is issued, it returns an immediate execution
error prompt (!>) if the file transfer can not be initiated. If this prompt is not returned,
then the XMODEM transfer may begin (refer to the communications software being
used for the procedure to send or receive a binary file). When the file transfer is
complete, the => prompt is returned. If an unrecoverable error occurred, the !> prompt is
returned. As with any XMODEM transfer, the last block received, if it is not an even
multiple of 128 or 1024 bytes, is padded with nulls. See the FILE_RX and FILE_TX
commands in Table 4-5 for more information.
4-18
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4
Table 4-4. Command and Query Summary
Alarms
ALARMS?
Active Alarms Query
ALARM_ASSOC
ALARM_ASSOC?
ALARM_ASSOC_CLR
ALARM_DO_LEVEL
ALARM_DO_LEVELS?
ALARM_LIMIT
ALARM_LIMIT?
Communications
ECHO
Associate Alarm Output
Alarm Association Query
Clear Alarm Association
Set Alarm Output Level
Alarm Output State Query
Set Alarm Limit
Alarm Limit Assignments Query
Turn the RS-232 Echo Mode on and off
Digital I/O
DIO_LEVELS?
DO_LEVEL
Digital I/O State Query
Set Digital Output Level
Function and Range
FUNC
Channel Function Definition
Channel Function Query
RTD Ice Point (R0)
FUNC?
RTD_R0
RTD_R0?
RTD Ice-Point (R0) Query
Channel Range Query
RANGE?
Logging
LOG?
Retrieve Logged Data Query
Scan Data Query
LOGGED?
LOG_BIN?
Binary Upload of Logged Data
Clear Logged Scans
LOG_CLR
LOG_CLR1
Clear Oldest Logged Scan
Logged Scan Count Query
Action when Internal Memory is Full
Action when Internal Memory is Full Query
Data Logging Enable/Disable
Data Logging Query
LOG_COUNT?
LOG_MODE
LOG_MODE?
PRINT
PRINT?
PRINT_TYPE
PRINT_TYPE?
Set Data Logging Type
Data Logging Type Query
4-19
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Table 4-4 Command and Query Summary (cont)
Measurement Rate
RATE
Select Measurement Rate
Measurement Rate Query
RATE?
Measurement Values
LAST?
Channel’s Last Scan Value
Channel’s Maximum Value
Channel’s Minimum Value
Next Scan’s Values
MAX?
MIN?
NEXT?
Memory Card
DIR
Memory Card Files Directory
File Error Query
FILE_ERROR?
FILE_LOAD
FILE_OPEN
FILE_OPEN?
FILE_REMOVE
FILE_RX
Configuration File Load
Data File Open
Data File Open Query
File Remove
File Receive
FILE_SPACE?
FILE_STORE
FILE_TAG?
FILE_TX
File Space Query
Configuration File Store
File Tag Query
File Transmit
MCARD?
Memory Card Status Query
Memory Card Directory Query
Memory Card Format
Memory Card Size Query
MCARD_DIR?
MCARD_FORMAT
MCARD_SIZE?
Monitor
MON
Enable/Disable Monitoring
Monitor Channel Number
Monitor Channel Value
MON_CHAN?
MON_VAL?
Mx+B Scaling
SCALE_MB
SCALE_MB?
Operation Complete
*OPC
Set Mx+B Scaling Values
Mx+B Scaling Values Query
Operation Complete
*OPC?
Operation Complete Query
4-20
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Table 4-4 Command and Query Summary (cont)
Remote/Local
LOCK
Lock/unlock front panel control keys
Returns instrument front panel lock status
Local without Lockout
LOCK?
LOCS
LWLS
Local with Lockout
REMS
Remote without Lockout
RWLS
Remote with Lockout
Reset
*RST
Reset
Response Format
FORMAT
FORMAT?
Review Array
REVIEW_CLR
Status Registers
*CLS
Response Format
Query Response Format
Clear Review Values
Clear Status
*ESE
Event Status Enable
*ESE?
Event Status Enable Query
Event Status Register Query
Instrument Event Enable
*ESR?
IEEE
IEEE?
Instrument Event Enable Query
Instrument Event Register Query
Service Request Enable Register
Service Request Enable Register Query
Read Status Byte Query
IER?
*SRE
*SRE?
*STB?
Scan
INTVL
Set Scan Interval
INTVL?
Scan Interval Query
Enable/Disable Scanning
Return Scan Status
Time of Scan
SCAN
SCAN?
SCAN_TIME?
Temperature Options
TEMP_CONFIG
TEMP_CONFIG?
Temperature Configuration
Temperature Configuration Query
4-21
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Table 4-4 Command and Query Summary (cont)
Test/Identification
*IDN?
Identification Query
Selftest Query
*TST?
Time/Date
DATE
Set Instrument Date
TIME
Set the instrument Time
Retrieve Time and Date
TIME_DATE?
Totalizer
TOTAL
Set Totalizer Count
TOTAL?
TOTAL_DBNC
TOTAL_DBNC?
Triggering
*TRG
Totalizer Value Query
Set Totalizing Debounce
Totalizer Debounce Query
Single-Scan Trigger
Select Trigger Type
Trigger Type Query
TRIGGER
TRIGGER?
Wait
*WAI
Wait-to-Continue
4-22
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Table 4-5. Command and Query Reference
<CNTL><C>
*CLS
Abort Command
Stops execution of command
Clear Status
Clears all event registers (ESR, (IER) summarized in the status byte.
Event Status Enable
*ESE
Sets the Event Status Enable Register to the given value.
*ESE <value>
<value>
=
(0 .. 255)
The ESE register is used to enable or mask the output bits of the Standard
Event Status Register (ESR). The ANDed output of the ESE and ESR is
the Event Status Bit (ESB), which is used as an input for the Status Byte
Register. See the previous discussion on status registers for more
information.
Example: *ESE 176 [Enables the ESR byte 10110000 (decimal 176),
which means the ESB will be set logic high by a Power Transition -or-
Command Error -or- Execution Error.]
*ESE?
Event Status Enable Query
Returns an integer representing the present value of the Event Status
Enable Register, as selected with the *ESE command. See the previous
discussion on status registers for more information.
Example: *ESE? returns 160 [the ESE register is set for 10100000
(decimal 160), which means the Event Status Bit (ESB) will be set logic
high by a Power Transition -or- Command Error]
*ESR?
Event Status Register Query
Returns the value of the Standard Event Status Register (ESR) as an
integer, then clears the register to 0. See the previous discussion on status
registers for more information.
Example: *ESR? returns 48 [The ESR register is set for 00110000
(decimal 48), which means a Command Error and Execution Error were
detected since last queried.]
4-23
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Table 4-5. Command and Query Reference (cont)
*IDN?
Identification Query
Returns the instrument identification code.
The identification code consists of four descriptive fields separated by
commas. Note that commas are reserved as field separators and cannot
be used within the fields.
FIELD
DESCRIPTION
1
2
3
4
Manufacturer’s name (FLUKE).
Instrument model number (2620A or 2625A).
0
Firmware revision levels.
This query must be the last query on the input line, otherwise a query error
is generated. It is legal to follow this query with other commands.
Example: *IDN? returns FLUKE, 2635A, 0, M6.E A4.7 D1.L1.6 {Fluke
product 2645A is running the main software version M6.2, Analog-to-
Digital Converter software version A4.7, display software version D1.0,
and programmable gate-array version L1.6.]
*OPC
Operation Complete
Causes the instrument to generate an Operation Complete when parsed.
Operation Complete Query
*OPC?
Causes the instrument to place an ASCII 1 in the output queue when
parsed.
*RST
Reset
Performs a Configuration Reset. The RS-232 computer interface
parameters are not changed, and the temperature unit (°C or °F) is not
changed.
*SRE
Service Request Enable
Sets the Service Request Enable Register to the given value.
*SRE <value>
<value> = (0 .. 255)
The SRE register is used to enable or disable (mask) the output bits of the
Status Byte Register (STB). The ORed output of the SRE and STB is the
Master Summary Status (MSS) bit, which is used to signal the selected
status bits have been set. See the previous discussion on status registers
for more information. Note that bit 6 cannot be configured, and bits 1, 2, 3,
and 7 are not used.
Example: *SRE 49 [Enables the STB byte 00110001 (decimal 49), which
means the MSS bit is set logic high by an IEB bit -r-MAV bit -or- ESB bit.]
Service Request Enable Query
*SRE?
Returns the integer value of the Service Request Enable Register (SRE).
See the discussion on status registers for more information.
Example: *SRE? returns 32 [The SRE register is set for 00100000
(decimal 32), which means the Master Summary Bit will be set logic high
when the ESB bit is set logic high.]
4-24
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4
Table 4-5. Command and Query Reference (cont)
*STB?
Read Status Byte Query
Returns the integer value of the Status Byte, with bit 6 as the master
summary bit. See the previous discussion on status registers for more
information.
Example: *STB returns 97 [The STB register is set for 01100001
(decimal 97), which means the Master Summary Bit, Even Status Bit, and
instrument Even Bit are set logic high.]
*TRG
Single- Scan Trigger
This command causes the instrument to perform a Single Scan. If a scan
is already in progress when this command is parsed, the command is
ignored.
If logging to memory card is enabled (PRINT_TYPE 3 or 6) and the
memory card is missing, full, write-protected, or unformatted, the scan will
be performed but an Execution error will be generated.
*TST?
Self Test Query
Causes an internal self test to be run, returning the result as an integer
(representing the binary encoded value.) The self test does not require any
local operator interaction and returns the instrument to the power-up state.
The binary coding is:
Bit
Binary Value
Error
0
1
Boot ROM Checksum Error1
1
2
2
4
Instrument ROM Checksum Error
Internal RAM Test Failed
3
4
8
16
Display Power-Up Test Failed
Display Bad or Not Installed
5
6
7
8
32
64
Instrument Configuration Corrupted.
Instrument Calibration Data Corrupted
Instrument Not Calibrated
A-to-D Converter Not Responding
A-to-D Converter ROM Test Failed
A-to-D Converter RAM Test Failed
A-to-D Converter Self test Failed
Memory Card Interface Not Installed
128
256
512
1024
2048
4096
9
10
11
12
Example: *TST? returns 2048 [The A/D self test failed.]
Wait-to-continue
*WAI
Prevents the parser from executing any more commands or queries until
the No-Pending-Operations flag is true. Used in conjunction with *OPC
and *OPC?
4-25
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Table 4-5. Command and Query Reference (cont)
ALARMS?
Active Alarms Query
Returns alarm status for a single scanned channel, or alarm status for all
scanned channels.
ALARMS? <channel>
<channel> = (0 .. 20) or leave blank
The values returned represents data from the most recent scan, whether
scanning is active or note. The integers returned indicated the alarms
condition as follows:
0
1
2
3
neither limit is in alarm and/or alarm(s) not defined
Limit "1" in alarm
Limit "2" in alarm
Limit "1" and Limit "2" in alarm
For a single scanned channel, use ALARMS? <channel>. Return data for
a single scanned channel consists of a single integer, as defined above.
An Execution Error results if a request is made for a channel defined as
OFF, the channel specified is invalid, no scan measurements have been
made or are being made, or values have been cleared by REVIEW_CLR
or by changing any parameter on any channel.
For all canned channels, use ALARMS?. Return data for all scanned
channels is a string of integers, separated by commas. The first digit
represents the alarm status of the lowest channel scanned, and the last
digit represents the alarm status of the highest channel scanned.
Example: ALARMS? 5 returns 1 [Channel 5 is in Limit 1alarm.]
Example: ALARMS? returns 0,2,3,0,1,1, [Six channels were scanned. The
first has no alarm or alarms were not defined, the second has a Limit 2
alarm, the third has both Limit 1 and Limit 2 in alarm, the fourth has no
alarm or alarms were not defined, the fifth and sixth have a Limit 1 alarm.]
4-26
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4
Table 4-5. Command and Query Reference (cont)
ALARM_ASSOC
Associate Alarm Output
Configures alarm output associations at the rear panel DIGITAL I/O
connector for channels 4 to 20.
ALARM_ASSOC <channel>,<limit_num>,<DO_line>
<channel>
= (4 .. 20)
<limit_num> = 1 or 2
<DO_line> = (0 .. 7)
This command is used to associate a channel alarm for channels 4 to 20
with a rear panel DIGITAL I/O line (I/O 0 to I/O 7). Alarm conditions are
asserted with a logical low (nominal =0.7V DC); non-alarm conditions are
indicated by a logical high (nominal =5.0V DC). The default setting for 4 to
20 are ORed to the I/O lines in groups, as shown below.
I/O 4
Chan
4
I/O 5
Chan
5
I/O 6
Chan
6
I/O 7
Chan
7
8
9
10
11
12
13
14
15
16
17
18
19
20
For example, if channel 6 or 10 0r 14 0r 18 goes into alarm (either Limit 1
or Limit 2), I/O 6 is asserted. This command changes the default settings
or any other settings, as desired. Any number of channel alarm limits can
be assigned to the same I/O line. For example, all alarms on all channels 4
to 20 could assert a single I/O line. Alarm associations can be returned to
the default settings with an *RST configuration reset command. DIGITAL
I/O lines set logic low remain low unless values have been cleared by a
new alarm association, REVIEW_CLR, or by changing any parameter on
any channel. If this command is entered during scanning while logging to
the memory card, an Execution Error is generated.
Example: ALARM_ASSOC 10,1,2 [For channel 10, alarm Limit 1, assert
DIGITAL I/O line 2].
4-27
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Table 4-5. Command and Query Reference (cont)
ALARM_ASSOC?
Alarm Association Query
Returns alarm output associations at the rear panel DIGITAL I/O connector
for channels 4 to 20.
ALARM_ASSOC?
<channel>,<limit_num>
<channel>
= (4 .. 20)
<limit_num> = 1 or 2
This command returns an integer that represents the DIGITAL I/O line
active at the rear panel DIGITAL I/O connector for the specified channel
and alarm limit. If default settings are in effect, returns follow the table
below.
I/O 4
Chan
4
I/O 5
Chan
5
I/O 6
Chan
6
I/O 7
Chan
7
8
9
10
11
12
13
14
15
16
17
18
19
20
If there is no association between an alarm and DIGITAL I/O line, there is
no return and an Execution Error is generated.
Example: ALARM_ASSOC? 10,1 returns 2 [For channel 10, alarm Limit 1,
will assert DIGITAL I/O line 2].
ALARM_ASSOC_CLR
Clear Alarm Association
Clears an alarm output association at the rear panel DIGITAL I/O
connector for channels 4 to 20.
ALARM_ASSOC_CLR <channel>,<limit_num>
<channel>
= (4 .. 20)
<limit_num> = 1 2
This command removes all association between a DIGITAL I/O line at the
rear panel DIGITAL I/O connector for the specified channels 4 to 20 and
alarm limit. After application of this command, the previously associated
DIGITAL I/O line is set high and new alarm conditions on this channel’s
alarm limit will not assert the DIGITAL I/O line. If this command is entered
during scanning while logging to the memory card, and Execution Error is
generated.
Example: ALARM_ASSOC>CLR 10,1 [Channel 10, alarm Limit 1, remove
all association with a DIGITAL I/O line.]
4-28
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4
Table 4-5. Command and Query Reference (cont)
ALARM_DO_LEVEL
Alarm Digital Output Level
Configures rear panel ALARM OUTPUTS lines for I/O functions.
ALARM_DO_LEVEL <DO_line>,<DO_state>
<DO_line> = (0 .. 3)
<DO_state> = 1 (high) 0 (low)
The rear panel ALARM OUTPUTS lines 0 to 3 are hard-wired to output
alarm conditions for channels 0 to 3, respectively. If all or some of
channels 0 to 3 are not configured for alarm outputs, the associated
ALARM OUTPUTS line can be assigned to go logic high or low with this
command. The line may be set to a logical low. (nominal =0.7V DC), or set
to a logical high (nominal =5.0V DC).
Example: ALARM_DO_LEVEL 3,0 [Set ALARM OUTPUTS line 3 to a
logical 0.]
ALARM_DO_LEVELS?
Alarm Output State Query
Returns an integer between 0 and 15 that summarizes the logical state of
the rear panel ALARM OUTPUTS lines 0 to 3. Since the lines can be used
as alarm outputs or DIGITAL I/O functions, the query represents the actual
conditions at time of query. There are 16 possibilities, as shown below (0 =
logic low):
Line Line Line Line Returned
3
2
1
0
Integer
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0 -(all 4 alarms active)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 -(no alarms active)
Example: ALARM_DO_LEVELS? returns 15 [All lines are logic high.]
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Table 4-5. Command and Query Reference (cont)
ALARM_LIMIT
Alarm Limit
Set alarm limit 1 or 2 for any channel 0 to 20.
ALARM_LIMIT <channel>,<limit_num>,<sense>,<value>
<channel>
= (0 .. 20)
<limit_num> = 1 2
<sense>
<value>
= HI LO OFF
= Signed numeric quantity
Two alarm limits, Limit 1 and Limit 2, can be assigned to any channel 0 to
20 that is not in the OFF mode. An alarm limit can be used for high alarms,
meaning a HI alarm is set if a measurement exceeds the high alarm level,
or low alarms, meaning a LO alarm is set if a measurement falls below the
low alarm level. If only one of the alarms is used, the other alarms is
turned OFF. The alarm value can be any signed number between
.00000001 and 9999999, however, the instrument rounds to five significant
digits. The signed numeric entries can be entered in scientific notation or
as real numbers. If no polarity sign is used, the value is assumed to be
positive. Alarm limit settings automatically clear from a channel if the
channel function is changed. If Mx+B scaling is applied, alarm settings are
based on scaling, i.e., the actual instrument display, if this command is
entered during scanning while logging to the memory card, an Execution
Error is generated. Setting an alarm limit clears its alarm status and sets
any associated ALARM or DIGITAL I/O line high.
Example: ALARM_LIMIT 5, 1, LO, -65.872 [For channel 5, configure alarm
Limit 1 as a low alarm with a value of -65.872.]
ALARM_LIMIT?
Alarm Limit Assignments Query
Return alarm limit 1 or alarm limit 2 for any channel 0 to 20.
ALARM_LIMIT? <channel>,<limit_num>
<channel>
= (0 .. 20)
<limit_num> = 1 2
For a selected channel and alarm limit, the returns include the sense of the
alarm limit (HI, LO, OFF) plus the value of the alarm setting in scientific
notation with five digits of resolution.
Example: ALARM_LIMIT? 13, 1 returns LO, -4.5500E+0 [Channel 13,
alarm Limit 1 is configured as a low alarm with a value of -4.55.]
*CLS
Clear Status
(See front of table.)
Set Date
DATE
Set instrument calendar values.
DATE <month>,<date>,<year>
<month> = (1 .. 12)
<date> = (1 .. 31)
<year> = (00 .. 99)
Invalid values generate an Execution Error.
Example: DATE 7,21,94 [Set date for July 21, 1994.]
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4
Table 4-5. Command and Query Reference (cont)
DIO_LEVELS? Digital I/O State Query
Returns an integer between 0 and 255 that summarizes the logical state of the rear
panel DIGITAL I/O lines 0 to 7. A logical 0 (low) means the line is asserted. Since the
lines can be used as alarm outputs of digital inputs or outputs, the return represents the
actual conditions at time of query. There are 256 possibilities, as shown in Appendix E.
Example: DIO_LEVELS? returns 145 [DIGITAL I/O lines 1, 2, 3, 5 and 6 are asserted
(logic low).]
DIR
Memory Card Files Directory
Print a formatted listing of files on the memory card. This includes number of files, bytes
used, and bytes free. While the directory is printing, all other operations in the
instrument are suspended. If hardware or software flow control stall this output, the
instrument waits for the output to be unstalled.
Example; DIR returns:
DAT00.HYD 826
DAT01.HYD 1082
SET00.HYD 730
SET01 HYD 730
07-21-1994
07-21-1994
07-21-1994
07-21-1994
16:20
16:50
17:10
18:30
4 FILE (S)
3368 BYTES
1030656 BYTES FREE
DO_LEVEL
Set Digital Output Level
Configures the eight rear panel DIGITAL I/O connector lines, I/O connector lines, I/O 0
to I/O 7.
DO_LEVEL <DO_line>,<DO_state>
<DO_line>
<DO_state>
=
=
(0 .. 7)
1 0
The rear panel DIGITAL I/O connector has eight lines, 0 to 7. Each line can be assigned
to an I/O function. With this command, the line may be set to a logical low (nominal
+0.7V DC), or set to a logical high (nominal +5.0V DC). DIGITAL I/O lines are asserted
while scanning. When scanning stops, the I/O lines set logic low remain low unless
values have been cleared by a new DO_LEVEL command, REVIEW_CLR, or by
changing any parameter on any channel. Since I/O lines are shared with the alarm
outputs of channels 4 to 20, verify DO_LEVEL commands will not cause ambiguities.
(See the ALARM_ASSOC_CLR command to disassociate an alarm with an I/o line.) If
this command is entered during scanning while logging to the memory card, an
Execution Error is generated.
Example: DO_LEVEL 4, 0 [Set I/o line 4 to a logical 0 (low).]
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Table 4-5. Command and Query Reference (cont)
Enable/Disable RS-232 Echo Mode
ECHO <1 0>
ECHO
1 = Turn RS-232 echoing on.
0 = Turn RS-232 echoing off.
The echo on mode allows character strings sent from the host to the
instrument, to return (echo) back to the host. When operating the
instrument from a terminal (or computer in the terminal emulation mode),
ECHO 1 is usually selected. If this command is entered during scanning
while logging to the memory card, an Execution Error is generated.
*ESE
Event Status Enable
(See front of table.)
Event Status Enable Query
(See front of table.)
Event Status Enable Query
(See front of table.)
File Error Query
*ESE?
*ESR?
FILE_ERROR?
Returns an integer number representing the last memory card error that
was encountered. Once set, this value is only cleared (set to zero) by
performing this query.
The possible card error codes are:
0
No error since last queried or power up.
Card error. No card, invalid file system on card, no file system on card,
format operation failed, file could not be removed, and all other I/O
errors.
Bad file name, or out of file names (all 100 file names of the type being
operated on are in used).
Card error during scanning, but no data has been lost. Usually occurs
when card fills during scanning.
Card error during scanning, and data is being lost. The oldest scan data in
queue is being lost as each new scan completes.
Configuration File Load
FILE_LOAD
Loads the instrument configuration from a memory card configuration or
data file.
FILE_LOAD
<file> = SET00.HYD, SET01.HYD, ... SET99.HYD
-or-
<file>
<file> = DAT00.HYD, DAT01.HYD, ... DAT99.HYD
Execution error if the file does not exist, if the file is not an instrument
configuration or data file, if the file name is not valid, the card is not
installed, or the card is not formatted. An execution error is also generated
if either scanning or monitor is active. The file name convention is not
checked (a data file may be loaded to recover a configuration).
Example: FILE_LOAD SET68.HYD [Loads configuration file SET68.HYD
as the new instrument configuration.]
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Table 4-5. Command and Query Reference (cont)
FILE_OPEN
Data File Open
Opens a data file for measurement logging.
FILE_OPEN
<file>
<file> = DAT00.HYD, DAT01.HYD, DAT99.HYD
All scans are appended to this file until a file close is performed. The
special name ’*’ opens the next available file in sequence. If no higher
numbered file can be found, the algorithm "wraps" to zero and keeps
searching. If no more file names are available, an Execution Error is
generated. If the given file already exists, the file name does not match the
convention, or scanning is already active, an Execution Error is generated.
Logging is turned on and the card destination activated if this command is
successfully executed.
Example: FILE_OPEN DAT31.HYD [Open data file DAT31.HYD for data
logging.]
FILE_OPEN?
Data File Open Query.
Returns the name of the data file to be used for logging, or an Execution
Error if no file is open.
Example: FILE_OPEN? returns DAT05.HYD [The file DAT05.HYD
is open for data logging.]
FILE_REMOVE
File Remove
Remove the given file from the memory card.
FILE_REMOVE
<file>
<file> = DAT00.HYD, DAT01.HYD, ... DAT99.HYD
or-
<file> = SET00.HYD, SET01.HYD, ... SET99.HYD
Removing the currently open data file will cause any scan data stored in
internal memory waiting to be written to the file to be lost.
An Execution Error is generated if the file does not exist, the card is write-
protected, the file name is invalid, card is not installed or the card is not
formatted. The file name convention is not checked.
Example: FILE_REMOVE DAT00.HYD [Remove the DAT00.HYD file.]
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Table 4-5. Command and Query Reference (cont)
FILE_RX
File Receive
The normal serial protocol is suspended and a binary transfer (XMODEM)
is started between the instrument memory card and the host computer.
Received data is typically an instrument configuration file transmitted from
the host computer and uses the naming convention, SETxx.HYD. If the file
already exists it is overwritten.
FILE_RX
<file>
<file> = SET00.HYD, SET01.HYD, ... SET99.HYD
An Execution Error is generated under any of the following conditions: the
card is not installed; the card is not formatted; the file cannot be created;
scan or monitor is active; the instrument is configured for even or odd
parity (parity must be "none"); or the instrument is configured for Echo On
(Echo must be "Off"). See the FILE_TX command for transmitting data
files. The file name convention is not checked, so any file may be
transferred to the memory card.
FILE_SPACE?
FILE_STORE
File Space
Returns the number of kilobytes available for files on the memory card.
Example: FILE_SPACE? returns 1003 [There are 1003 kilobytes free on
the memory card.]
Configuration File Store
Saves present instrument configuration in the given file.
FILE_STORE
<file>
<file> = SET00.HYD, SET01.HYD, ... SET99.HYD
Configuration file names must match the naming convention ’SETxx.HYD’
where xx is a two-digit integer number. If the given file already exists, it is
overwritten. If there is not enough room to store a new configuration file, if
the card is write-protected, card is not installed, or card is not formatted,
an Execution Error is generated.
Example: FILE_STORE SET21.HYD [Save the present instrument
configuration in the file SET21.HYD.]
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4
Table 4-5. Command and Query Reference (cont)
FILE_TAG?
Configuration File Tag
Return the tag from the given configuration or data file (<file> specified), or
the present configuration tag (no <file> specified).
FILE_TAG?
<file>
<file>= DAT00.HYD, DAT01.HYD, ... DAT99.HYD
-or-
<file> = SET00.HYD, SET01.HYD, ... SET99.HYD
-or- leave blank
Instrument-created configurations use the configuration file name
SETxx.HYD for this tag. If no tag has ever been used since the last full
reset, or the specified file does not exist, an Execution Error is generated.
Example: FILE_TAG? SET17.HYD returns TESTFILE [Present
configuration tag in SET17.HYD is the string TESTFILE (set by the user).]
FILE_TX
File Transmit
The normal serial protocol is suspended and a binary transfer (XMODEM)
is started between the instrument memory card and the host computer.
The instrument will transmit a DATxx.HYD file or SETxx.HYD file to the
host computer.
FILE_TX
<file>
<file> = DAT00.HYD, DAT01.HYD, ... DAT99.HYD
-or-
<file> = SET00.HYD, SET01.HYD, ... SET99.HYD
An Execution Error is generated under any of the following conditions: the
card is not installed; the card is not formatted; the file does not exist; scan
or monitor is active; the instrument is configured for even or odd parity
(parity must be "none"); or the instrument is configured for Echo On (Echo
must be "Off"). See the FILE_RX command for receiving instrument
configuration files. The file name convention is not checked, so any file
may be transferred to the memory card.
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Table 4-5. Command and Query Reference (cont)
FORMAT
Response Format
Set the output format type to include or exclude measurement units.
FORMAT 1
FORMAT 2
Measurements returned without units.
Measurements returned with units.
Commands that return measurement data (like LAST?, NEXT?, MIN?,
MAX?) can be expressed as a number only (FORMAT 1) or as a number
with a measurement unit (FORMAT 2). If this command is entered during
scanning while logging to the memory card, an Execution Error is
generated. The measurement units are:
MEASUREMENT
Scaled
Volts DC
Volts AC
Resistance
Frequency
UNITS STRING
MX+B”
“VDC”
“VAC”
“OHMS”
“Hz”
Temperature °C
Temperature °F
“C”
“F”
With FORMAT 1 asserted, typical returns would be +890.22E+0,
+230.96E-3, 072.4E+0, +003.2E; with FORMAT 2 asserted, the returns
would be +890.22E+0 HZ,+230.96E-3 VAC, 072.4E+0 F, +003.2E+0
Mx+B.
FORMAT?
Query Response Format
Returns the output format type.
1
2
Measurements returned without units.
Measurements returned with units.
Commands that return measurement data (like LAST?, NEXT?, MIN?,
MAX?) can be expressed as a number only (FORMAT 1) or as a number
with a measurement unit (FORMAT 2). The measurement units are:
MEASUREMENT
Scaled
Volts DC
Volts AC
Resistance
Frequency
UNITS STRING
MX+B”
“VDC”
“VAC”
“OHMS”
“Hz”
Temperature °C
Temperature °F
“C”
“F”
Example: FORMAT? returns 2 [Measurement data will be returned with a
units indicator, e.g., +230.96E-3 VAC.]
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Table 4-5. Command and Query Reference (cont)
FUNC
Channel Function Definition
Define the Changing a channel configuration automatically erases values held in
review, and resets all ALARM OUTPUTS and DIGITAL I/O lines to logical high. The
FUNC command clears any alarm limits and scaling values for this channel;
therefore, define a channel function before setting alarm limits and/or scaling values
for that channel. measurement function and range for the indicated channel.
FUNC <channel>, <function>, <range>, <terminals>
<channel> = 0, 1,2, ...20
<function> = OFF, VDC, VAC, OHMS, FREQ, TEMP
<range> = 1,2,3,...6, AUTO [VDC, VAC,OHMS, FREQ]
<range> = J, K, E, T, N, R, S, B, C [TEMP with thermocouples]
<range> = PT [TEMP with RTDs]
<terminals> = 2 or 4
Ohms and temperature measurements that use a 4-terminal configuration are limited
to channels 1 to 10. Select a channel function, OFF, VDC, VAC, OHMS, FREQ, or
TEMP. For voltage, ohms or frequency, select a range 1 to 6, as specified in the
table below (or AUTO for autoranging) For temperature, select a thermocouple type,
or PT for RTDs.
RANGE
VOLTAGE
300 mV
3 V
OHMS
300 e
3 ke
FREQUENCY
900 HZ
9 kHz
1
2
3
4
5
6
30 V
30 ke
300 ke
3 Me
90 kHz
150/300 V*
90 mV**
900 mV**
900 kHz
1 Mhz
10 Me
*300V only on channels 0, 1, and 11
** Volts DC only
The <terminals> selection is specified only when the function type is OHMS, or
TEMP using an RTD. The 2-terminal selection is valid on any channel. The 4-
terminal selection is valid only for channels 1 to 10 (n), which automatically clears a
channel a decade higher (n+10).
Example: FUNC 9,TEMP, PT,2 [Set the function of channel 9 to temperature
measurements using a Platinum RTD, and the 2-terminal connection.] Example:
FUNC 5,VDC,4 [Set the function of channel 5 to volts DC, and use the 150V scale.]
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Table 4-5. Command and Query Reference (cont)
FUNC?
Channel Function Query
Return the complete function for the indicated channel.
FUNC?
<channel>
<channel> = (0 .. 20)
The returns are in comma-separated data fields using the following format:
<function>,<range>,<terminals>
The <function> return is OFF, VDC, VAC, OHMS, FREQ, or TEMP. For voltage,
ohms, or frequency the <range> return is a number 1 through 6 (see below) or
AUTO for autoranging. The <range> return for temperature is a thermocouple type
[J, K, E, T, N, R, S, B, C] or PT for RTD measurements. The <terminals> return is for
OHMS and TEMP functions only and is either 2 for 2-terminal measurements or 4 for
4-terminal measurements.
Example: FUNC? 8 returns TEMP, PT,4 [The function of channel 8 is temperature,
using a Platinum resistance-temperature-detector (RTD), and a 4-terminal
measurement configuration
*IDN?
IEE
Identification Query
(See front of table.)
Instrument Event Enable
Sets the Instrument Event Enable Register to the given value.
IEE
<value>
<value> = (0 .. 255)
The IEE register is used to enable or disable (mask) the output bits of the Instrument
Event Register (IER). The combined output of the IEE and IER is the Instrument
Event Bit (IEB), which is used as an input for the Status Byte Register. See the
discussion on status registers for more
information.
Example: IEE 5 [Enables the IER output byte 00000101 (decimal 5), which means
an Open Thermocouple -or- Alarm Limit Transition will set IEB logic high.]
IEE?
IEE?
Instrument Event Enable Query
Returns the present value of the Instrument Event Enable Register as an integer.
Instrument Event Register Query
Returns the present value of the Instrument Event Enable Register (IEE) as an
integer, as selected with the IEE command. See the discussion on status registers
for more information.
Example: IEE? returns 128 [The IEE register is set for 10000000 (decimal 128),
which means a Scan Complete will set IEB logic high.]
Instrument Event Register Query
IER?
Returns the value of the Instrument Event Register (IER) as an integer, then clears
the register to 0. See the discussion on status registers for more information.
Example: IER? returns 133 [The IER register is set for 10000101 (decimal 133),
which means a Scan Complete, Open Thermocouple, and Alarm Limit Transition
were detected.]
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Table 4-5. Command and Query Reference (cont)
INTVL
Set Scan Interval
Set scan interval time.
INTVL <hours>,<minutes>,<seconds>
<hours> = (0 .. 9)
<minutes> = (0 .. 99)
<seconds> = (0 .. 99)
An Execution Error is generated if values outside the specified ranges are used or if
the instrument is scanning.
Example: INTVL 1,30,0 [Set the interval time to 1 hour, 30 minutes and 0 seconds.]
Scan Interval Query
INTVL?
LAST?
Return scan interval time. Returns the scan interval time in the format
<hours>,<minutes>,<seconds>.
Example INTVL? returns 0,0,0 [The interval time is 0 hours, 0 minutes, and 0
seconds (continuous scanning).]
Channel’s Last Scan Value
Returns the last measured value(s) for the scan in progress or the last completed
scan.
LAST?
<channel>
<channel> = 0, 1, 2, ... 20
Returns last measurement values for either the indicated channel, or for all defined
channels if the <channel> field is left blank. An Execution Error results if a request is
made for a channel defined as OFF, the channel specified is invalid, the channel
specified has been set up but not yet measured, or Review array values have been
cleared by REVIEW_CLR, or by changing any parameter on any channel. The
returned value is a signed number with decimal point and exponent. For slow
scanning rate, 5 digits are returned (+/-XX.XXXE+/-N); for fast scanning rate, 4 digits
are returned (+/-XX.XXE+/-N). The channel range setting determines placement of
the decimal point. A return of +001.00E+9 indicates an overload (OL) condition; a
return of +009.00E+9 indicates an open thermocouple (otc) condition. If no channel
specification is made, all the last values of the scanned channels are returned, each
separated by a comma.
Example: LAST? 1 returns +0074.4E+0 [The last scanned value of channel 1 is
74.4.]
Example: LAST? returns +060.14E+0,+013.84E+0,+009.00E+9 [Three channels
were scanned. The first channel had a last reading of 60.14; the second channel had
a last reading of 13.84; the third channel reading indicates an open thermocouple
(RATE 0 and FORMAT 1 are asserted).]
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Table 4-5. Command and Query Reference (cont)
LOCK
Lock and unlock the instrument front panel control keys. The LOCK modes disable
the front panel keys, while placing the instrument in either REVIEW (LOCK 1),
MONITOR (LOCK 2) or Configuration Lock (LOCK 3). This limits instrument
operation to a specific mode and prevents unauthorized configuration changes. Only
supervisory personnel should be aware that the F and B keys can be used to
toggle the LOCK modes on and off, except for LOCK 3, which is reset from the
computer interface only or by loading a non-LOCK 3 setup file.
LOCK modes 1 and 2 are not saved/restored in configuration files. If one of these
modes is active when FILE_STORE is performed, mode 0 (unlocked) is stored in the
file.
LOCK
<mode>
<mode> = 0,1,2,3
LOCK 0
Unlock the front panel and turn off the REM (remote) annunciator.
All key functions are
enabled. This command is used to clear
a LOCK 1, LOCK 2, or LOCK 3 condition.
LOCK 1
LOCK 2
LOCK 3
Lock the front panel in the REVIEW mode and turn on the REM
(remote) annunciator.
keys are unlocked to allow the review of the
Only the up/down and left/right arrow
minimum,
maximum, and last values of any channel. The front panel can be
unlocked by using the LOCK 0 command, or by simultaneously
pressing the front panel F and B keys. The F and B
keys can be used toggle between the locked and
modes, while in REVIEW.
unlocked
Lock the front panel in the MONITOR mode (which must be active
or the command will generate an execution error) and turn on the
REM (remote) annunciator. Only the up/down arrow keys are
unlocked to allow the monitoring of any channel. The front panel
can be unlocked by using the LOCK 0 command, or by
simultaneously pressing the front panel F and B keys. The
F and b keys can be used to toggle between
the locked
and unlocked modes, while in MON.
Lock the channel configuration. The instrument operates normally
except keys used to configure a channel are disabled, that is , the
configuration is locked. A configuration file can be loaded; scan
can be turned on/off, monitor on/off, and review on/off. Exit this
mode using the power-up configuration-reset sequenced from the
instrument front panel
out disabled.
or load a configuration file that has lock-
The four LOCK states are nonvolatile. If power is interrupted, the instrument retains
the last LOCK setting.
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Table 4-5. Command and Query Reference (cont)
Returns the instrument front panel lock status, as selected with the LOCK command.
LOCK?
0
1
Front panel keys are unlocked. All key functions are enabled.
Front panel keys are locked, except for up/down and left/right arrow
keys, which are used to review the minimum, maximum and last
values of any channel
2
3
Front panel keys are unlocked, except for the up/down arrow keys,
which are used to monitor any channel.
Front panel keys can be used, except those used to configure a
channel.
LOCS
LOG?
Local without Lockout
All front panel keys are enabled, and the REM annunciator is not lit. This is the state
assumed by the instrument at power-up reset. To disable all the front panel keys,
use the LWLS command.
Retrieve Logged Data Query
Return the oldest logged scan values for all configured channels and remove them
from internal memory (maximum 100 scans). This query is valid during scanning.
The remaining count of stored scans (LOG_COUNT? command) is decremented by
1. Channels defined as OFF are not included. If there are no logged scans to
remove, an
Execution Error is generated.
The returns includes the following information:
•
•
•
Date and time at the start of the logged scan.
Values for the channels measured.
Status of ALARM OUTPUTS, DIGITAL I/O, and totalize count.
Logging scans in internal memory is enabled by the PRINT and PRINT_TYPE
commands.
Example: LOG? returns 16,15,30,7,21,94,+034.53E-3 VAC,+09.433E+0
VDC,+1.2043E+6 OHMS,15,255,+00.000E+3 [The oldest recorded scan, that
started at 1600 hours, 15 minutes, 30 seconds, on July 21, 1994, measured three
channels with readings 34.53mVAC, 9.433 VDC, 1.2043 M OHMS, with ALARM
OUTPUTS status 15, DIGITAL I/O status 255, and totalize count of 0 (RATE 0 and
FORMAT 2 are asserted).]
Retrieve specified scan data from internal memory.
LOGGED? <index>
LOGGED?
<index>
=
(1,2, 3, .. , 100)
A maximum of 100 scans can be recorded in the internal memory. This command is
used to retrieve a particular scan. If the <<index>> number has no associated scan,
an Execution Error is returned. Logging scans in internal memory is enabled by the
PRINT and PRINT_TYPE commands.
Scan data is returned in the same format as for the LOG? query.
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Table 4-5. Command and Query Reference (cont)
LOG_BIN?
Binary Upload of Logged Data
Returns a single ASCII string, which encodes the raw binary data stored at the
specified <index> position.
LOG_BIN?
<index>
<index> = 1, 2, 3, ... 100
See Appendix C for a discussion of the LOG_BIN? command.
LOG_CLR
Clear Logged Scans
Clear all stored scan data from internal memory (maximum 100 scans).
Clear Oldest Logged Scan
LOG_CLR_1
Clears the oldest (first) scan in the internal memory. If there are no scans in internal
memory, an Execution Error is generated. A total of 100 scans can be saved in the
log queue.
LOG_COUNT?
Logged Scan Count Query
Return the number of stored scans. Returns an integer value representing the
number of scans presently stored in memory. (maximum 100) 0 indicates that there
are no stored scans.
Logging scans in internal memory is enabled by the PRINT and PRINT_TYPE
commands.
Example: LOG_COUNT? returns 33 [The internal memory holds data from the last
33 scans.]
LOG_MODE
Action when Internal Memory is Full.
Determines what action is taken when 100 scans have been recorded
LOG_MODE 0
LOG_MODE 1
the oldest scans and record new scans.
Maintain the oldest scans and discard new
The LOG_MODE setting is nonvolatile and cannot be changed from the instrument
front panel. The default is LOG_MODE 0.
LOG_MODE?
Action when Internal Memory is Full Query
Returns 0 or 1 to indicate what action will be taken when 100 scans have been
recorded
0
1
Discarding the oldest scans to record new scans.
Maintaining the oldest scans and discarding new scans
LWLS
Local with Lockout
All front panel keys are disabled. The REM annunciator is not lit. This command can
be used when the instrument is scanning or monitoring. To clear, use the LOCS
command.
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Table 4-5. Command and Query Reference (cont)
MAX?
Channel’s Maximum Value
Returns the maximum value(s) measured since the review array was last cleared.
Channel’s Maximum Value
MAX?
<channel>
<channel> = 0, 1, 2, ...20, or leave blank
Returns maximum measurement values for either the indicated channel, or for all
defined channels if the <channel> field is left blank. An Execution Error results if a
request is made for a channel defined as OFF, the channel specified is invalid, the
channel specified has been set up but not yet measured, or Review array values
have been cleared by REVIEW_CLR, or by changing any parameter on any channel.
The return is a signed number with decimal point and exponent. For slow scanning
rate, 5 digits are returned (+/-XX.XXXE+/-N); for fast scanning rate, 4 digits are
returned (+/-XX.XXE+/-N). The channel range setting determines placement of the
decimal point. A return of +001.00E+9 indicates an overload (OL) condition; a return
of +009.00E+9 indicates an open thermocouple (otc) condition. If no channel
specification is made, all the maximum values of the scanned channels are returned,
each separated by a comma.
Example: MAX? 1 returns +022.34E+0 [The maximum scanned value of channel 1 is
22.34.]
Example: MAX? returns +009.00E+9,+890.22E+0,+230.96E-3 [Three channels were
scanned. The first channel shows an open thermocouple; the second channel had a
maximum reading of 890.22; the third channel had a maximum reading of 0.230
(RATE 0 and FORMAT 1 are asserted).]
Memory Card Status
MCARD?
Returns the memory card status as an encoded integer number from a binary
number using bits 0 to 4.
Bit 0 - Card changed; remaining bits differ from the last query
Bit 1 - A card is present in the unit
Bit 2 - Card is write protected
Bit 3, 4 - Battery status of last inserted card, as below:
BIT 4
BIT 3
MEMORY CARD BATTERY STATUS
Battery operational
Battery should be replaced; data is OK
Battery and data integrity not guaranteed
Battery and data integrity not guaranteed
0
0
1
1
0
1
0
1
Example: MCARD? returns 7 [The memory card status is 00111 (decimal 7),
meaning the card changed since the last query, a card is in the unit, the card is write
protected, and battery is operational.]
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Table 4-5. Command and Query Reference (cont)
MCARD_DIR?
Memory Card Directory
Returns a terminated string for each file in the root directory of the memory card. The
string is a comma-separated list of the file’s name, size, modification date (day,
month, year) and time (hours, minutes, seconds).
Example: MCARD_DIR? returns:
DAT00.HYD,826,7,21,1994,16,20,44
DAT01.HYD,810,7,21,1994,16,50,10
SET00.HYD,730,7,21,1994,17,10,32
SET01.HYD,730,7,21,1994,18,30,03
MCARD_FORMAT Format Memory Card
Memory card inserted in the Data Bucket will be formatted. The card must be the
static RAM (SRAM) type, meeting PCMCIA standards. An Execution Error is
generated and the card not formatted if scanning is in progress, the card is of
unknown size, or card is write-protected. If the memory card contains a PCMCIA
card information structure (CIS), the card size is determined from the CIS.
Otherwise, the size is algorithmically determined by writing to the memory card. A
CIS is never written to the card.
When formatting a memory card, any scan data that has been stored in internal
memory waiting to be written to a valid memory card will be lost.
MCARD_SIZE?
Memory Card Size
Returns the memory card size as an integer number of kilobytes.
Example: MCARD_SIZE? returns 1024 [Memory card size is 1024 kilobytes (1
megabyte).]
MIN?
Channel’s Minimum Value
Returns the minimum value(s) measured since the review array was last cleared.
MIN?
<channel>>
<channel> = 0, 1, 2, ... 20, or leave blank
Returns minimum measurement values for either the indicated channel, or for all
defined channels if the <channel>field is left blank. An Execution Error results if a
request is made for a channel defined as OFF, the channel specified is invalid, the
channel specified has been set up but not yet measured, or Review array values
have been cleared by REVIEW_CLR, or by changing any parameter on any channel.
The return is a signed number with decimal point and exponent. For slow scanning
rate, 5 digits are returned (+/-XX.XXXE+/-N); for fast scanning rate, 4 digits are
returned (+/-XX.XXE+/-N). The channel range setting determines placement of the
decimal point. A return of +001.00E+9 indicates an overload (OL) condition; a return
of +009.00E+9 indicates an open thermocouple (otc) condition. If no channel
specification is made, all the minimum values of the scanned channels are returned,
each separated by a comma.
Example: MIN? 16 returns +167.85E+3 [The minimum scanned value of channel 16
is 167,850 (RATE 0 and FORMAT 1 are asserted).]
Example: MIN? returns +091.67E+0,+001.00E+9,+115.21E-3 [Three channels were
scanned. The first channel had a minimum reading of 91.67; the second channel is
in overload (OL); the third channel had a minimum reading of 0.11521 (RATE 0 and
FORMAT 1 are asserted).]
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Table 4-5. Command and Query Reference (cont)
MON
Enable/Disable Monitoring
This command performs the same function as on the front panel.
MON
1
<channel>
<channel> = 0, 1, 2 ... 20
Disables monitoring
MON
0
The <channel> parameter can be 0 through 20. A command error is generated if no
<channel> parameter is given when enabling monitoring. If the channel to be
monitored is invalid or defined as OFF, or if values other than 0 or 1 are given, an
Execution Error is generated.
The MON and SCAN commands work in conjunction with the front panel controls.
The Monitor and Scan functions can be enabled or disabled from either the front
panel or the computer interface. The most recently specified monitor channel (from
front panel or computer interface) becomes the one channel monitored.
Example: MON 1,6 [Turn on monitor and monitor channel 6.]
Example: MON 0 [Turn monitor off.
MON_CHAN?
Monitor Channel Number
This query asks for the number of the presently defined monitor channel. If
monitoring is not active, an Execution Error is generated.
Example: MON_CHAN? returns 9 [Channel 9 is being monitored.]
Example: MON_CHAN? returns nothing and generates an
Execution Error [No channel is being monitored.]
Monitor Channel Value
MON_VAL?
This query asks for a measurement on the monitor channel. If monitoring is not
active, an Execution Error results. A return of +001.00E+9 indicates an overload
(OL) condition; a return of +009.00E+9 indicates an open thermocouple (otc)
condition.
Example: MON_VAL? returns +115.67E+0 VAC [The channel being monitored was
measured to have a value of 115.67 VAC (RATE 0 and FORMAT 2 are asserted).]
Example: MON_VAL? returns nothing and generates an Execution Error [No
channel is being monitored.]
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Table 4-5. Command and Query Reference (cont)
NEXT?
Next Scan’s Values
The NEXT? query returns data values for the next scan to complete. If a scan is in
progress when the NEXT? query is processed, the data values returned are from the
scan in progress. If a scan is not presently in progress, the NEXT? query waits for
data to become available. While waiting, no other commands can be issued. To exit
NEXT? while waiting, use <CNTL><C>.
NEXT? returns comma-separated information for the date and time at the start of the
next measurement scan, the values for channels measured, the state of the Digital
I/O lines, and the totalizer count.
The time and date are returned in the following order: Hours (0-23), Minutes (0-59),
Seconds (0-59), Month (1-12), Date (1-31), Year (0-99). Measurement data is
returned as a list of scientific notation values. For an overload (OL), "+001.00E+9" is
returned. If an open thermocouple is detected, "009.00E+9" is returned.
ALARM OUTPUTS and DIGITAL I/O values are returned as integer values. (To
decode the ALARM OUTPUTS integer, see the ALARM_DO_LEVELS? command;
to decode the DIGITAL I/O integer, see the DIO_LEVELS? command. ) The
Totalizer value is returned as a scientific notation value.
Example: NEXT? returns 16,11,47,7,21,94,+1.0099E+3, +04.556E+0,-
13.665E+0,+1.2664E+6,+009.00E+9,15,255, +00.455E+3 [At 1600 hours, 11
minutes, 47 seconds, on July 21, 1994, five channels were scanned with the
measurements 1009.9, 4.556, -13.665, 1,266,400, open thermocouple,
Alarms I/O status was 15, DIGITAL I/O status was 255, and totalizer count was 455
(RATE 0 and FORMAT 1 are asserted).]
Example: NEXT? returns nothing and the computer interface does not accept
commands [The NEXT? command was entered when the instrument was not
scanning. Press the front panel Q key, or enter <CNTL><C> to clear the NEXT?
command.]
*OPC
Operation Complete
(See front of table.)
*OPC?
PRINT
Operation Complete Query
(See front of table.)
Data Logging Enable/Disable
The destination and conditions for data logging are determined by the PRINT_TYPE
command, while this command enables or disables the logging of the measurement
data.
PRINT 0 Disable data logging to memory card and printer
PRINT 1 Enable data logging to memory card and printer
The PRINT command does not affect the logging of data (100 scans maximum) to
the internal memory (log queue), which is always active when selected as a
destination (PRINT_TYPE 1,2,5, or 6). If scanning is already active, an Execution
Error is generated.
When PRINT 1 is asserted, the instrument front panel PRN (Logging) annunciator is
on. When PRINT 0 is asserted, the instrument front panel PRN annunciator is off.
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Table 4-5. Command and Query Reference (cont)
PRINT?
Data Logging Query
Returns the status of data logging, as selected with the PRINT command.
0
1
PRINT 0 is selected (data logging disabled)
PRINT 1 is selected (data logging enabled
PRINT_TYPE
Set Data Logging Type
Set the destination and condition for data logging. When data logging is enabled
with the PRINT command, the destination and conditions are set with the
PRINT_TYPE command. The <destination< is selected with an integer (0 to 6), and
the <type< is selected with an integer (0 to 2). Internal memory is limited to 100
scans. To extract the data from the internal memory, see the LOG? and LOGGED?
commands. Attempting to use this command to select a memory card as the logging
destination while scanning will cause an Execution Error.
PRINT_TYPE
<destination>, <type>
<destination> = 0, 1, 2, ... 6
0 = Log data to printer
1 = Log data to log queue
2 = Log data to log queue and printer
3 = Log data to memory card
4 = Log data to memory card and printer
5 = Log data to memory card and log queue
6 = Log data to memory card, log queue, and printer
<type< = 0, 1 or 2
0 = Record all scans
1 = Record scans if any scanned channel is in alarm
2 = Record scans when any alarm transitions
When the log queue is selected as the destination, all scans area automatically
recorded in the log queue as if type 0 was selected. types 1 and 2 are ignored for
the log queue, but are still executed for other destinations selected (i.e., the printer
and memory card.
The PRINT command does not affect the logging of data (100 scans maximum) to
the internal memory (log queue), which is always active when selected as a
destination (PRINT_TYPE 1,2,5 or 6).
Example: PRINT_TYPE 3,1 [When data logging is enabled (see PRINT command),
send data to the memory card but only if one of the scanned channels is in alarm.]
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Table 4-5. Command and Query Reference (cont)
PRINT_TYPE?
Data Logging Type Query
Returns the status of data logging destination and condition, as selected with the
PRINT_TYPE command. Returns two integers in the form <destination<,<type> as
follows:
<destination> = 0, 1, 2, ... 6
0 = Log data to printer
1 = Log data to internal memory
2 = Log data to internal memory and printer
3 = Log data to memory card
4 = Log data to memory card and printer
5 = Log data to memory card and internal memory
6 = Log data to memory card, internal memory, and printer
<type< = 0, 1 or 2
0 = Record all scans
1 = Record scans if any scanned channel is in alarm
2 = Record scans when any alarm transitions
Example: PRINT_TYPE? returns 5,0 [Destination for logged data is to the memory
card and internal memory, and all scans are recorded.]
RANGE?
Channel Range Query
Returns the range(s) used for the scan in progress or the last completed scan. If a
channel is configured for autoranging, the actual range used for the measurement is
returned.
RANGE?
<channel>
<channel> = 0, 1, 2, ... 20, or leave blank
If the <channel> specification field is left blank, values for all defined channels are
returned. An Execution Error results if a request is made for a channel defined as
OFF, the channel specified is invalid, or if the channel has been set up but not
measured with at least one scan. The range value returned is not affected by Mx+B
scaling.
An integer value (1-6) is returned, based on the table below. Temperature functions
(thermocouple and RTD) always return a 1. Commas separate the integers if the
return is for all scanned channels.
RANGE
VOLTAGE
OHMS
FREQUENCY
1
2
3
4
5
6
300 mV
3 V
30 V
150/300 V*
90 mV**
900 mV**
300e
3 ke
30 ke
300 ke
3 Me
10 Me
900 Hz
9 kHz
90 kHz
900 kHz
1 Mhz
*300 V only on channels 0 and 11.
**Volts DC only.
Example: RANGE? 12 returns 3 [Channel 12 has a range of 3. If measuring voltage,
it would indicate the 30V scale.].
Example: RANGE? returns 2,2,1,6 [Four channels were scanned. The first and
second have a range of 2, the third a range of 1, and the fourth a range of 6.]
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Table 4-5. Command and Query Reference (cont)
RATE
Select Measurement Rate
Specifies the measurement rate. Changing the measurement rate also clears the
Review array, and ALARM OUTPUTS and DIGITAL I/O lines.
RATE 0
RATE 1
Selects the slow measurement rate.
Selects the fast measurement rate.
Selection of the fast measurement rate using the RATE 1 command will speed up
the measurement portion of the scan interval; however, the measurement resolution
is four digits instead of five digits. For example, a reading of +115.32 with a slow
measurement rate would be +115.3 with the fast measurement rate. An Execution
Error is generated if the argument is not 0 or 1 or if the instrument is scanning.
RATE?
REMS
Measurement Rate Query
Return measurement rate for the instrument.
0 Measurement rate is slow
1
Measurement rate is fast
Remote without Lockout
Places the instrument in the remote mode, lights the front panel REM annunciator,
and only two front panel keys are active (with special REMS functionality):
The Q key triggers a single scan.
The K key returns the instrument to normal front panel control.
To return the instrument to normal front panel control with a command, use the
LOCS command.
REVIEW_CLR
Clear Review Values
Clear all minimum, maximum, and last values (all channels) in the Review array. (It
is not possible to selectively clear individual entries in the Review array.) The Review
clearing operation is carried out at any time, except during the measurement portion
of the scan internal. only at the completion of any scan in progress. Clearing the
Review array also clears ALARM OUTPUTS and DIGITAL I/O lines to a logic high..
Reset
*RST
(See front of table.)
RTD Ice Point (R0)
RTD_R0
For the indicated channel, store the numeric data as the RTD R0 ice point
resistance, i.e., the resistance of the RTD at 32°F (0°C). Changing the ice point also
clears the Review array and ALARM OUTPUTS and DIGITAL I/O lines. (The 0
portion of R0 in the RTD_R0 command is the number zero.) The default value is
100.00.
RTD_R0
<channel<, <R0>
<channel> = 0,1,2 ... 20
<R0> = 000.00 to 999.99
An Execution Error is generated if the R0 value supplied is not within the indicated
range, the channel specified is invalid, the channel is defined as OFF, or
measurements are active.
Example: RTD_R0 6, 124.85 [For channel 6, set the R0 ice point resistance to a
value of 124.85.]
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Table 4-5. Command and Query Reference (cont)
RTD_R0?
RTD Ice-Point (R0) Query
Returns the RTD R0 (ice-point resistance) value for the indicated channel. (The 0
portion of R0 in the RTD_R0 command is the number zero.)
RTD_R0?
<channel>
<channel< = 0,1,2, ... 20
If the channel number is invalid, an Execution Error is generated. If a channel is
defined OFF, or if no change has been made to R0 for a channel, the value
"+100.00E+0" (default) is returned.
RWLS
Remote with Lockout (RS-232 only)
Enter the IEEE-488.1 remote with front panel lockout (RWLS) state. All front panel
buttons are disabled, and the REM annunciator is lit.
If this command is used with the IEEE-488 interface, an Execution Error is
generated.
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Table 4-5. Command and Query Reference (cont)
SCALE_MB
Set Mx+B Scaling Values
Set the M and B scaling values for the indicated channel, and display the results of
the Mx+B calculation in the indicated display range. Changing the Mx+B of any
channel also clears the Review array, and resets ALARM OUTPUTS and DIGITAL
I/O lines.
SCALE_MB
<channel>,<M_value>,<B_value>,<range>
<channel> = (0 .. 20)
<M_value> = signed numeric quantity
<B_value> = signed numeric quantity
<range> = (1 .. 16)
The range code for the display <range> is shown below
Range
Code
Display
Offset
Value
Max B
1
2
3
4
5
6
7
8
0.0000 m
00.000 m
000.00 m
0000.0 m
0.0000 x1
00.000 x1
000.00 x1
0000.0 x1
0.0000k
9.9999E-3
99.999E-3
999.99E-3
9999.9E-3
9.9999
99.99
999.99
9999.9
9.9999E3
99.999E3
999.99E3
9999.9E3
9.9999E6
99.999E6
999.99E6
9999.9E6
9
10
11
12
13
14
15
16
00.000k
000.00 k
0000.0 k
0.0000 M
00.000 M
000.00 M
0000.0 M
When M=1 and B=0, there is no Mx+B scaling. The entries for M and B must be
between +/-0.0001E-3 and +/-9999.9E+6. An Execution Error is generated by invalid
entries, a channel set to OFF, if the instrument is
scanning, or if the range code is too low for the selected B value. For example, the
minimum display range for B=1000 is code 8. Mx+B scaling values for a channel are
automatically reset to 1 (M) and 0 (B) when the function for that channel is changed.
Returned measurements for a channel with Mx+B scaling has a function identifier of
MX+B (when FORMAT 2 has been asserted).
Example: SCALE_MB 18,+.55555,-17.777,6 [For channel 18, M=+.55555, B=-
17.777, and the display range is 00.000 x1.]
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Table 4-5. Command and Query Reference (cont)
SCALE_MB?
Mx+B Scaling Values Query
Return the M and B scaling values for the indicated channel.
SCALE_MB?
<channel>
<channel> = 0, ... 20
This command returns three values. The first two are the M and B values for the
channel indicated, even when M=1 and B=0 or the channel function is defined as
OFF. These first two values are returned in M and B order and in scientific notation
format with five digits of resolution. The third value returned indicates the Mx+B
display range. The Mx+B scaling values are automatically reset to 1 (M) and 0 (B)
when the function for that channel is changed.
The range code for the display <range> is shown below:
Range
Code
Display
Offset
Value
Max B
1
2
3
4
5
6
7
8
0.0000 m
00.000 m
000.00 m
0000.0 m
0.0000 x1
00.000 x1
000.00 x1
0000.0 x1
0.0000k
9.9999E-3
99.999E-3
999.99E-3
9999.9E-3
9.9999
99.99
999.99
9999.9
9.9999E3
99.999E3
999.99E3
9999.9E3
9.9999E6
99.999E6
999.99E6
9999.9E6
9
10
11
12
13
14
15
16
00.000k
000.00 k
0000.0 k
0.0000 M
00.000 M
000.00 M
0000.0 M
Example: SCALE_MB? 0 returns +1.0000E+0,-1.0000E+3,9 [For channel 0, M=1,
B=-1000, and the display range is 0.0000 k.]
Enable/Disable Scanning
SCAN
This command performs the same function as Q on the front panel.
SCAN 1
SCAN 0
Enable scanning.
Disable scanning
If SCAN 0 is set during the measurement interval of the scan, the measurement
portion is completed. If SCAN 0 is set during the countdown interval of the scan, the
scan is immediately terminated.
If there are no configured channels (all are defined as OFF) or values other than 0 or
1 are given, an Execution Error is generated.
The MON and SCAN commands work in conjunction with the front panel controls.
The Monitor and Scan functions can be enabled or disabled from either the front
panel or the computer interface. The most recently specified monitor channel (from
front panel or computer interface) becomes the one channel monitored.
Front panel Q and M buttons work only when the lockout state is “local without
lockout” (see the LOCS command)..
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Table 4-5. Command and Query Reference (cont)
SCAN?
Scan Query
Returns the scanning status, as selected with the SCAN command.
0
1
Scanning is disabled
Scanning is enabled
If a scan is in progress, a "1" is returned at the end of the scan. (A response delay
may occur if SCAN? is sent early in a scan.) This feature allows synchronization for
other commands that would not be recognized if received during a scan. For
example, SCAN?;*TRG could be used to trigger a new scan after completion of the
current scan, where just a *TRG command sent while a scan is in progress would be
discarded. If a scan is not in progress, a "0" is returned immediately.
SCAN_TIME?
Time of Scan
Returns values indicating the time and date at start of last scan.
Uses the same format and order as the TIME_DATE? query. The data is returned in
the following order: Hours (0-23), Minutes (0-59), Seconds (0-59), Month (1-12),
Date (1-31), Year (0-99).
Example: SCAN_TIME? returns 7,56,50,7,21,94 [The start of the last scan was at
0700 hours, 56 minutes, 50 seconds, on July 21, 1994.]
*SRE
Service Request Enable
(See front of table.)
*SRE?
Service Request Enable Query
(See front of table.)
*STB?
Read Status Byte Query
(See front of table.)
Temperature Configuration
TEMP_CONFIG
Set temperature configuration using the given value. Changing the temperature
configuration also clears the Review array, and ALARM OUTPUTS and DITGITAL
I/O lines.
TEMP_CONFIG
<value>
<value> = 0. 1, 2 , 3
Selects the temperature scale (°C or °F) and enables or disables thermocouple
detection. When thermocouple detection is enabled and an open thermocouple is
detected, the monitor display will show "otc" and the measurement return is
+009.00E+9. When thermocouple detection is disabled and an open thermocouple is
detected, the monitor display will show "OL" and the measurement return is -
001.00E+9. These settings affect every channel; they cannot be set for each
channel individually. The command is entered when the instrument is not scanning.
Select the desired <value> from the table below.
Value
Meaning
0
1
2
3
OTC Disable and °C
OTC Disable and °F
OTC Enable and °C
OTC Enable and °F
Example: TEMP_CONFIG 3 [Measure temperature in °F and enable "otc" detection.]
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Table 4-5. Command and Query Reference (cont)
TEMP_CONFIG?
Temperature Configuration Query
Returns the status of the temperature configuration, as selected with the
TEMP_CONFIG command. Returns an integer 0, 1, 2, or 3, which corresponds to
the temperature configuration, as shown in the table below.
Value
Meaning
0
1
2
3
OTC Disable and °C
OTC Disable and °F
OTC Enable and °C
OTC Enable and °F
Example: TEMP_CONFIG? returns 2 [“otc” detection is enabled and the temperature
scale is °C.]
TIME
Set the instrument time.
TIME
<hours>,<minutes>
<hours> = (0 .. 23) (24-hour scale, 18:00 = 6:00 pm).
<minutes> = (0 .. 59)
[seconds] = (0, ... 59)
Invalid values generate an Execution Error. The [seconds] field can be left blank,
automatically entering 00.
Example: TIME 16,30,15 [Set the clock for 1600 hours (4 pm), 30 minutes, and 15
seconds.]
TIME_DATE?
Retrieve Time and Date
Returns comma-separated integer values for time, date, and year using the following
format:
hours
minutes
seconds
month
day
0-23
0-59
0-59
1-12
1-31
00-99
year
The TIME command is used to set hours, minutes, and seconds.
Example: TIME_DATE? returns 2, 43, 12, 7, 21, 94 [The time is 0200 hours, 43
minutes, 12 seconds, on July 21, 1994
TOTAL
Set Totalizer Count
Give the Totalizer count a new initial value.
TOTAL
<t_value>
<t_value> = (0 .. 65535)
If the value is not in the range 0 through 65,535, an Execution Error is generated.
Setting the totalizer count also clears the Totalize Overflow bit in the Instrument
Event Register (see Figure 4-3). Clear the Totalizer count by setting the Totalizer to
zero (0).
Example: TOTAL 12000 [Set the totalizer count to 12000 Clear the Totalizer count
by setting the Totalizer to zero (0).
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4
Table 4-5. Command and Query Reference (cont)
TOTAL?
Totalizer Value Query
Returns the value of the present Totalizer count. Format of the value is +00.000E+3.
When the Totalizer has overflowed, the value returned is +001.00E+9.
Example: TOTAL? returns 13.465E+3 [The present value of the totalizer count is
13,465.]
TOTAL_DBNC
Set Totalizing Debounce
Set totalizing input debounce state, which adds a delay of 1.75 ms to each transition,
allowing increased accuracy from totalizer inputs from contact closures.
TOTAL_DBNC
<dbnc_state>
<dbnc_state> = 1 (on)
0
(off)
Use of any other value causes an Execution Error to be generated. At initial power
up, totalize debounce is disabled (0). An Execution Error is generated if the totalizer
debouhce setting is changed when scanning while logging to the memory card is
enabled.
TOTAL_DBNC?
Totalizer Debounce Query
Returns the totalizing input’s debounce state, as selected with the TOTAL_DBNC
command.
0 Debounce is off
1 Debounce is on
SIngle-Scan Trigger
*TRG
(See front of table.)
Select Trigger Type
TRIGGER
Select the type of scan triggering option. The use of a trigger option has the same
effect as pressing the front panel Q key. An input for an external trigger is
available at the ALARM OUTPUTS connector on the rear panel of the instrument,
pins TR and GROUND (TRIGGER 1). Scanning can also be enabled when a
monitored channel goes into alarm (TRIGGER 2).
TRIGGER 0
TRIGGER 1
TRIGGER 2
External trigger and Alarm trigger disabled
External trigger enabled
Alarm trigger enabled
TRIGGER 0 means external triggering is disabled and only normal scan interval
triggering can be used. If this command is entered during scanning while logging to
the memory card, an Execution Error is generated.
TRIGGER 1 means that external triggering is enabled. An acceptable low input (-0.6
to +0.8V dc) between the pins TR and GROUND on the ALARM OUTPUTS
connector on the rear panel will cause the instrument to start scanning. When the
TR input returns to logic high, scanning is disabled. External trigger inputs during a
scan are ignored.
TRIGGER 2 means the alarm trigger is enabled. When a channel being monitored
goes into alarm, the instrument starts scanning. When the channel being monitored
goes out of alarm, the instrument stops scanning. The *TRG and GET commands
can be used with a trigger option selection.
If the trigger type given is not one of the listed values, an Execution Error is
generated.
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Users Manual
Table 4-5. Command and Query Reference (cont)
TRIGGER?
Trigger Type Query
Returns an integer representing the present trigger type:
0
1
2
External trigger and Alarm trigger disabled
External trigger enabled
Alarm trigger enabled
*TST?
*WAI
Self Test Query
(See front of table.)
Wait-to-continue
(see front of table)
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4
10 ' HYDRALOG.BAS Hydra Program to scan VDC, VAC, OHMS, FREQ or TEMP
20 '
30 '
40 '
50 '
60 '
70 '
- initializes RS-232 Communications between PC and Hydra
- configures a number of Hydra channels for one type
of measurement (e.g., VDC, VAC, temperature, etc.)
- scan channels 3 times, and display and record measurement
data in file "TESTDATA.PRN"
80 ' NOTE: Hydra must be set up for RS-232 communications, 9600 baud,
90 '
no parity, 8 bit data
100 '
110 KEY OFF
120 '
' Switch keyboard event trapping off
130 ' NOTE: Error message checking is not done here -- QBasic will notify the
140 ' user and exit if there is a problem
150 '
160 ' Open Communications port with 9600 baud, no parity, 8 it data,
170 '
180 '
ignore Clear to Send, Data Set Ready, and Carrier Detect.
190 OPEN "COM2:9600,N,8,,cs0,ds0,cd0" FOR RANDOM AS #1
200 '
210 '
220 OPEN "testdata.PRN" FOR OUTPUT AS #2
230 '
240 PRINT #1, "ECHO 0"
250 '
' Open data file
' Turn off command echo on Hydra
260 '-----
270 ' Find out the number of channels the user wants to configure
280 ' NOTE: Channel 0 will not be used
290 '
300 NUMCHANNELS = 0
310 WHILE (NUMCHANNELS < 1) OR (NUMCHANNELS > 20)
320
INPUT "Enter the number of channels to be scanned (1-20): ", NUMCHANNELS
330 WEND
340 '
350 'Turn unused channels off
360 PRINT "(Wait...)"
370 '
380 FOR INDEX = (NUMCHANNELS + 1) TO 20
390
400
PRINT #1, "FUNC " + STR$(INDEX) + ",OFF"
GOSUB 1120
410 NEXT INDEX
420 '
430 '
440 'Configure Hydra Channels
450 ' First, initialize screen and display Hydra identification info
460 CLS
470 LOCATE 1, 25: PRINT "Sample Program for Hydra"
480 PRINT #1, "*IDN?": GOSUB 1120: LINE INPUT #1, RESULT$
490 LOCATE 2, 20: PRINT RESULT$
500 '
510 WHILE (1)
520
530
540
550
560
570
580
590
600
610
'Print banner line at bottom of screen
LOCATE 25, 1
PRINT "1 = VDC
2 = VAC
3 = OHMS
4 = FREQ
5 = TEMP
6 = Quit";
' Get channel configurations
FUNC$ = "0"
WHILE (FUNC$ < "1") OR (FUNC$ > "6")
LOCATE 23, 1: INPUT "
WEND
Selection: ", FUNC$
' Exit and clean up if choice is "Quit"
IF FUNC$ = "6" THEN CLOSE 1, 2: CLS : KEY ON: END
op51f.eps
Figure 4-4. Sample Program (GWBASIC) (1 of 2)
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Users Manual
620 '
630
640
' Set up the common channel configuration string (function and range)
IF (FUNC$ = "1") THEN CONFIG$ = "VDC, 1"
650
IF (FUNC$ = "2") THEN CONFIG$ = "VAC, 1"
660
670
IF (FUNC$ = "3") THEN CONFIG$ = "OHMS, 1, 2" ' Assuming 2-terminal channel
IF (FUNC$ = "4") THEN CONFIG$ = "FREQ, 1"
680
IF (FUNC$ = "1") THEN CONFIG$ = "TEMP, K"
' Assuming K thermocouple
690 '
700
710
'Set up Hydra / Configure channels
LOCATE 23, 1: PRINT "Programming Hydra...";
FOR INDEX = 1 TO NUMCHANNELS
720
730
740
PRINT #1, "FUNC " + STR$(INDEX) + "," + CONFIG$
GOSUB 1120
750
NEXT INDEX
760 '
770
LOCATE 23, 1: PRINT "Measuring " + CONFIG$ + "
"
780 '
790
800
' Scan three times
FOR INDEX = 1 TO 3
810
820
PRINT #1, "*TRG"
GOSUB 1120
' Start a single scan
' Get prompt back from Hydra
830
PRINT #1, "SCAN_TIME?": GOSUB 1120
840
850
LINE INPUT #1, RESULT$
PRINT #2, RESULT$
' Get scan time stamp
' Save time stamp to data file
860
FOR CHANNELINDEX = 1 TO NUMCHANNELS
' Get scan data
870
880
PRINT #1, "LAST? " + STR$(CHANNELINDEX) ' Request channel data
GOSUB 1120
890
INPUT #1, RESULT$
' Get channel result
900
LOCATE CHANNELINDEX + 2, 25
910
PRINT "Chan " + STR$(CHANNELINDEX) + ": ";
920
930
940
950
PRINT RESULT$
PRINT #2, RESULT$ + ",";
NEXT CHANNELINDEX
PRINT #2, ""
' Print results to screen
' Print results to data file
' End of line to data file
960
NEXT INDEX
970 WEND
980 END
990 '
1000
1010
1020
1030
1040
1050
1060
1070
1080
1090
1100
1110
1120
1130
1140
1150
1160
1170
1180
1190
1200
1210
'
'
'
' CHECKRESPONSE Subroutine
' This subroutine checks the Hydra prompt after sending a command to
' Hydra, to see if an error occurred
'
' The possible responses are:
'
'
'
'
"=>(CR)(LF)"
"?>(CR)(LF)"
"!>(CR)(LF)"
(command successful)
(command syntax error)
(command execution error)
PROMPT$ = INPUT$(4, #1)
' Get prompt
'Command successful
IF INSTR(1, PROMPT$, "=>") <> 0 THEN RETURN
IF INSTR(1, PROMPT$, "?>") <> 0 THEN
PRINT "Command Syntax Error!"
ELSEIF INSTR(1, PROMPT$, "!>") <> 0 THEN
PRINT "Command Execution Error!"
END IF
'
PRINT "Program execution halted due to communications errors"
END
op51_1f.eps
Figure 4-5. Sample Program (GWBASIC) (2 of 2)
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4
' HYDRALOG.BAS Hydra Program to scan VDC, VAC, OHMS, FREQ or TEMP
'
'
'
'
'
- initializes RS-232 Communications between PC and Hydra
- configures a number of Hydra channels for one type
of measurement (e.g., VDC, VAC, temperature, etc.)
- scan channels 3 times, and display and record measurement
data in file "TESTDATA.PRN"
' NOTE: Hydra must be set up for RS-232 communications, 9600 baud,
'
no parity, 8 bit data
KEY OFF
' Switch keyboard event trapping off
' NOTE: Error message checking is not done here -- QBasic will notify the
' user and exit if there is a problem
' Open Communications port with 9600 baud, no parity, 8 it data,
'
ignore Clear to Send, Data Set Ready, and Carrier Detect.
OPEN "COM2:9600,N,8,,cs0,ds0,cd0" FOR RANDOM AS #1
OPEN "testdata.PRN" FOR OUTPUT AS #2
PRINT #1, "ECHO 0"
' Open data file
' Turn off command echo on Hydra
'-----
' Find out the number of channels the user wants to configure
' NOTE: Channel 0 will not be used
NumChannels = 0
WHILE (NumChannels < 1) OR (NumChannels > 20)
INPUT "Enter the number of channels to be scanned (1-20): ", NumChannels
WEND
'Turn unused channels off
PRINT "(Wait...)"
FOR Index = (NumChannels + 1) TO 20
PRINT #1, "FUNC " + STR$(Index) + ",OFF"
GOSUB CheckResponse
NEXT Index
op52_1f.eps
Figure 4-5. Sample Program (QBASIC) (1 of 3)
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'Configure Hydra Channels
' First, initialize screen and display Hydra identification info
CLS
LOCATE 1, 25: PRINT "Sample Program for Hydra"
PRINT #1, "*IDN?": GOSUB CheckResponse: LINE INPUT #1, Result$
LOCATE 2, 20: PRINT Result$
WHILE (1)
'Print banner line at bottom of screen
LOCATE 25, 1
PRINT "1 = VDC 2 = VAC 3 = OHMS 4 = FREQ 5 = TEMP 6 = Quit";
' Get channel configurations
Func$ = "0"
WHILE (Func$ < "1") OR (Func$ > "6")
LOCATE 23, 1: INPUT "
WEND
' Exit and clean up if choice is "Quit"
Selection: ", Func$
IF Func$ = "6" THEN CLOSE 1, 2: CLS : KEY ON: END
' Set up the common channel configuration string (function and range)
SELECT CASE Func$
CASE "1"
Config$ = "VDC, 1"
CASE "2"
Config$ = "VAC, 1"
CASE "3"
Config$ = "OHMS, 1, 2" ' Assuming 2-terminal channel
CASE "4"
Config$ = "FREQ, 1"
CASE "5"
Config$ = "TEMP, K"
END SELECT
' Assuming K thermocouple
'Set up Hydra / Configure channels
LOCATE 23, 1: PRINT "Programming Hydra...";
FOR Index = 1 TO NumChannels
PRINT #1, "FUNC " + STR$(Index) + "," + Config$
GOSUB CheckResponse
NEXT Index
LOCATE 23, 1: PRINT "Measuring " + Config$ + "
"
' Scan three times
FOR Index = 1 TO 3
PRINT #1, "*TRG"
GOSUB CheckResponse
' Start a single scan
' Get prompt back from Hydra
PRINT #1, "SCAN_TIME?": GOSUB CheckResponse
LINE INPUT #1, Result$
PRINT #2, Result$
FOR ChannelIndex = 1 TO NumChannels
' Get scan time stamp
' Save time stamp to data file
' Get scan data
PRINT #1, "LAST? " + STR$(ChannelIndex) ' Request channel data
GOSUB CheckResponse
INPUT #1, Result$
' Get channel result
LOCATE ChannelIndex + 2, 25
PRINT "Chan " + STR$(ChannelIndex) + ": ";
PRINT Result$
PRINT #2, Result$ + ",";
' Print results to screen
' Print results to data
file
NEXT ChannelIndex
PRINT #2, ""
' End of line to data file
NEXT Index
WEND
END
op52_2f.eps
Figure 4-6. Sample Program (QBASIC)(2 of 3)
4-60
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4
CheckResponse:
' CHECKRESPONSE Subroutine
' This subroutine checks the Hydra prompt after sending a command to
' Hydra, to see if an error occurred
' The possible responses are:
'
'
'
"=>(CR)(LF)"
"?>(CR)(LF)"
"!>(CR)(LF)"
(command successful)
(command syntax error)
(command execution error)
PROMPT$ = INPUT$(4, #1)
' Get prompt
'Command successful
IF INSTR(1, PROMPT$, "=>") <> 0 THEN RETURN
IF INSTR(1, PROMPT$, "?>") <> 0 THEN
PRINT "Command Syntax Error!"
ELSEIF INSTR(1, PROMPT$, "!>") <> 0 THEN
PRINT "Command Execution Error!"
END IF
PRINT "Program execution halted due to communications errors"
END
op52_3f.eps
Figure 4-6. Sample Program (QBASIC) (3 of 3)
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/*
* HYDRALOG.C Hydra Program to scan VDC, VAC, OHMS, FREQ or TEMP
*
*
*
*
*
*
- initializes RS-232 Communications between PC and Hydra
- configures a number of Hydra channels for one type
of measurement (e.g., VDC, VAC, temperature, etc.)
- scan channels 3 times, and display and record measurement
data on the screen and in file "testdata.prn"
* This program uses routines from the GreenLeaf Communications Library
* (asiopen(), asiputs(), and asigets_timed()) for sending and receiving
* information from the serial port connected to the Hydra. We recommend
* the use of a third-party serial communications library when developing
* C programs to communicate with Hydra instruments over PC serial ports.
*/
/*
* NOTE: Hydra must be set up for RS-232 communications, 1200 baud,
*
no parity, 8 bit data
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "asiports.h"
static FILE *testdata;
/* Greenleaf CommLib include file */
/* File handle for output data file */
main(argc,argv)
int argc;
char *argv[];
{
int ret_code;
/* code returned by various GreenLeaf
communications functions */
unsigned numChannels;
unsigned index;
/* Number of channels to be scanned */
/* counter */
char response[30];
char sendbuff[129];
char recvbuff[129];
/* Buffer for user response */
/* local buffer for transmitting to Hydra */
/* local buffer for receiving from Hydra */
/* Open and initialize COM2, the serial port the Hydra unit is attached
to, for 1200 baud, no parity, 8 it data, and ignore DTR and CTS */
ret_code = asiopen( COM2, (ASINOUT | BINARY | NORMALRX), 1000, 1000,
1200L, P_NONE, 1,8,FALSE,FALSE );
if ( ret_code < ASSUCCESS ) {
fprintf(stderr,"Failed to open the port, Greenleaf error: %d.\n",
ret_code );
exit(1);
}
/*send reset and uninstall */
asiputc (com2, '\x11');
asiputc (com2, '\x03');
checkResponse ();
/* Get prompt */
op53_1f.eps
Figure 4-6. Sample Program (QuickC) (1of 5)
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Computer Operations
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4
asiputs( COM2, "ECHO 0", -2); /* Turn off command echo on Hydra */
checkResponse(); /* Get prompt */
/* Open data file TESTDATA.PRN */
if((testdata = fopen("testdata.prn","w")) == NULL)
{
perror("Cannot open testdata.prn");
exit(1);
}
/* Find out the number of channels the user wants to configure
NOTE: Channel 0 will not be used */
numChannels = 0;
while((numChannels < 1) || (numChannels > 20))
{
fprintf(stdout,"Enter the number of channels to be scanned (1-20):");
gets(response);
numChannels = atoi(response); /* convert ascii response to numeric */
}
/* Turn off unused channels */
fprintf(stdout,"\nWait....\n");
for(index = numChannels + 1; index < 21; ++index)
{
sprintf(sendbuff,"FUNC %d, OFF",index);
asiputs(COM2,sendbuff,-2);
checkResponse();
/* get prompt */
}
/* Print Header and Hydra identification header */
fprintf(stdout,"\n\nSample Program for Hydra\n");
asiputs(COM2,"*IDN?",-2); /* Ask for Hydra identification info */
checkResponse();
/* Get prompt */
asigets_timed(COM2,recvbuff,256,-2,TICKS_PER_SECOND*2); /* Receive Hydra
identification
header */
fprintf(stdout,"%s\n\n",recvbuff);
/*
* Configure channels and scan until user chooses to Quit
*/
while(1)
{
int func;
char configStr[14];
/* Configuration setting */
/* channel function string */
/*
* Configure Hydra Channels
*/
op53_2f.eps
Figure 4-7. Sample Program (QuickC) (2 of 5)
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/* Request channel configuration from user */
fprintf(stdout,"1 = VDC\t\t2 = FAC\t\t3 = OHMS\t4 = FREQ\t5 =
TEMP\t\t6 = Quit\n");
func = 0;
do
{
fprintf(stdout," Selection (1-6): ");
gets(response);
func = atoi(response);
} while((func < 1) || (func > 6));
if(func == 6)
break;
/* If Quit, exit program */
switch(func)
{
/* set configuration string */
case 1:
strcpy(configStr,"VDC,1");
break;
case 2:
strcpy(configStr,"VAC,1");
break;
case 3:
strcpy(configStr,"OHMS,1,2"); /* Assuming 2-terminal channel */
break;
case 4:
strcpy(configStr,"FREQ,1, 1");
break;
case 5:
strcpy(configStr,"TEMP, K"); /* Assuming K thermocouple */
break;
}
/* Send configuration to Hydra */
fprintf(stdout,"Programming Hydra...\n");
for(index = 1;index <= numChannels;++index)
{
sprintf(sendbuff,"FUNC %d,%s",index,configStr);
asiputs(COM2,sendbuff,-2);
checkResponse();
/* get prompt */
}
op53_3f.eps
Figure 4-7. Sample Program (QuickC) (3 of 5)
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Computer Operations
Computer Interface Commands and Operation
4
/*
* Scan and receive data
*/
fprintf(stdout,"\nMeasuring %s...\n",configStr);
for(index=0;index < 3;++index)
{
/* scan three times */
unsigned chanIndex; /* Channel counter */
asiputs(COM2,"*TRG",-2); /* trigger scan */
checkResponse();
/* get prompt */
asiputs(COM2,"SCAN_TIME?",-2); /* request time stamp for scan */
checkResponse();
/* get prompt */
/* receive time stamp for scan, and write to
data file */
asigets_timed(COM2,recvbuff,256,-2,TICKS_PER_SECOND*2);
fprintf(testdata,"%s\n",recvbuff);
for(chanIndex = 1; chanIndex <= numChannels; ++chanIndex)
{
/* get value scanned for each channel */
sprintf(sendbuff,"LAST? %d",chanIndex);
asiputs(COM2,sendbuff,-2); /* request value for channel */
checkResponse(); /* get prompt */
/* receive value for channel and write to
screen and data file */
asigets_timed(COM2,recvbuff,256,-2,TICKS_PER_SECOND*2);
fprintf(stdout,"Chan %d: %s, ",chanIndex,recvbuff);
fprintf(testdata,"%s,",recvbuff);
}
fprintf(stdout,"\n");
fprintf(testdata,"\n");
}
fprintf(stdout,"\n");
fprintf(testdata,"\n");
}
fclose(testdata);
exit(0);
}
op53_4f.eps
Figure 4-7. Sample Program (QuickC)(4 of 5)
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Users Manual
/*
* This function checks the Hydra prompt after sending a command to Hydra,
* to see if an error occurred.
*
* Possible responses are:
*
*
*
"=>(CR)(LF)"
"?>(CR)(LF)"
"!>(CR)(LF)"
(Command successful)
(Command syntax error)
(Command execution error)
*/
static int checkResponse()
{
char response[129];
/* Gets string from Hydra -- asigets_timed
gets characters from the receive buffer,
and strips the (CR)(LF) characters from
the end before placing them in the
"response" buffer */
asigets_timed(COM2,response,128,-2,TICKS_PER_SECOND*2);
/* check to see if the command worked correctly */
if(strcmp(response,"=>") == 0)
return 0;
/* command executed without error */
if(strcmp(response,"?>") == 0)
fprintf(stderr,"Command Syntax Error!\n");
else
{
if(strcmp(response,"!>") == 0)
fprintf(stderr,"Command Execution Error!\n");
}
fprintf(stderr,"\nProgram execution halted due to communications errors\n");
fclose(testdata);
exit(1);
}
op53_5f.eps
Figure 4-7. Sample Program (QuickC)(5 of 5)
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Chapter 5
Printer Operations
Title
Page
Summary of Printer Operations......................................................................... 5-3
Connecting the Instrument to a Printer.............................................................. 5-3
Configuring for Printer Operations ................................................................... 5-5
Problems?...................................................................................................... 5-6
Printing the Review Array ............................................................................ 5-8
5-1
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DATA BUCKET
REVIEW
LAST
HYDRA
CH
mA
mVDCAC
Hz
M
k
V
COM
REVIEW
CLEAR
FILES
MODE
INTVL
SCAN
CLOCK
ALRM
FUNC
Mx+B
SINGLE
300V
MAX
RATE
MON
TOTAL
ZERO
ENTER
LIST
SHIFT
CANCEL
TRIGS
COMM
LOCAL
BATT
BUSY
op83f.eps
5-2
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Printer Operations
Summary of Printer Operations
5
Summary of Printer Operations
Printer operations allow an RS-232 connection between the instrument and a printer to
print out measurement results during scanning, the Review array, and a directory of the
memory card files. The printer must accept a serial data input, either directly or via a
serial-to-parallel converter. Measurement data recorded onto the memory card cannot be
printed out from the instrument (see Memory Card Operations, Chapter 3). The
information in this chapter is provided in three parts:
•
•
•
Connecting the Instrument to a Printer
Configuring for Printer Operations
Printing Measurement Data and Memory Card Directory
Connecting the Instrument to a Printer
The two most common configurations for connecting the instrument to a printer are
shown in Figure 5-1. Printers with an RS-232 serial data interface may be used directly,
while printers with a parallel input require a serial-to-parallel converter. For other
configurations, refer to your printer manual. A complete discussion of RS-232
connections and cables, including cable fabrication information, is provided in Appendix
D.
Note
Several printers use cables that have a DB-25 connector at one end. This
does not necessarily indicate connectivity with the instrument RS-232 port.
Examples include parallel interface printer cables, and 8-pin mini-circular
cables. Check your printer manual before making any connections if there
is doubt about the interface.
5-3
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SERIAL-INPUT
PRINTER
HYDRA
PRINTER
RS-232
DB-25
CONNECTOR
RS-232
(DB-9)
FLUKE RS40 OR RS42 CABLE
RS-232
(DB-25)
(OR EQUAL)
(MALE)
(RS40 MALE
OR RS42 FEMALE)
PRINTER
PARALLEL-INPUT
PRINTER
HYDRA
CENTRONICS-
TYPE
36-PIN
CONNECTOR
SERIAL-TO-PARALLEL
CONVERTER
RS-232
(DB-9)
FLUKE RS40 OR RS42 CABLE
(OR EQUAL)
COM PORT
(DB-25)
(MALE)
(RS40 MALE
OR RS42 FEMALE)
op54f.eps
Figure 5-1. Connecting the Instrument to a Printer
5-4
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Printer Operations
Configuring for Printer Operations
5
Configuring for Printer Operations
Correct operation of the instrument RS-232 link with a printer depends on the link
parameters baud rate, parity, and CTS (Clear To Send). Perform the procedure in Figure
5-3 to establish communication link parameters. Refer to your printer manual for
information on selecting identical parameters for the printer, usually through the setting
of DIP (dual in-line package) switches (with the printer unpowered). The instrument uses
a fixed one start bit and one stop bit.
SHIFT
Selecting the bAUd (Baud) Rate. Press the
SHIFT key, release, and then press the LIST key
bAUd
LIST
to open the communications parameters menu.
The baud rate sets the rate of data transfer
between the instrument and the printer.
Normally, the highest compatible rate is selected.
Select the rate using the up/down arrow keys
then press ENTER.
38400
19200
9600
4800
2400
1200
600
300
ENTER
ENTER
ENTER
ENTER
Selecting PAR (Parity).
The 8th bit of a
PAR
character can be set to make all characters odd
(Odd) or even (E), or no parity at all (no). The
printer checks parity (if selected) and indicates
when an error is detected. Select the parity then
press ENTER.
no
E
Odd
Selecting CtS (Clear To Send). The RS-232
CTS line (pin 8) is an input control line from the
printer Request to Send (RTS) line (pin 4). When
CTS is a Logic high, the instrument is allowed to
transmit data. If the printer RS-232 interface
does not have or use an RTS line, select OFF
then press ENTER.
CtS
On
OFF
Selecting Echo.
When echo is On, each
Echo
character sent to the instrument is "echoed" back
to the host. For this RS-232 application, Echo
has no meaning because the printer does not
send characters to the Hydra.
selection then press ENTER.
On
OFF
Make the
Typical
Required
op55f.eps
Figure 5-2. Configuring the RS-232 Ports for Print Operations
5-5
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2635A
Users Manual
Printing Measurement Data and Memory Card Directory
An RS-232 link between the instrument and a printer allows printing of the following
data:
•
•
•
Printing Measurement Results During Scanning (Figure 5-3)
Printing the Review Array (Figure 5-4)
Printing the Memory Card Directory(Figure 5-5)
The following procedures describe the operation of this link. Before continuing, verify
the instrument and the printer have been properly connected (Figure 5-1), and configured
for operation (Figure 5-2).
Problems?
If the printer does not operate after the RS-232 connection has been made and the
instrument and printer RS-232 parameters have been set, check the following:
1. No characters. No operation of any kind usually indicates a cabling problem,
hardware incompatibility (e.g., connecting to a printer with a parallel input), or the
printer is not on-line and ready for operation (ribbon, paper, power, interlocks, etc.).
2. Incorrect characters. Incorrect printer function (rapid paper feeds, wrong characters)
usually indicates a configuration incompatibility, i.e., the instrument and printer
baud rate and parity don’t match.
3. Missed characters. The Data Bucket Hydra Series II RS-232 port is different from
the RS-232 port on the Data Acquisition Hydra Series II (Model 2620A) and Data
Logger Hydra Series II (Model 2625A), because of the addition of three modem
control lines, CTS, RTS, and DSR (see Appendix D). If the printer occasionally
loses characters, the printer may need to control the data flow from the instrument.
Try enabling CTS "on" to see if this solves the problem.
Printing Measurement Results During Scanning
Perform the procedure in Figure 5-3 to print measurement results during scanning. The
destination for the scanned data can be the printer, memory card, both the printer and the
memory card, or no destination, where the data is saved only in the Review array. The
mode for the printing to the printer or memory card can be all scanned data, scanned data
only when any scanned channel is in alarm, or scanned data only when an alarm
transitions from one alrm stat to another.
5-6
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Printer Operations
Printing Measurement Data and Memory Card Directory
5
SHIFT
FILES
Setting the DESTINATION Parameter. Press
the SHIFT key, release, then press the FILES
key to open the destination menu. Select both
(Both) to route measurement data to both the
memory card and printer; select Print (Printer) to
route measurement data just to the printer. After
selection, press ENTER.
dESt
both
Print
CArd
nonE
ENTER
Selecting the Destination Mode.
destination mode determines when the printer
should print. Select trAns (Transition) to print
The
MOdE
ALL
ALAr
trAnS
one complete scan when
a
channel has
transitioned into or out of an alarm limit. Select
ALAr (Alarm) to print all channel scans while any
channel is in an alarm condition (stopping when
all channels are out of alarm). Select ALL (All) to
print all scans. (See example printout below.)
Typical
Required
ENTER
Channel 3
Scanned Channels
Time
(In High/High Alarm)
(0, 1, 3, 9, 12, 18)
(Hours/Minutes/Seconds)
Date
(Month/Day/Year)
18:29:57 07/21/94
0: 980.19 kOHMS
9: 113.45 mVAC
1: -023.85 VDC
12: 084.32 F
3: 115.23 VAC H/H
L/ 18: 004.19 MX+B /H
ALM:7 DIO:175 TOTAL:0
Digital I/0 Status
(See Table 2-5)
Channel 12
(In Low Alarm)
Channel 18
(In High Alarm)
(Mx+B Scaled)
Alarm Status
(See Table 2-4)
Totalizer Count
(See Figure 2-20)
op56f.eps
Figure 5-3. Printing Measurement Results During Scanning
5-7
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2635A
Users Manual
Printing the Review Array
Perform the procedure in Figure 5-4 to print the Review array, which consists of the last,
maximum, and minimum measurement values during the last scan, and previous scans if
the instrument configuration has not changed or the review array cleared. If the Review
array is blank (cleared), an error message is displayed with an audible "beep." If this
occurs, press C to exit the menu.
LIST
Printing the Review Array. Press the LIST key
to open the List menu. Select LASt (Last) to print
LISt
out the Review array, which consists of the last,
dir
maximum, and minimum values from the most
LASt
recent scan if the instrument configuration has
not changed and the Review array has not been
cleared.
Press ENTER key to print the
An
measurements (see example below).
Error
ENTER
ERROR message appears if the Review array is
cleared (empty).
Typical
Required
CANCL
Time (Hours:Minutes:Seconds)
of Last Recorded Scan
Date (Month/Day/Year)
of Last Recorded Scan
16:51:47 07/21/94
CH
0:
LAST VALUE
399.74 HZ
MAX VALUE
415.63 HZ
MIN VALUE
392.22 HZ
7: -013.91 VDC
-013.88 VDC -013.95 VDC
103.38 mVAC 103.35 mVAC
004.74 MX+B 001.01 MX+B
2.2666 kOHMS 2.2395 kOHMS
12:
103.38 mVAC
001.07 MX+B
2.2451 kOHMS
072.34 F
14:
15:
20:
076.21 F
071.29 F
Channels
Maximum Values
Minimum Values
Last Values
op57f.eps
Figure 5-4. Printing the Review Array
5-8
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Printer Operations
Printing Measurement Data and Memory Card Directory
5
Printing the Directory of the Memory Card
Perform the procedure in Figure 5-5 to print the directory of the memory card files. The
format is similar to a PC directory for a disk drive and will print any files that exist on
the memory card.
LIST
Printing the Memory Card Directory. Press the
LIST key to open the List menu; dir (Directory) is
LISt
selected to print out a directory of all the files on
dir
the memory card. Press ENTER to print the
LASt
directory (example below). If an Err 1 CArd
message appears, this usually indicates a card
is not inserted or the card is unformatted (see
Table 3-1).
Typical
ENTER
Required
File Names
Date (Month/Day/Year) File Created
Time (Hours:Minutes) File Created
SET00.HYD
SET01.HYD
SET02.HYD
DAT00.HYD
DAT01.HYD
DAT02.HYD
730 07-21-1994 08:23
730 07-21-1994 11:16
730 07-21-1994 16:53
1460 07-21-1994 08:43
1042 07-21-1994 12:48
1250 07-21-1994 17:04
6650 BYTES
6 FILE(S)
18586 BYTES FREE
Size of
File in Bytes
Bytes Used and Bytes
Free (Available)
Total Number
of Files
op58f.eps
Figure 5-5. Printing the Memory Card Directory
5-9
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Chapter 6
Modem Operations
Title
Page
Summary of Modem Operations ....................................................................... 6-3
Connecting the Modem to an Instrument .......................................................... 6-6
Testing the RS-232/Modem Interface ............................................................... 6-8
6-1
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2635A
Users Manual
HS AA CD OH RD TD TR MR
REVIEW
LAST
HYDRA
CH
mA
mVDCAC
Hz
M
k
V
COM
REVIEW
CLEAR
FILES
MODE
INTVL
SCAN
CLOCK
ALRM
CANCEL
FUNC
Mx+B
SINGLE
300V
MAX
RATE
MON
TOTAL
ZERO
ENTER
LIST
SHIFT
TRIGS
COMM
LOCAL
BATT
BUSY
op84f.eps
6-2
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Modem Operations
Summary of Modem Operations
6
Summary of Modem Operations
Modem operations allow an RS-232 connection between an instrument and a PC via
modems and telephone lines, instead of a direct RS-232 connection as described in
Chapter 4, "Computer Operations." Due to the wide variety of modems available and
their corresponding software, only the most common connection using a Hayes-
compatible modem using the AT command set is described. This connection can be
adapted to any configuration, following the basic rules in each procedure. A typical
overall connection diagram is shown in Figure 6-1.
Hayes-compatible modems are both configured and controlled by commands from a PC.
Since the Data Bucket does not have the capability to configure a modem, the modem is
configured using a PC, then the PC is removed and the modem is connected to the Data
Bucket. The modem operates in a simple answer mode since calls are never originated
from the instrument. The modem configuration is stored in the modem memory. Some
modems use an internal battery to prevent the erasure of the configuration if the modem
power switch is turned off, while others lose all configuration when the power is turned
off. Check the manual for your modem for an understanding of how the configuration is
maintained.
The information in this chapter is provided in five parts:
•
•
•
•
•
Connecting the Modem to a PC for Configuration
Configuring the Modem for Modem Operations
Connecting the Modem to an Instrument
Configuring the Instrument for Modem Operations
Testing the RS-232/Modem Interface
HYDRA
PC
HYDRA DATA BUCKET
REVIEW
LAST
mA
mVDCAC
CH
k
Hz
COM
V
INTVL
FILES
MODE
REVIEW
CLEAR
300V
MAX
FUNC
Mx+B
ALRM
CANCEL
SCAN
CLOCK
RATE
SINGLE
MON
ENTER
SHIFT
LIST
TOTAL
ZERO
LOCAL
COMM
TRIGS
BUSY BATT
TELEPHONE LINES
MODEM
MODEM
HS AA CD OH RD TD TR MR
HS AA CD OH RD TD TR MR
RS-232
RS-232
op59f.eps
Figure 6-1. Overall PC-to-Instrument Modem Connection
6-3
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2635A
Users Manual
Connecting the Modem to a PC for Modem Configuration
The two most common configurations for connecting the modem to a PC are shown in
Figure 6-2. The modem RS-232 port (DB-25 connector) is cabled to a PC serial COM
port that uses either a DB-9 connector or DB-25 connector. The connecting cable can be
fabricated (See Appendix D) or ordered from Fluke as an option (see Chapter 1).
Configuring the Instrument Modem for Modem Operations
Commands to configure the modem are sent from the PC that is running
communications software. The example below uses the Terminal mode that is available
on any PC that is running Windows software. Modem operation at 2400 baud is assumed
for this procedure, which should be adapted, as required.
1. Start Windows and open TERMINAL on the ACCESSORIES menu.
2. Open the SETTINGS menu and select COMMUNICATIONS.
3. In COMMUNICATIONS, select the following, then use OK to exit to TERMINAL:
Connector COM 1 [Typical]
Baud Rate 2400
Data Bits 8
Stop Bits 1
ParityNone
Flow Control None
4. In TERMINAL, enter a few AT <ENTER> character sequences. If the cable
connection is correct and the modem has LED indicators, the data send and data
receive indicator will blink. If LED blinking is not observed, check the cabling and
verify that the correct PC COM port was selected in step 3.
5. Enter the command ATV1 <ENTER>, which gives result codes in English, instead
of numbers. For example, the AT <ENTER> characters entered in the last step
would display the result code OK.
6. Enter the command ATS0=1 <ENTER>, which configures the modem to answer
calls after one ring. [The 0 character of the S0 portion of the command is the number
zero.]Observe the result code OK.
7. This completes the software configuration of the modem. Check all modem DIP
switches for proper settings. In particular, some modems have a NO ANSWER
switch that must be disabled or the modem will not answer calls. Be sure the modem
remains powered or the configuration data could be lost. Refer to your modem
manual, as required.
6-4
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Modem Operations
Configuring the Instrument Modem for Modem Operations
6
MODEM CONNECTION
WITH PC DB-9
CONNECTOR
MODEM
HS AA CD OH RD TD TR MR
RS-232
(DB-9)
(MALE)
RS-232 PORT
(DB-25)
(FEMALE )
FLUKE RS41 CABLE
(OR EQUAL)
MODEM CONNECTION
WITH PC DB-25
CONNECTOR
MODEM
HS AA CD OH RD TD TR MR
RS-232 PORT
(DB-25)
(FEMALE )
RS-232 PORT
(DB-25)
DB-25 TO DB-9
ADAPTER
FLUKE RS41 CABLE
(OR EQUAL)
(MALE )
op60f.eps
Figure 6-2. Connecting the Modem to a PC
6-5
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2635A
Users Manual
Connecting the Modem to an Instrument
Remove the cable from the PC and connect to the Data Bucket, as shown in Figure 6-3.
If a different cable is used, be sure it is a modem cable.
HYDRA
MODEM
HS AA CD OH RD TD TR MR
FLUKE RS41 CABLE
RS-232
(DB-9)
RS-232 PORT
(DB-25)
(OR EQUAL)
(MALE)
(FEMALE )
op61f.eps
Figure 6-3. Connecting the Modem to an Instrument
6-6
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Modem Operations
Configuring the Instrument for Modem Operations
6
Configuring the Instrument for Modem Operations
Correct operation of the instrument RS-232/modem link depends on the baud rate,
parity, CTS (Clear To Send), and Echo of the link parameters Perform the procedure in
Figure 6-4 to establish the communication link parameters.
SHIFT
Selecting the bAUd (Baud) Rate. Press the
SHIFT key, release, and then press the LIST key
bAUd
LIST
to open the communications parameters menu.
The baud rate sets the rate of data transfer
between the instrument and the modem.
Normally, the highest compatible rate is selected.
Select the rate using the up/down arrow keys
then press ENTER.
38400
19200
9600
4800
2400
1200
600
300
ENTER
ENTER
ENTER
ENTER
Selecting PAR (Parity).
The 8th bit of a
PAR
character can be set to make all characters odd
(Odd) or even (E), or no parity at all (no). The
PC checks parity (if selected) and indicates when
an error is detected. Select the parity then press
ENTER.
no
E
Odd
Selecting CtS (Clear To Send). The RS-232
CTS line is used to control data flow between the
instrument and modem.
applications, CTS is turned On. Make selection
then press ENTER.
CtS
For most modem
On
OFF
Selecting Echo. For this RS-232 application,
Echo OFF is selected. When modem operations
are initiated, any characters sent from the
instrument to the modem before the modem has
experienced "carrier detect" will cause the
modem to suddenly disconnect from the line.
Echo
On
OFF
Typical
Required
op62f.eps
Figure 6-4. Configuring the Instrument RS-232 Port for Modem Operations
6-7
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2635A
Users Manual
Testing the RS-232/Modem Interface
The PC end of the modem link involves a similar procedure of connecting the correct
cable between the PC and modem, and configuring the modem to support the
communications link. This is the responsibility of the user due to the variety of available
modems and software. Be sure the PC COM port has the same parameters as those
selected in Figure 6-4.
When all connections and configurations are complete, the PC should initiate
communications with the modem supporting the instrument using the selected
communications software. Typically, this means selecting a dial feature, or entering an
AT command, e.g., ATDT 123-4567 from the terminal emulation screen. After the
connection is made and the terminal emulation screen is present, enter a few <ENTER>
characters to clear the instrument buffer, and note the instrument => prompts on the
screen. Then enter the command *IDN? <ENTER> (since ECHO OFF was selected in
Figure 6-4, the *IDN? characters will not appear on screen). The return should be
FLUKE,2635A,0,Mn.n An.n Dn.n Ln.n where n.n is replaced with the versions of the
displayed parameters. (See the *IDN? command in Chapter 4 for more information.)The
RS-232/modem link is operating correctly and the PC may now operate using Starter or
Logger applications software, or custom software.
Problems?
If the modem does not operate after making the RS-232 connection, telephone line
connections, and setting the instrument and PC parameters, check the following:
1. No operation of any kind usually indicates a cabling problem, hardware
incompatibility, a modem DIP switch problem, or incorrectly selecting ECHO ON in
Figure 6-4 (ECHO OFF must be selected).
2. Incorrect operation usually indicates a configuration incompatibility, i.e., the
instrument and PC baud rate and parity don’t match.
3. Verify the modem configuration data hasn’t been lost or corrupted. Some modems
use an internal battery to retain configuration data when power is removed, and some
modems lose configuration data if power is removed. If the configuration data is
suspect, repeat the configuration procedures in this chapter.
6-8
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Chapter 7
Maintenance
Title
Page
Introduction ....................................................................................................... 7-3
Cleaning............................................................................................................. 7-3
Line Fuse ........................................................................................................... 7-3
Selftest Diagnostics and Error Codes................................................................ 7-4
Performance Tests............................................................................................. 7-4
Accuracy Verification Test........................................................................... 7-7
Channel Integrity Test................................................................................... 7-8
Four-Terminal Resistance Test..................................................................... 7-10
Digital Input/Output Verification Tests........................................................ 7-15
Digital Output Test ................................................................................... 7-15
Digital Input Test...................................................................................... 7-16
Totalizer Test............................................................................................ 7-17
Totalizer Sensitivity Test.......................................................................... 7-18
Dedicated Alarm Output Test ....................................................................... 7-18
External Trigger Input Test........................................................................... 7-21
Calibration......................................................................................................... 7-21
Variations in the Display................................................................................... 7-22
Service............................................................................................................... 7-22
7-1
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2635A
Users Manual
AC MEASUREMENT
STANDARD
5790A
CALIBRATOR
DATA BUCKET
REVIEW
LAST
HYDRA
CH
mA
mVDCAC
Hz
M
k
V
COM
REVIEW
CLEAR
FILES
MODE
INTVL
SCAN
CLOCK
ALRM
CANCEL
FUNC
Mx+B
SINGLE
300V
MAX
RATE
MON
TOTAL
ZERO
ENTER
LIST
SHIFT
TRIGS
COMM
LOCAL
BATT
BUSY
op85f.eps
7-2
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Maintenance
Introduction
7
Introduction
This chapter describes basic maintenance that the instrument user can perform. Do not
attempt any maintenance not described in this chapter. For additional maintenance,
service, and calibration procedures, qualified service personnel can refer to the Hydra
Series II Service Manual (part number 688868).
Cleaning
WWarning
Keep the instrument dry to avoid electrical shock to personnel
or damage to the instrument. To prevent damage, never apply
solvents to the instrument housing.
For cleaning, wipe the instrument with a cloth that is lightly dampened with water or
mild detergent. Do not use aromatic hydrocarbons, chlorinated solvents, or methanol-
based fluids.
Line Fuse
The instrument uses a type "T" 125 mA, 250V (Slow blow) line fuse in series with the
power supply. To replace this fuse (located on the rear panel), unplug the line cord and
remove the fuse holder with the fuse as shown in Figure 7-1. The instrument is shipped
with a replacement fuse secured in the fuse holder.
Power-Line Cord Connector
To Remove,
Squeeze and
Slide Out
+
–
0
1
2
3
9-16 V
DC PWR
DIGITAL I/O
3
T
R
+30V
0
1
2
!
Complies with the limit for a class B computing device
pursuant to Subpart J of 5 of FC
MEETS 40P8a7r1t 1B
5
6
C Rul7es
Σ
Line Fuse
(T 125 mA, 250V,
Slow Blow)
Fuse Holder
(Spare Fuse Provided)
op63f.eps
Figure 7-1. Replacing the Line Fuse
7-3
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2635A
Users Manual
Selftest Diagnostics and Error Codes
When the instrument is powered up, the entire display lights.
Note
To hold the display fully lit, press and hold the K key, then press R
ON and wait a moment for the instrument to beep. Then release K. The
entire display will now stay on until you press any button; the power-up
sequence then resumes.
Selftest diagnostics are performed each time the instrument is powered up. Any errors
encountered during this initial 4-second period are displayed momentarily. Even in the
presence of an error, the instrument still attempts to complete the selftest routine and
begin normal operation.
An error indicates that a malfunction has occurred and maintenance is required. If you
encounter an error, note the number or letter and consult Table 7-1. See if the instrument
repeats the error. If the problem persists and you intend to repair the instrument yourself,
refer to the Service Manual. Otherwise, package the instrument securely (using the
original container if available.) Then forward the package, postage paid, to the nearest
Fluke/Philips Service Center. Include a description of the problem. Fluke assumes no
responsibility for damage in transit.
Performance Tests
When received, the 2635A Hydra Series II is calibrated and in operating condition. The
following Performance Verification Procedures are provided for acceptance testing upon
initial receipt or to verify correct instrument operation. All tests may be performed in
sequence to verify overall operation, or the tests may be run independently.
If the instrument fails a performance test, calibration adjustment and/or repair is needed.
To perform these tests, you will need a Fluke 5700A Multifunction Calibrator or
equipment meeting the minimum specifications given in Table 7-2.
Table 7-1. Power-Up Error Codes
Error
Description
Boot ROM checksum error
1
2
3
4
5
6
7
8
9
A
b
C
d
Instrument ROM checksum error
Internal RAM test failed
Display power-up test failure
Display not responding
Instrument configuration corrupted
instrument calibration data corrupted
Instrument not calibrated
A/D converter not responding
A/D converter ROM test failure
A/D converter RAM test failure
A/D converter selftest failed
Memory Card interface not installed
7-4
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Maintenance
Performance Tests
7
Each of the measurements listed in the following steps assume the instrument is being
tested after a 1/2 hour warmup, in an environment with an ambient temperature of 18 to
28ºC, and a relative humidity of less than 70%.
Note
All measurements listed in the performance test tables are made in the slow
reading rate unless otherwise noted.
W Warning
The 2635A instrument contains high voltages that can be
dangerous or fatal. Only qualified personnel should attempt to
service the instrument.
7-5
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2635A
Users Manual
Table 7-2. Recommended Test Equipment
Minimum Specification
Instrument Type
Recommended
Model
Multifunction Calibrator
DC Voltage:
Fluke 5700A
Range: 90 mV to 300V dc
Accuracy: .005%
AC Voltage:
Frequency
1 kHz
Voltage
Accuracy
0.05%
29 mV to 300V
15 mV to 300V
100 kHz
Frequency:
10 kHz
1.25%
1V rms
.0125%
Decade Resistance
Source
General Resistance
Inc. Model RDS 66A
Ohms
Accuracy
290Ω
2.9 kΩ
29 kΩ
0.0125%
0.0125%
0.0125%
0.0125%
0.0125%
290 kΩ
2.9 MΩ
Note
The 5700A Calibrator provides 0.05% accuracy
(rated) on the 3.0 kΩ, 30 kΩ, 300 ke and 3.0
MΩ ranges. The 5700A can be used for 0.06%
accuracy on the 300Ω range.
Mercury Thermometer
Thermocouple Probe
0.02 degrees Celsius resolution
Type T
Princo ASTM-56C
Fluke P-20T
Room Temperature
Oil/Water Bath
Thermos bottle and cap
Multimeter
Measures +5V dc
Fluke 77
Signal Generator
Sinewave, 0.5 to 1V rms 10 Hz to 5 kHz
Alternate Equipment List
Fluke 6011A
(Minimum specifications are the same as in the Standard Equipment List)
Instrument Type Recommended Model
DC Voltage Calibrator
Fluke 5700A
DMM Calibrator
Fluke 5100B (for AC Volts only)
Philips PM5193 or Fluke 6011A
Gen Rad 1433H
Function/Signal Generator
Decade Resistance Source
7-6
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Maintenance
Performance Tests
7
Accuracy Verification Test
1. Power up the instrument and allow the temperature to stabilize for 30 minutes.
2. Connect a cable from the Output VA HI and LO connectors of the 5700A to the VΩ
and COM connectors on the front panel of the Hydra Series II. Select the channel 0
function and range on the Hydra Series II and the input level from the 5700A using
the values listed in Table 7-3. Press the M (monitor) button to measure and display
the measurement value for channel 0. The display should read between the minimum
and maximum values listed in the table.
Table 7-3. Performance Tests (Voltage, Resistance, and Frequency)
DISPLAY ACCURACY
FUNCTION
RANGE
INPUT LEVEL
FREQUENCY
(1 Year, 18-28°C)
MIN
MAX
DC Volts
90 mV
90 mV
300 mV
300 mV
300 mV
3V
short (0)
90 mV
0V
--
-0.006
89.972
-0.02
0.006
--
90.028
0.02
--
150 mV
290 mV
2.9V
--
149.94
289.91
2.8991
-2.9009
28.991
149.94
289.91
150.06
290.09
2.9009
-2.8991
29.009
150.06
290.09
--
--
-3V
-2.9V
29V
--
30V
-
150V
300V
150V
290V
--
--
NOTE
Voltages greater than 150V can only be applied to channels 0,1, and 11.
AC Volts
300 mV
300 mV
300 mV
3V
20 mV
20 mV
290 mV
290 mV
2.9V
1 kHz
100 kHz
1 kHz
19.71
18.50
20.29
21.50
289.28
275.00
2.8937
28.931
149.54
289.34
290.72
305.00
2.9063
29.069
150.46
290.66
100 kHz
1 kHz
3V
30V
29V
1 kHz
150V
300V
150V
1 kHz
290V
1 kHz
NOTE
Voltages greater than 150V can only be applied to channels 0, 1, and 11. The rear Input Module must
be installed when measuring ac volts on channel 0.
NOTE
For 2-terminal measurements, the resistance accuracy given in this table applies to Channel 0 and
makes allowance for up to 0.05 ohm of lead wire resistance. You must add any additional lead wire
resistance present in your set up to the resistance values given in this table.
Resistance
Using inputs in decades of 3:
300 e
short
300e
short
0.00
0.09
299.90
0.0000
2.9989
29.990
299.88
2.9979
300.15
0.0003
3.0011
30.010
300.12
3.0021
3 ke
3 ke
30 ke
300 ke
3 Me
30 ke
300 ke
3 Me
7-7
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Table 7-3. Performance Tests (Voltage, Resistance, and Frequency) (cont)
Using inputs in decades of 1.9:
300 e
short
190 e
short
0.00
0.09
189.93
0.0000
1.8992
18.992
189.91
1.8983
190.12
0.0003
1.9008
19.008
190.09
1.9017
3 ke
1.9 ke
19 ke
190 ke
1.9 Me
30 ke
300 ke
3 Me
Using inputs in decades of 1:
300 e
short
0.00
99.95
0.0000
0.9995
9.995
99.94
0.9990
9.979
0.09
100 e
100.10
0.0003
1.0006
10.005
100.06
1.0010
10.021
3 ke
short
1 ke
30 ke
300 ke
3 Me
10 ke
100 ke
1 Me
10 Me*
10 Me
*Optional test point if standards available.
NOTE
All channels (0 through 20) can accommodate 2-terminal resistance measurements. Channel 0, with
only two connections, cannot be used for 4-terminal measurements. Four-terminal resistance
measurements can be defined for channels 1 through 10 only. Channels 11 through 20 are used, as
required, for 4-terminal to provide the additional two connections. For example, a 4-terminal set up on
channel 1 uses channels 1 and 11, each channel providing two connections.
Frequency
90 kHz/2V
p-p
10kHz
9.994
10.006
Channel Integrity Test
Ensure that the Accuracy Verification Test for channel 0 meets minimum acceptable
levels before performing this test.
1. Switch OFF power to the instrument and disconnect all high voltage inputs.
2. Remove the Input Module from the rear of the instrument. Open the Input Module
and connect a pair of test leads to the H (high) and L (low) terminals of channel 1.
Reinstall the Input Module into the instrument.
3. Connect the ends of the test leads together to apply a short (0 ohms).
4. Reconnect power and switch the instrument ON.
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Maintenance
Performance Tests
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5. For channel 1, select the two-terminal ohms function and 300 ohms range on the
Hydra Series II. Press M and ensure the display reads a resistance of less than or
equal to 4.0 ohms. (This test assumes that lead wire resistances are less than 0.1Ω.)
6. Open the ends of the test leads and ensure that the display reads OL" (overload).
7. Press M.This will stop the measurement.
8. Connect a cable from the Output VA HI and LO of the 5700A to the Input Module
test leads (observe proper polarity).
9. Select the VDC function and 300 volt range on the Hydra Series II and first apply
0V dc then 290V dc input from the 5700A. Ensure the display reads between the
minimum and maximum values as shown in Table 7-3 for the 0 and 290V dc input
levels.
Note
Channels 0, 1, and 11 have a maximum input of 300V dc or ac (rms). The
maximum input for all other channels is 150V dc or ac (rms).
10. With the exception of the selected voltage range and input voltage from the 5700A,
repeat steps 1 through 9 for each remaining Input Module channel (2 through 20).
Channels 2 through 10 and 12 through 20 should be configured for the 150V dc
range and an input voltage of 150 volts.
Thermocouple Measurement Range Accuracy Test
Ensure that the Accuracy Verification Test for channel 0 meets minimum acceptable
levels before performing this test.
Thermocouple temperature measurements are accomplished using Hydra Series II’s 90
mV and internal 900 mV dc ranges. (The 900 mV range is not configurable from the
instrument front panel.) This procedure will provide the means to test these ranges.
Testing the 900 mV dc range requires computer interfacing with a host (terminal or
computer). The host must send commands to select this range. This range cannot be
selected from the Hydra Series II front panel.
1. Ensure that communication parameters ( i.e., transmission mode, baud rate, parity,
CTS, and echo mode) on the Hydra Series II and the host are properly configured to
send and receive serial data. Refer to Chapter 4 "Computer Operations."
2. Power up Hydra Series II and allow the temperature to stabilize for 30 minutes.
3. Connect a cable from the Output VA HI and LO connectors of the 5700A to the VΩ
and COM connectors on the front panel of the Hydra Series II.
4. Set the 5700A to output 0V dc.
5. Using either a terminal or a computer running a terminal emulation program as the
selected host, send the following commands to Hydra Series II:
FUNC 0,VDC,5 <CR>
MON 1,0 <CR>
MON_VAL? <CR>
The returned value for channel 0 should be 0 mV ±0.006 mV.
Set the 5700A to output 90 mV DC. Send the following command:
MON_VAL? <CR>
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The value returned should now be 90 mV ±0.028 mV (between 89.97 and
90.028 mV).
6. Change Hydra Series II's channel 0 function to the internal 900 mV dc range by
redefining channel 0. Send the following commands:
MON 0 <CR>
FUNC 0,VDC,6 <CR>
Set the 5700A to output 0.9V dc. Send the following commands:
MON 1,0 <CR>
MON_VAL? <CR>
The value returned should be 900 mV ±0.21 mV (899.79 to 900.21mV.)
Four-Terminal Resistance Test
Ensure that Channel 0's Accuracy Verification Test for DC Volts and Resistance meets
minimum acceptable levels.
1. Switch OFF power to the instrument and disconnect all high voltage inputs.
2. Remove the Input Module from the rear of the instrument. Open the Input Module
and connect a pair of test leads (keep as short as possible) to the H (high) and L
(low) terminals of channel 1, and connect a second pair of test leads to the H and L
terminals of channel 11. Reinstall the Input Module into the instrument.
3. Observing polarity connect channel 1's test leads to the Sense HI and LO terminals
of the 5700A, and connect channel 11's test leads to the Output HI and LO terminals
of the 5700A. Connect as shown in Figure 7-2.
4. Switch the instrument ON.
5. Select the Four-terminal OHMS function, AUTO range, for channel 1 on the Hydra
Series II.
6. Set the 5700A to output the resistance values listed in Table 7-3 (Use decades of
1.9).
7. On Hydra Series II press M and ensure the display reads between the minimum
and maximum values shown on Table 7-3.
8. The Four-terminal Resistance Test is complete. However, if you desire to perform
this test on Input Module channels (2 through 10), repeat steps 1 through 7,
substituting the appropriate channel number.
Note
Four-Terminal connections are made using pairs of channels. Four-
terminal measurements can be made only on channels 1 though 10 (n). The
accompanying pairs are channels 11 through 20 (n+10).
Thermocouple Temperature Accuracy Test
Ensure that the Thermocouple Measurement Range Accuracy Test meets minimum
acceptable levels before performing this test.
1. Switch OFF power to the instrument and disconnect all high voltage inputs.
2. Remove the Input Module from the rear of the instrument. Open the Input Module
and connect a T-type thermocouple to the H (blue lead) and L (red lead) terminals of
channel 1. Reinstall the Input Module into the instrument.
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Maintenance
Performance Tests
7
Note
If other than a T-type thermocouple is used, be sure that the instrument is
set up for the type of thermocouple used.
3. Reconnect power and switch the instrument ON.
4. Insert the thermocouple and a mercury thermometer in a room temperature bath.
Allow 20 minutes for thermal stabilization.
5. Select the temperature and T-type thermocouple function for channel 1.Press M.
6. The value displayed should be the temperature of the room temperature bath as
measured by the mercury thermometer (within tolerances given in Table 7-4, plus
any sensor inaccuracies.).
7. The Thermocouple Temperature Accuracy Test is complete. However, if you desire
to perform this test on any other Input Module channel (2 through 20), repeat steps 1
through 6, substituting the appropriate channel number.
Open Thermocouple Response Test
1. Switch OFF power to the instrument and disconnect all high voltage inputs.
2. Remove the Input Module from the rear of the instrument. Open the Input Module
and connect test leads to the H (high) and L (low) terminals of channel 1. Reinstall
the Input Module into the instrument.
Table 7-4. Performance Tests for Thermocouple Temperature Function (ITS-90)
Thermocouple Type
Thermocouple Accuracy Specifications 1 Year
@ 18-28 Degrees C
J
K
N
E
T
±0.40°C
±0.44°C
±0.53°C
±0.38°C
±0.45°C
1. Reconnect power and switch the instrument ON.
2. Connect the test leads from the Input Module to an 820 ohm resistor.
3. Select the temperature and T-type thermocouple function for channel 1.Press M.
4. The value displayed should approximate the ambient temperature.
5. Replace the 820 ohm resistor with a 4 kilohm resistor to simulate a high resistance or
open thermocouple.
6. Verify a reading of "otc".
7. The Open Thermocouple Response Test is complete. However, if you desire to
perform this test on any other Input Module channel (2 through 20), repeat steps 1
through 8, substituting the appropriate channel number.
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11 12 13 14 15 16 17 18 19 20
H L H L H L H L H L H L H L H L H L H L
SOURCE
(4-WIRE)
HYDRA
INPUT
MODULE
H L H L H L H L H L H L H L H L H L H L
SENSE
(4-WIRE)
1
2
3
4
5
6
7
8
9
10
5700A
OUTPUT
SENSE
V
Ω
A
V
Ω
WIDEBAND
HI
HI
LO
HI
LO
AUX
CURRENT
ARD
GROUND
NC
NC
2-WIRE
COMP
OFF
: ON
: OFF
EX SNS
EX GRD
SENSE
SOURCE
UUT
5700A
SOURCE
SENSE
op64f.eps
Figure 7-2. Four-Terminal Connections to 5700A
7-12
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Maintenance
Performance Tests
7
RTD Temperature Accuracy Test
The following two RTD Temperature Accuracy Tests are different in that one test uses a
Decade Resistance Source and the other uses an RTD. Only one of the tests need to be
performed to assure operation.
RTD Temperature Accuracy Test (Using Decade Resistance Source)
Ensure that Channel 0’s Accuracy Verification Test for DC Volts and 300 Ohm
Resistance Range meets minimum acceptable levels.
1. Switch OFF power to the instrument and disconnect all high voltage inputs.
2. Remove the Input Module from the rear of the instrument. Open the Input Module
and connect a pair of test leads (keep as short as possible) to the H (high) and L
(low) terminals of channel 1. For Four-terminal performance testing, connect a
second pair of test leads to the H (high) and L (low) terminals of channel 11.
Reinstall the Input Module into the instrument.
3. Connect channel 1’s test leads to the Output HI and LO terminals of the Decade
Resistance Source. For Four-terminal performance testing, also connect channel 11’s
test leads to the Output HI and LO terminals of the Decade Resistance Source.
Connect as shown in Figure 7-3.
Note
Four-terminal connections are made using pairs of channels. Four-
terminal measurements can be made only on channels 1 though 10 (n). The
accompanying pairs are channels 11 through 20 (n+10).
4. Switch the instrument ON.
5. Select the Four-terminal RTD temperature function, RTD type PT, for channel 1 on
the Hydra Series II. Press M, select a Decade Resistance value, and ensure the
display reads between the minimum and maximum values shown on Table 7-5.
6. The RTD Temperature Accuracy test is complete. However if you desire to perform
this test on Input Module channels (2 through 10), repeat steps 1 through 5,
substituting the appropriate channel number.
Note
The only type of temperature measurement that can be made on channel 0
is two-terminal RTD. Channels 11 through 20 will support only two-
terminal RTDs.
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4-WIRE (4T) CONNECTION
11 12 13 14 15 16 17 18 19 20
H L H L H L H L H L H L H L H L H L H L
SOURCE
(4-WIRE)
HYDRA
INPUT
MODULE
H L H L H L H L H L H L H L H L H L H L
SENSE
(4-WIRE)
1
2
3
4
5
6
7
8
9
10
DECADE
RESISTANCE
BOX
op65f.eps
Figure 7-3. Four-Terminal Connections to Decade Resistance Box
Table 7-5. Performance Tests for RTD Temperature Function (Resistance Source) (DIN/IEC 751
Amendment 2) (ITS-90)
DECADE RESISTANCE
SOURCE
TEMPERATURE SIMULATED
TEMPERATURE ACCURACY
1 YEAR @ 18-28°C
°C
100 e
200 e
300 e
0
± 0.12°C
± 0.22°C
± 0.37°C
266.35
557.69
These figures assume that RTD R0 is set to 100.00 ohms for each channel.
Accuracy given is for 4-wire measurements only. For 2-wire measurements, degrade the accuracy
specifications by 5.2 °C per ohm of single lead wire resistance. For 2-wire measurements, degrade the
accuracy by an additional 11°C (channels 1 .. 20)or 0.05°C (channel 0).
RTD Temperature Accuracy Test (Using DIN/IEC 751 RTD)
1. Switch OFF power to the instrument and disconnect all other high voltage inputs.
2. Remove the Input Module from the rear of the instrument. Open the Input Module
and connect a Platinum RTD, conforming to the European Standards IEC 751 (DIN
43760).
Two-terminal RTD: Connect the RTD’s excitation leads to the H (high) and L (low)
terminals of channel 1.
Four-terminal RTD: Connect the RTD’s excitation leads (one red and one black
wire) to the H (high) and L (low) terminals of channel 1. Connect the RTD’s second
pair of red and black leads to the H and L leads of channel 11. (Refer to Figure 7-3
for proper connection.) Reinstall the Input Module into the instrument.
7-14
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Maintenance
Performance Tests
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Note
Four-terminal connections are made using pairs of channels. Four-
terminal measurements can be made only on channels 1 though 10 (n).
Their accompanying pairs are channels 11 through 20 (n+10).
3. Switch the instrument ON.
4. Insert the RTD probe and a mercury thermometer in a room temperature bath. Allow
20 minutes for thermal stabilization.
5. Dependent on the type of connection made in step 2, select either the two-terminal or
four-terminal RTD temperature function, RTD type PT (DIN/IEC 751), for channel
1 on the Hydra Series II. Press M and ensure the display reads the temperature of
the room temperature bath (within tolerances shown in Table 7-6) as measured by
the mercury thermometer.
6. The RTD Temperature Accuracy test is complete. However if you desire to perform
this test on any other channel (0 or 2 through 20) repeat steps 1 through 5
substituting the appropriate channel number.
Note
The only type of temperature measurement that can be made on channel 0
is two-terminal RTD. Channels 11 through 20 will support only two-
terminal RTDs.
Table 7-6. Performance Tests for RTD Temperature Function (DIN/ IEC 751 Amendment 2)(ITS-90)
RTD TYPE
TEMPERATURE ACCURACY
SPECIFICATIONS 1 YEAR @ 18-28°C
2-wire (channel 0)
-0.54°C to 0.59°C
-0.54°C to 11.54°C
±0.54°C
2-wire (channels 1-20)
4-wire
Assumes RTD R0 is set to 100.00 e for each channel.
Digital Input/Output Verification Tests
Digital Input/Output verification testing requires computer interfacing with a host
(terminal or computer). The host must send commands to the instrument to control the
digital lines for this test. Refer to Chapter 4 for a description of configuring and
operating the instrument.
Digital Output Test
1. Ensure that communication parameters ( i.e., transmission mode, baud rate, parity,
CTS, and echo mode) on the Hydra Series II and the host are properly configured to
send and receive serial data. Refer to Chapter 4.
2. Switch OFF power to the instrument and disconnect all high voltage inputs.
3. Remove the Digital I/O ten terminal connector from the rear of the instrument and
all external connections to it. Connect short wires (to be used as test leads) to the
GROUND and 0 through 7 terminals. Leave the other wire ends unconnected at this
time. Reinstall the connector.
4. Switch power ON to both Hydra Series II and the host. Verify that Hydra Series II is
not scanning. If Hydra Series II is scanning, press Q to turn scanning off, then
cycle power off-on again.
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5. Using a digital multimeter (DMM), verify that all digital outputs (0-7) are in the
OFF or HIGH state. This is done by connecting the low or common of the
multimeter to the ground test lead and the high of the multimeter to the digital output
and verifying a voltage greater than +3.8V dc.
6. Using either a terminal or a computer running a terminal emulation program, set up
Hydra Series II to turn Digital Outputs ON (LOW state).
In sequence send the following commands to Hydra Series II and measure that the
correct Digital Output line transitioned LOW measures less than+0.8V dc.
DO_LEVEL 0,0 <CR>
Ensure that output 0 measures a LOW state.
DO_LEVEL 1,0 <CR>
Ensure that output 1 measures a LOW state.
DO_LEVEL 2,0 <CR>
Ensure that output 2 measures a LOW state.
Repeat the command for all eight outputs.
7. Set up Hydra Series II to turn Digital Outputs OFF (HIGH state).
In sequence send the following commands to Hydra Series II and measure that the
correct Digital Output line transitioned HIGH measures greater than +3.8V dc.
DO_LEVEL 0,1 <CR>
Ensure that output 0 measures a HIGH state.
DO_LEVEL 1,1 <CR>
Ensure that output 1 measures a HIGH state.
Repeat the command for all eight outputs.
Digital Input Test
1. Perform the DIGITAL OUTPUT TEST steps 1 through 5.
2. Using either a terminal or a computer running a terminal emulation program, set up
Hydra Series II to read the Digital Input lines.
Send the following command to Hydra Series II:
DIO_LEVELS? <CR>
Verify that the returned value is 255.
Note
The number returned is the decimal equivalent of the Digital Input binary
word (inputs 0 through 7’s status). See Table 7-7 to determine if the
number returned corresponds to the bits jumpered to ground in this test.
3. Jumper input 0 to ground by connecting the ground test lead to input 0’s test lead.
Then send the following command to Hydra Series II:
DIO_LEVELS? <CR>
Verify that the returned value is 254.
4. Disconnect input 0 from ground then jumper input 1 to ground.
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Maintenance
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Send the command: DIO_LEVELS? <CR>
Verify the returned value is 253.
5. Repeat step 4 for each input and verify the correct returned value (See Table 7-7).
Table 7-7. Digital Input Values
TERMINAL GROUNDED
STATE OF DIGITAL INPUTS
inputs 0-7, all HIGH
DECIMAL VALUE
none
255
254
253
251
247
239
223
191
127
0
1
2
3
4
5
6
7
inputs 1-7 HIGH, input 0 LOW
inputs 0,2-7 HIGH, input 1 LOW
inputs 0-1 and 3-7 HIGH, input 2 LOW
inputs 0-2 and 4-7 HIGH, input 3 LOW
inputs 0-3 and 5-7 HIGH, input 4 LOW
inputs 0-4 and 6-7 HIGH, input 5 LOW
inputs 0-5 and 7 HIGH, input 6 LOW
inputs 0-6 HIGH, input 7 LOW
Totalizer Test
This totalizer verification test requires toggling the Digital Output line 0 and using it as
the Total input. The test requires computer interfacing with a host (terminal or
computer). The host must send commands to the 2635A instrument to control the digital
line for this test. Refer to Chapter 4 for a description of configuring and operating Hydra
Series II.
1. Ensure that communication parameters ( i.e., transmission mode, baud rate, parity,
CTS, and echo mode) on Hydra Series II and the host are properly configured to
send and receive serial data. Refer to Chapter 4.
2. Switch OFF power to the instrument and disconnect all high voltage inputs.
3. Remove the Digital I/O ten-terminal connector from the rear of the instrument and
all external connections to it. Connect short wires (to be used as test leads) to the
DIGITAL I/O terminal 0 and the Total (SUM) terminal. Leave other ends of wires
unconnected at this time. Reinstall the connector.
4. Switch ON power to both Hydra Series II and the host.
5. Press the O button on the front panel of Hydra Series II.
Ensure that Hydra Series II displays a 0 value.
6. Jumper the DIGITAL I/O terminal 0 to the Total (SUM) input by connecting the
(SUM) terminal test lead to DIGITAL I/O 0’s test lead.
7. Using either a terminal or a computer running a terminal emulation program, set up
Hydra Series II to toggle (turn ON and OFF) Digital Output 0.
In sequence send the following commands to Hydra Series II and ensure that Hydra
Series II measures and displays the correct total value:
DO_LEVEL 0,0 <CR>
DO_LEVEL 0,1 <CR>
Ensure that Hydra Series II displays a totalizer count of 1.
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8. Again in sequence, send the commands:
DO_LEVEL 0,0 <CR>
DO_LEVEL 0,1 <CR>
Hydra Series II should now display a totalizer count of 2.
9. Repeat step 8 for each incremental totalizing count.
10. Set the Hydra Series II’s totalized count to a value near full range (65535) and test
for overload.
Send the following commands to Hydra Series II:
TOTAL 65534 <CR>
DO_LEVEL 0,0 <CR>
DO_LEVEL 0,1 <CR>
A totalizer count of 65535 should be displayed.
11. Send:
DO_LEVEL 0,0 <CR>
DO_LEVEL 0,1 <CR>
Hydra Series II’s display should now read "OL". This indicates that the counter has
changed from its maximum count (65535) to zero (0) and has set the Totalize
Overflow bit in the Instrument Event Register.
Totalizer Sensitivity Test
1. Perform the Totalizer Test and ensure that it is operational.
2. Remove the jumper connecting the (SUM) terminal test lead to output 0’s test lead.
3. Ensure that Hydra Series II is still in the totalize display mode. If not, press the O
button. Reset the totalizer count shown on the display by pressing Hydra Series II’s
front panel K button followed by O (ZERO) button.
Hydra Series II’s display should now show a value of 0.
4. Connect the output of the signal generator to the SUM and GROUND terminals.
5. Program the signal generator to output a 1.5V rms sine signal at 10 Hz.
Hydra Series II’s display should now show the totalizing value incrementing at a 10
count per second rate.
Dedicated Alarm Output Test
The Dedicated Alarm Output Test verifies that Alarm Outputs 0 through 3 are
functioning properly. Because this test is dependent on voltage readings, the Accuracy
Verification Test for channel 0 and the Channel Integrity Test for channels 1 through 3
should be performed if voltage readings are suspect.
1. Switch OFF power to the instrument and disconnect all high voltage inputs.
2. Remove the Alarm Output eight-terminal connector module from the rear of Hydra
Series II and all external connections to it. Connect short wires (to be used as test
leads) to the GROUND and 0 through 3 terminals. Leave other ends of wires
unconnected at this time. Reinstall the connector.
7-18
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Maintenance
Performance Tests
7
3. Remove the Input Module from the rear of Hydra Series II. Open the Input Module
and jumper the H (high) terminal of channels 1, 2, and 3 together. Connect a test
lead to the H of channel 1. Also jumper the L (low) terminals of channel 1, 2, and 3
together. Connect a second test lead to the L of channel 1. Reinstall the Input
Module into Hydra Series II. Refer to Figure 7-4.
4. Switch power ON.
5. Using a digital multimeter (DMM), verify that alarm outputs 0 through 3 are in the
OFF or HIGH state. Perform this test by connecting the low or common of the
multimeter to the ground test lead and the high of the multimeter to the alarm output.
Verify a voltage greater than +3.8V dc.
6. Connect a cable from the Output VA HI and LO connectors of the 5700A to the VΩ
and COM connectors on the front panel of Hydra Series II. Then jumper Hydra
Series II’s VΩ terminal to the H (high) test lead of the Input Module and the COM
terminal to the L (low) test lead.
7. On Hydra Series II, select the VDC function, 3V range, and assign a HI alarm limit
of +1.0000 for channels 0 through 3. Set up all other channels (4-20) to the OFF
function. Select a scan interval of 5 seconds.
8. Set the 5700A to output +0.9900 volts.
9. Press Hydra Series II’s Q button. Hydra Series II should scan channels 0 through 3
every 5 seconds.
10. Using a digital multimeter, again verify that alarm outputs 0 through 3 are in the
OFF or HIGH state.
11. Set the 5700A to output +1.1000 volts. Verify that the alarm outputs 0 through 3 are
in the ON or LOW state (measure less than +0.8V dc).
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ALARM OUTPUTS
DIGITAL I/O
ALARM
OUTPUT
CONNECTOR
+ –
9-16 V
0
1
2
3 TR
0
1
2
3
4
5
6
7
Σ
+30V
!
DC PWR
0
1 2 3 GND
11 12 13 14 15 16 17 18 19 20
H L H L H L H L H L H L H L H L H L H L
SOURCE
(4-WIRE)
INPUT
MODULE
H L H L H L H L H L H L H L H L H L H L
SENSE
(4-WIRE)
1
2
3
4
5
6
7
8
9
10
5700A
HYDRA
FRONT PANEL
OUTPUT
SENSE
V
Ω
V A
Ω
WIDEBAND
HI
HI
REVIEW
LAST
LO
LO
COM
V
Ω
HI
FUNC
ALRM
300V
MAX
AUX
CURRENT
GUARD GROUND
Mx+B
(USE STACKED
BANANA JACKS)
op66f.eps
Figure 7-4. Dedicated Alarms Output Test
7-20
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Maintenance
Calibration
7
External Trigger Input Test
The External Trigger Input Test verifies that the rear panel trigger input of Hydra Series
II is functioning properly.
1. Switch OFF power to the instrument and disconnect all high voltage inputs.
2. Remove the Alarm Output eight terminal connector module from the rear of Hydra
Series II and all external connections to it. Connect short wires (to be used as test
leads) to the GROUND and TR terminals. Leave other ends of wires unconnected at
this time. Reinstall the connector. Refer to Figure 7-5.
3. Switch power ON.
4. On Hydra Series II, select the VDC function, 30V range for channels 0 through
5.Select a scan interval of 30 seconds.
5. Select trigger ON to enable the external trigger input. Press the K and M
(TRIGS) buttons (the display shows TRIG), then press either the up or down arrow
buttons to display ON. Press E.
6. Press Hydra Series II’s Q button. Hydra Series II should scan channels 0 through 5
once every 30 seconds.
7. During the interval when scanning is not occurring, connect (short) the test leads of
the TR and ground Alarm Output terminals.
Ensure the connection causes a single scan to occur.
8. Disconnect (open) the TR and ground connection.
Ensure the scan continues to execute at its specified interval.
ALARM OUTPUTS
DIGITAL I/O
+ –
9-16 V
0
1
2
3 TR
0
1
2
3
4
5
6
7
Σ
+30V
!
DC PWR
op67f.eps
Figure 7-5. External Trigger Test
Calibration
Note
Refer to the Fluke Hydra Series II Service Manual (P/N 688868) for
calibration procedures. The instrument must be stabilized in an
environment with an ambient temperature of 22 to 24ºC and a relative
humidity of less than 70% and must have been turned on for at least 30
minutes prior to calibration.
The instrument features closed-case calibration controlled over the Computer Interface.
Using known reference sources, closed-case calibration has many advantages. There are
7-21
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2635A
Users Manual
no parts to disassemble, no mechanical adjustments to make, and the instrument can be
calibrated by an automated instrumentation system.
The instrument should normally be calibrated on a regular cycle, typically every 90 days
or 1 year. The chosen calibration cycle depends on the accuracy specification you wish
to maintain. The instrument should also be calibrated if it fails the performance test or
has undergone repair.
Note
Do not press CAL ENABLE unless you have a copy of the Service Manual
and intend to calibrate the instrument. If you have activated calibration
and wish to exit calibration, press CAL ENABLE until CAL disappears
from the display (or press power OFF).
Refer to the Hydra Series II Service Manual for the essential calibration procedures.
Variations in the Display
Under normal operation, the display presents various combinations of brightly and dimly
lit annunciators and digits. However, you may encounter other, random irregularities
across different areas of the display under the following circumstances:
•
•
After prolonged periods of displaying the same information.
If the display has not been used for a prolonged period.
This phenomenon can be cleared by activating the entire display and leaving it on
overnight (or at least for several hours). Use the following procedure to keep the display
fully lit:
1. With power OFF, press and hold K, then press power ON.
2. Wait a moment for the instrument to beep, then release K.The entire display will
now stay on until you are ready to deactivate it.
3. At the end of the activation period, press any button on the front panel; the
instrument resumes the mode in effect prior to the power interruption (Active or
Inactive).
Service
If the instrument fails, check that operating instructions presented earlier in this manual
are being followed. If the problem cannot be remedied, forward the instrument, postage
paid, to the nearest Fluke/Philips Service Center. Be sure to pack the instrument
securely; use the original container if available. Include a description of the problem.
Fluke assumes NO responsibility for damage in transit.
To locate an authorized service center, visit us on the World Wide Web: www.fluke.com
or call Fluke using any of the phone numbers listed below.
1-800-44-FLUKE (1-800-443-5853) in U.S.A. and Canada
+31 402-678-200 in Europe
+81-3-3434-0181 Japan
+65-*-276-6196 Singapore
+1-425-356-5500 in other countries
7-22
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Appendices
Appendix
Title
Page
A
B
C
D
E
F
Specifications....................................................................................................... A-1
Crosstalk Considerations ..................................................................................... B-1
Binary Upload of Logged Data............................................................................ C-1
RS-232 Cabling.................................................................................................... D-1
8-Bit Binary-Coded-Decimal Table..................................................................... E-1
Memory Card File Formats.................................................................................. F-1
True RMS Measurements.................................................................................... G-1
G
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Appendix A
Specifications
Introduction
The instrument specifications presented here are applicable within the conditions listed
in the Environmental chapter.
The specifications state total instrument accuracy following calibration, including:
•
•
•
•
•
•
•
•
A/D errors
Linearization conformity
Initial calibration errors
Isothermality errors
Relay thermal emf’s
Reference junction conformity
Temperature coefficients
Humidity errors
Sensor inaccuracies are not included in the accuracy figures.
Accuracies at Ambient Temperatures Other than Specified
To determine typical accuracies at temperatures intermediate to those listed in the
specification tables, linearly interpolate between the applicable 0ºC to 60ºC and 18ºC to
28ºC accuracy specifications.
Response Times
Refer to Typical Scanning Rate and Maximum Autoranging Time later in this Appendix.
DC Voltage Measurements
Resolution
See Table A-1
A-1
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2635A
Users Manual
Table A-1. DC Voltage Measurements - Resolution
Range
Resolution
Slow
Fast
90 mV*
300 mV
3V
1 µV
10 µV
0.1 mV
1 mV
10 µV
0.1 mV
1 mV
30V
10 mV
0.1 V
300V
10 mV
10 µV
900 mV**
0.1 mV
*
Not used in Autoranging
*** Computer interface only (see FUNC command).
Accuracy
See Table A-2.
Table A-2. DC Voltage Measurements - Accuracy
ACCURACY ±(%±V)
RANGE
18°C TO 28°C
0°C TO 60°C
90 DAYS
SLOW
1 YEAR
SLOW
1 YEAR
FAST
1 YEAR
SLOW
1 YEAR
FAST
90 mV*
300 mV
3V
.019% + 6 µV
.018% + 20 µV
.019% + 0.2 mV
.019% + 2 mV
.019% + 20 mV
.016% + 20 µV
.024% + 6 µV
.023% + 20 µV
.024% + 0.2 mV
.024% + 2 mV
.024% + 20 mV
.021% + 20 µV
.044% + 20 µV
.040% + 0.2 mV
.041% + 2 mV
.041% + 20 mV
.041% + 0.2 V
.037% + 0.3 mV
.068% + 6 µV
.067% + 20 µV
.065% + 0.2 mV
.086% + 2 mV
.087% + 20 mV
.064% + 20 µV
.088% + 20 µV
.084% + 0.2 mV
.082% + 2 mV
.103% + 20 mV
.104% + 0.2 V
.096% + 0.3 mV
30V
150/300V
900 mV* **
* Not used in Autoranging.
** Computer interface only (see FUNC command).
Input Impedance
100 Me minimum in parallel with 150 pF maximum for all ranges 3V and below 10 Me
in parallel with 100 pF maximum for the 30V and 300V ranges
Normal Mode Rejection
53 dB minimum at 60 Hz ±0.1%, slow rate
47 dB minimum at 50 Hz ±0.1%, slow rate
Common Mode Rejection
120 dB minimum at dc, 1 ke imbalance, slow rate
120 dB minimum at 50 or 60 Hz ±0.1%, 1 ke imbalance, slow rate
A-2
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Appendices
Specifications
A
Maximum Input
300V dc or ac rms on any range for channels 0,1, and 11
150V dc or ac rms for channels 2 to 10 and 12 to 20
Voltage ratings between channels must not be exceeded.
Cross-Talk Rejection
Refer to Appendix B.
A-3
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2635A
Users Manual
AC Voltage Inputs (True rms AC Voltage, AC-Coupled Inputs)
Resolution
See Table A-3.
Table A-3. AC Voltage Measurements - Resolution
Range
Resolution
Minimum Input for Rated
Accuracy
Slow
Fast
300 mV
3V
30V
10 µV
100 µV
1 mV
100 µV
1 mV
10 mV
100 mV
20 mV
200 mV
2V
150/300V
10 mV
20V
Accuracy
See Table A-4.
Table A-4. AC Voltage Measurements - Accuracy
1 Year Accuracy ±(% ± V)
18°C to 28°C 0°C to 60°C
Range
Frequency
Slow
Fast
Slow
Fast
20 Hz - 50 Hz
1.43% + 0.25 mV 1.43% + 0.4 mV
0.30% + 0.25 mV 0.30% + 0.4 mV
0.16% + 0.25 mV 0.16% + 0.4 mV
0.37% + 0.25 mV 0.37% + 0.4 mV
1.54% + 0.25 mV
0.41% + 0.25 mV
0.27% + 0.25 mV
0.68% + 0.25 mV
3.0% + 0.30 mV
7.0% + 0.50 mV
1.53% + 2.5 mV
0.40% + 2.5 mV
0.24% + 2.5 mV
0.35% + 2.5 mV
0.9% + 3.0 mV
1.4% + 5.0 mV
1.58% + 25 mV
0.45% + 25 mV
0.30% + 25 mV
0.40% + 25 mV
1.1% + 30 mV
2.2% + 50 mV
1.57% + 0.25V
0.44% + 0.25V
0.29% + 0.25V
0.38% + 0.25V
1.0% + 0.30V
1.54% + 0.4 mV
0.41% + 0.4 mV
0.27% + 0.4 mV
0.68% + 0.4 mV
3.0% + 0.5 mV
7.0% + 1.0 mV
1.53% + 4 mV
0.40% + 4 mV
0.24% + 4 mV
0.35% + 4 mV
0.9% + 5 mV
50 Hz - 100 Hz
100 Hz - 10 kHz
10 kHz - 20 kHz
20 kHz - 50 kHz
50 kHz - 100 kHz
20 Hz - 50 Hz
300 mV
1.9% + 0.30 mV
5.0% + 0.50 mV
1.42% + 2.5 mV
0.29% + 2.5 mV
0.13% + 2.5 mV
0.22% + 2.5 mV
0.6% + 3.0 mV
1.0% + 5.0 mV
1.43% + 25 mV
0.29% + 25 mV
0.15% + 25 mV
0.22% + 25 mV
0.9% + 30 mV
2.0% + 50 mV
1.42% + 0.25V
0.29% + 0.25V
0.14% + 0.25V
0.22% + 0.25V
0.9% + 0.30V
1.9% + 0.5 mV
5.0% + 1.0 mV
1.42% + 4 mV
0.29% + 4 mV
0.13% + 4 mV
0.22% + 4 mV
0.6% + 5 mV
1.0% + 10 mV
1.43% + 40 mV
0.29% + 40 mV
0.15% + 40 mV
0.22% + 40 mV
0.9% + 50 mV
2.0% + 100 mV
1.42% + 0.4V
0.29% + 0.4V
0.14% + 0.4V
0.22% + 0.4V
0.9% + 0.5V
50 Hz - 100 Hz
100 Hz - 10 kHz
10 kHz - 20 kHz
20 kHz - 50 kHz
50 kHz - 100 kHz
20 Hz - 50 Hz
3V
1.4% + 10 mV
1.58% + 40 mV
0.45% + 40 mV
0.30% + 40 mV
0.40% + 40 mV
1.1% + 50 mV
2.2% + 100 mV
1.57% + 0.4V
0.44% + 0.4V
0.29% + 0.4V
0.38% + 0.4V
1.0% + 0.5V
50 Hz - 100 Hz
100 Hz - 10 kHz
10 kHz - 20 kHz
20 kHz - 50 kHz
50 kHz - 100 kHz
20 Hz - 50 Hz
30V
50 Hz - 100 Hz
100 Hz - 10 kHz
10 kHz - 20 kHz
20 kHz - 50 kHz
50 kHz - 100 kHz
300V
2.5% + 0.50V
2.5% + 1.0V
2.6% + 0.50V
2.6% + 1.0V
A-4
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Appendices
Specifications
A
Temperature Measurements (Thermocouples)
Accuracy
See Table A-5.
Table A-5. Temperature Measurements - Accuracy (Thermocouples) (IPTS-68)
Thermocouple
Accuracy (±°C)*
18°C to 28°C
0°C TO 60°C
1 Year 1 Year
Type
Temperature
90 Days
Slow
1 Year
Slow
1 Year
Fast
(C°)
Slow
0.54
0.57
0.88
0.64
0.62
1.47
2.01
0.73
0.68
0.74
1.75
0.56
0.64
0.82
1.28
0.83
0.59
0.66
1.07
1.37
2.26
1.49
1.87
2.48
1.38
1.64
2.02
0.87
1.09
1.49
3.00
5.00
Fast
1.08
1.01
1.37
1.30
1.15
2.22
2.95
1.60
1.39
1.31
2.53
1.08
1.02
1.24
1.81
1.72
1.13
1.06
2.71
2.67
3.78
2.96
3.34
4.24
3.81
3.03
3.49
2.10
2.04
2.58
4.66
7.60
-100 to -30
-30 to 150
0.42
0.37
0.44
0.51
0.43
0.81
1.05
0.61
0.53
0.50
1.00
0.43
0.38
0.41
0.67
0.69
0.45
0.41
0.89
0.93
1.39
1.02
1.23
1.56
1.22
1.18
1.42
0.73
0.70
0.90
1.74
2.81
0.43
0.38
0.48
0.52
0.44
0.87
1.15
0.62
0.54
0.52
1.08
0.44
0.41
0.45
0.73
0.71
0.46
0.43
0.91
0.98
1.48
1.07
1.29
1.65
1.23
1.23
1.48
0.75
0.74
0.96
1.86
3.03
0.90
0.80
0.93
1.12
0.94
1.57
2.03
1.42
1.21
1.11
1.82
0.89
0.77
0.84
1.22
1.51
0.95
0.82
2.53
2.35
2.98
2.69
2.75
3.38
3.64
2.61
2.95
1.92
1.66
2.01
3.48
5.56
J
150 to 760
-100 to -25
-25 to 120
K
120 to 1000
1000 to 1372
-100 to -25
-25 to 120
N
E
120 to 410
410 to 1300
-100 to -25
-25 to 350
350 to 650
650 to 1000
-150 to 0
T
R
S
B
0 to 120
120 to 400
250 to 400
400 to 1000
1000 to 1767
250 to 1000
1000 to 1400
1400 to 1767
600 to 1200
1200 to 1550
1550 to 1820
0 to 150
150 to 650
650 to 1000
1000 to 1800
1800 to 2316
C
*Sensor inaccuracies are not included
A-5
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2635A
Users Manual
Table A-6. Temperature Measurements - Accuracy (Thermocouples) (ITS-90)
Thermocouple
Accuracy (±°C)*
18°C to 28°C
0°C to 60°C
1 Year
Type
(°C)
Temperature
(°C)
90 Days
Slow
0.42
0.37
0.44
0.52
0.43
0.61
0.89
0.62
0.53
0.47
0.70
0.44
0.38
0.39
0.50
0.68
0.45
0.36
0.83
0.79
0.96
0.88
0.83
1.07
1.11
0.74
0.82
0.72
0.62
0.70
1.12
1.86
1 Year
Slow
0.43
0.39
0.48
0.53
0.44
0.68
0.98
0.63
0.55
0.49
0.78
0.46
0.39
0.43
0.56
0.69
0.46
0.39
0.85
0.81
1.05
0.89
0.89
1.17
1.12
0.77
0.89
0.73
0.64
0.76
1.25
2.08
1 Year
Fast
0.91
0.80
0.94
1.13
0.93
1.38
1.87
1.44
1.22
1.08
1.52
0.91
0.77
0.82
1.05
1.50
0.95
0.78
2.47
2.30
2.59
2.60
2.34
2.96
3.53
2.25
2.35
1.90
1.62
1.81
2.86
4.61
1 Year
Fast
1.08
1.02
1.38
1.31
1.16
2.03
2.79
1.61
1.39
1.28
2.23
1.09
0.98
1.23
1.63
1.71
1.13
1.02
2.66
2.53
3.42
2.80
2.94
3.84
3.69
2.57
2.90
2.08
1.94
2.38
4.04
6.66
Slow
0.55
0.57
0.88
0.65
0.62
1.28
1.85
0.75
0.67
0.69
1.45
0.57
0.61
0.80
1.11
0.82
0.59
0.61
1.02
1.15
1.85
1.26
1.47
2.03
1.27
1.18
1.43
0.86
0.99
1.29
2.38
4.06
-100 to -30
-30 to 150
J
150 to 760
-100 to -25
-25 to 120
K
120 to 1000
1000 to 1372
-100 to -25
-25 to 120
N
E
120 to 410
410 to 1300
-100 to -25
-25 to 350
350 to 650
650 to 1000
-150 to 0
T
R
S
B
0 to 120
120 to 400
250 to 400
400 to 1000
1000 to 1767
250 to 1000
1000 to 1400
1400 to 1767
600 to 1200
1200 to 1550
1550 to 1820
0 to 150
150 to 650
650 to 1000
1000 to 1800
1800 to 2316
C
* Sensor inaccuracies are not included.
A-6
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Appendices
Specifications
A
Input Impedance
100 MΩ minimum in parallel with 150 pF maximum
Common Mode and Normal Mode Rejection
See the specifications for dc voltage measurements.
Cross-Talk Rejection
Refer to Appendix B.
Open Thermocouple Detect
Small ac signal injection and detection scheme before each measurement detects greater
than 1 to 4 kΩ as open. Performed on each channel unless defeated by computer
command
Temperature Measurements (RTDs)
Accuracy
See Table A-7, A-8 and A-9.
Table A-7. Temperature Measurements - Accuracy (RTDs) (IEC751 Amendment 2) (ITS-90)
RTD
Temperature
(°C)
4-Wire Accuracy* (±°C)
18°C to 28°C
Resolution
Slow Fast
0°C to 60°C
90 Day
1 Year
Slow
1 Year
1 Year
1 Year
Fast
Slow
0.05
0.08
0.10
0.13
0.19
Fast
0.47
0.55
0.58
0.65
0.76
Slow
0.06
0.13
0.17
0.24
0.36
-200.00
0.00
0.02
0.02
0.02
0.02
0.02
0.1
0.1
0.1
0.1
0.1
0.05
0.09
0.10
0.14
0.20
0.48
0.59
0.64
0.75
0.92
100.00
300.00
600.00
* Sensor inaccuracies are not included
Table A-8. Temperature Measurements - Accuracy (RTDs) (IEC751 Amendment 1) (ITS-90)
RTD
Temperature
(°C)
4-Wire Accuracy* (±°C)
18°C to 28°C
Resolution
Slow Fast
0°C to 60°C
90 Day
1 Year
Slow
1 Year
1 Year
1
Slow
Fast
Slow
Year
Fast
-200.00
0.00
0.02
0.02
0.02
0.02
0.02
0.1
0.1
0.1
0.1
0.1
0.11
0.09
0.11
0.19
0.44
0.11
0.09
0.11
0.20
0.45
0.53
0.55
0.59
0.70
1.01
0.12
0.13
0.18
0.30
0.61
0.54
0.59
0.65
0.81
1.17
100.00
300.00
600.00
* Sensor inaccuracies are not included
A-7
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2635A
Users Manual
Table A-9. Temperature Measurements - Accuracy (RTDs) (IEC751) (IPTS-68)
4-Wire Accuracy* (±°C)
RTD
Resolution
18°C to 28°C
0°C to 60°C
Temperature
(°C)
Slow
Fast
90 Day
Slow
1 Year
Slow
1 Year
Fast
1 Year
Slow
1 Year
Fast
-200.00
0.00
0.02
0.02
0.02
0.02
0.02
0.1
0.1
0.1
0.1
0.1
0.11
0.09
0.12
0.23
0.56
0.11
0.09
0.12
0.24
0.56
0.53
0.55
0.60
0.74
1.13
0.12
0.13
0.18
0.34
0.73
0.54
0.59
0.66
0.84
1.29
100.00
300.00
600.00
* Sensor inaccuracies are not included
RTD Type
DIN/IEC 751, 100e Platinum (385)
2-wire Accuracy
For 2-wire sensors with R0 = 100Ω: degrade accuracy by 5.0ºC per lead-ohm, plus
degrade accuracy an additional 11ºC for channels 1 to 20 and 0.05ºC for channel 0.
Maximum Current Through Sensor
1 mA
Typical Full Scale Voltage
0.22 V
Maximum Open Circuit Voltage
3.2 V
Maximum Sensor Temperature
600ºC nominal
Cross-Talk Rejection
Refer to Appendix B.
AC Voltage Measurements
AC voltage measurements are true rms and use ac-coupled inputs.
A-8
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Appendices
Specifications
A
Resolution
See Table A-10.
Table A-10. AC Voltage Measurements - Resolution
Resolution Minimum Input for Rated
Range
Slow
Fast
Accuracy
20 mV
200 mV
2V
300 mV
3V
10 µV
100 µV
1 mV
100 µV
1 mV
30V
10 mV
100 mV
150/300V
10 mV
20V
Accuracy
See Table A-11.
Table A-11. AC Voltage Measurements - Accuracy
1 Year Accuracy ±(% ± V)
18°C to 28°C 0°C to 60°C
Slow Fast
Range
Frequency
Fast
Slow
20 Hz - 50 Hz
1.43% + 0.25 mV 1.43% + 0.4 mV
0.30% + 0.25 mV 0.30% + 0.4 mV
0.16% + 0.25 mV 0.16% + 0.4 mV
0.37% + 0.25 mV 0.37% + 0.4 mV
1.54% + 0.25 mV 1.54% + 0.4 mV
0.41% + 0.25 mV 0.41% + 0.4 mV
0.27% + 0.25 mV 0.27% + 0.4 mV
0.68% + 0.25 mV 0.68% + 0.4 mV
50 Hz - 100 Hz
100 Hz - 10 kHz
10 kHz - 20 kHz
20 kHz - 50 kHz
300 mV
1.9% + 0.30 mV
1.9% + 0.5 mV
5.0% + 1.0 mV
1.42% + 4 mV
0.29% + 4 mV
0.13% + 4 mV
0.22% + 4 mV
0.6% + 5 mV
1.0% + 10 mV
1.43% + 40 mV
0.29% + 40 mV
0.15% + 40 mV
0.22% + 40 mV
0.9% + 50 mV
2.0% + 100 mV
1.42% + 0.4V
0.29% + 0.4V
0.14% + 0.4V
0.22% + 0.4V
0.9% + 0.5V
3.0% + 0.30 mV
7.0% + 0.50 mV
1.53% + 2.5 mV
0.40% + 2.5 mV
0.24% + 2.5 mV
0.35% + 2.5 mV
0.9% + 3.0 mV
1.4% + 5.0 mV
1.58% + 25 mV
0.45% + 25 mV
0.30% + 25 mV
0.40% + 25 mV
1.1% + 30 mV
2.2% + 50 mV
1.57% + 0.25V
0.44% + 0.25V
0.29% + 0.25V
0.38% + 0.25V
1.0% + 0.30V
3.0% + 0.5 mV
7.0% + 1.0 mV
1.53% + 4 mV
0.40% + 4 mV
0.24% + 4 mV
0.35% + 4 mV
0.9% + 5 mV
1.4% + 10 mV
1.58% + 40 mV
0.45% + 40 mV
0.30% + 40 mV
0.40% + 40 mV
1.1% + 50 mV
2.2% + 100 mV
1.57% + 0.4V
0.44% + 0.4V
0.29% + 0.4V
0.38% + 0.4V
1.0% + 0.5V
50 kHz - 100 kHz 5.0% + 0.50 mV
20 Hz - 50 Hz
1.42% + 2.5 mV
0.29% + 2.5 mV
0.13% + 2.5 mV
0.22% + 2.5 mV
0.6% + 3.0 mV
50 Hz - 100 Hz
100 Hz - 10 kHz
10 kHz - 20 kHz
20 kHz - 50 kHz
3V
50 kHz - 100 kHz 1.0% + 5.0 mV
20 Hz - 50 Hz
1.43% + 25 mV
0.29% + 25 mV
0.15% + 25 mV
0.22% + 25 mV
0.9% + 30 mV
50 Hz - 100 Hz
100 Hz - 10 kHz
10 kHz - 20 kHz
20 kHz - 50 kHz
30V
50 kHz - 100 kHz 2.0% + 50 mV
20 Hz - 50 Hz
1.42% + 0.25V
0.29% + 0.25V
0.14% + 0.25V
0.22% + 0.25V
0.9% + 0.30V
50 Hz - 100 Hz
100 Hz - 10 kHz
10 kHz - 20 kHz
20 kHz - 50 kHz
300V
50 kHz - 100 kHz 2.5% + 0.50V
2.5% + 1.0V
2.6% + 0.50V
2.6% + 1.0V
A-9
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2635A
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Maximum Voltage Input VS. Frequency Input
See Table A-12.
Table A-12. AC Voltage Measurements
Maximum Input at Upper Frequency
300V rms
Frequency
20 Hz - 50 Hz
50 Hz - 100 Hz
100 Hz - 10kHz
10 kHz - 20 kHz
20 kHz - 50 kHz
50 kHz - 100 kHz
300V rms
200V rms
100V rms
40V rms
20V rms
Input Impedance
1 MΩ in parallel with 100 pF maximum Maximum
Maximum Crest Factor
3.0
2.0 for rated accuracy
Crest Factor Error
Non-sinusoidal input signals with crest factors between 2 and 3 and pulse widths 100 µs
and longer add 0.2% to the accuracy specifications.
Common Mode Rejection
80 dB minimum at 50 or 60 Hz ± 0.1%, 1 kΩ imbalance, slow rate
Maximum AC Input
300V rms or 424V peak on channels 0, 1, and 11
150V rms or 212V peak on channels 2 to 10 and 12 to 20
Voltage ratings between channels must not be exceeded
2 x 106 Volt-Hertz product on any range, normal mode input
1 x 10 6 Volt-Hertz product on any range, common mode input
DC Component Error
SCAN and first MONitor measurements will be incorrect if the dc signal component
exceeds 60 counts in slow rate or 10 counts in fast rate. To measure ac with a dc
component present, MONitor the input and wait 5 seconds before recording the
measurement.
Cross-Talk Rejection
Refer to Appendix B.
A-10
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Appendices
Specifications
A
Resistance Measurements
Resolution
See Table A-13.
Table A-13. Resistance Measurements - Resolution.
Range
Resolution
Typical Full
Scale Voltage
Maximum
Current
Through
Unknown
Maximum
Open Circuit
Voltage
Slow
Fast
300Ω
3 kΩ
10 mΩ
0.1Ω
1Ω
0.1Ω
1Ω
0.22V
0.25V
0.29V
0.68V
2.25V
2.72V
1 mA
110 µA
13 µA
3.2 µA
3.2 µA
3.2 µA
3.2V
1.5V
1.5V
3.2V
3.2V
3.2V
30 kΩ
300 kΩ
3 MΩ
10 Ω
100 Ω
1 kΩ
10 kΩ
10 Ω
100 Ω
1 kΩ
10 MΩ
Accuracy
See Table A-14.
Table A-14. Resistance Measurements - Accuracy (Four-Wire)
4-Wire Accuracy ±(%±Ω)
18°C to 28°C
1 Year, Slow
Range
0°C to 60°C
90 Days, Slow
1 Year, Fast
1 Year, Slow
1 Year, Fast
300Ω
3 kΩ
0.013% + 20 mΩ
0.015% + 0.2Ω
0.013% + 2Ω
0.014% + 20 mΩ
0.016% + 0.2Ω
0.014% + 2Ω
0.014% + 0.2Ω
0.016% + 2Ω
0.031% + 20 mΩ
0.039% + 0.2Ω
0.039% + 2Ω
0.031% + 0.2Ω
0.039% + 2Ω
30 kΩ
300 kΩ
3 MΩ
10 MΩ
0.014% + 20Ω
0.021% + 200Ω
0.063% + 2 kΩ
0.039% + 20Ω
0.050% + 200Ω
0.231% + 2 kΩ
0.923% + 20 kΩ
0.020% + 20Ω
0.059% + 200Ω
0.168% + 2 kΩ
0.021% + 20Ω
0.063% + 200Ω
0.169% + 2 kΩ
0.050% + 20Ω
0.231% + 200Ω
0.709% + 20 kΩ 0.573% + 2 kΩ
A-11
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2635A
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2-Wire Accuracy
Add 4.0Ω to accuracy specifications for channels 1 to 20, and add 20 mΩ for channel 0.
Lead wire resistances are not included.
300V dc or ac rms on all ranges
Cross-Talk Rejection
Refer to Appendix B.
Frequency Measurements
Resolution and Accuracy
See Table A-15.
Table A-15. Frequency Measurements-Resolution and Accuracy
Resolution Accuracy + (% ± Hz)
Range
Slow
Fast
Slow
Fast
15 Hz - 900 Hz
9 kHz
0.01 Hz
0.1 Hz
1 Hz
0.1 Hz
1 Hz
0.05% + 0.02 Hz
0.05% + 0.1 Hz
0.05% + 1 Hz
0.05% + 0.2 Hz
0.05% + 1 Hz
90 kHz
10 Hz
100 Hz
1 kHz
0.05% + 10 Hz
0.05% + 100 Hz
0.05% + 1 kHz
900 kHz
1 MHz
10 Hz
100 Hz
0.05% + 10 Hz
0.05% + 100 Hz
Frequency Range
15 Hz to greater than 1 MHz
Input Sensitivity
See Table A-16.
Table A-16. Frequency Measurements - Input Sensitivity
Frequency Level (sine wave)
15 Hz - 100 kHz
100 mV rms
150 mV rms
2V rms
100 kHz - 300 kHz
300 kHz - 1 MHz -
Above 1 MHz
Not specified
A-12
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Appendices
Specifications
A
Maximum AC Input
300V rms or 424V peak on channels 0, 1, and 11
150V rms or 212V peak on channels 2 to 10 and 12 to 20
Voltage ratings between channels must not be exceeded
2 x 106 Volt-Hertz product on any range, normal mode input
1 x 106 Volt-Hertz product on any range, common mode input
Cross-Talk Rejection
Refer to Appendix B.
Typical Scanning Rate
See table below. The measurement conditions are: averaged rate over 20 scans;
continuous scanning; alarm limits and Mx+B scanning set on all channels; logging data
to internal memory; and RS-232 communications set at 9600 baud. Measurements were
taken with short-circuit inputs on all channels, except frequency, which was taken with
5V at 15 Hz on all channels.
Table A-17. Typical Scanning Rate
CHANNELS
FUNCTION
RANGE
SLOW
10
FAST
10
1
20
1
20
VDC
300 mV
3V
1.8
1.8
1.8
1.8
1.7
1.0
1.7
1.1
1.1
1.1
1.1
1.1
1.7
1.7
1.7
1.2
1.2
1.1
1.7
0.5
3.9
3.9
3.9
3.9
3.6
3.3
3.1
1.5
1.5
1.5
1.5
1.5
3.1
3.1
3.1
1.8
1.6
1.6
3.1
0.6
4.1
4.1
4.1
4.1
3.9
3.8
3.2
1.6
1.6
1.6
1.6
1.5
3.2
3.2
3.2
1.8
1.7
1.6
3.2
0.6
2.5
2.5
2.5
2.5
2.4
2.1
2.1
1.3
1.3
1.3
1.3
1.3
2.1
2.1
2.1
1.7
1.7
1.7
2.1
0.6
13.7
13.7
13.7
13.6
11.3
12.2
6.0
18.4
18.4
18.3
18.2
14.1
16.6
6.7
30V
150/300V
AUTO
J (TC)
PT (RTD)
300 mV
3V
TEMPERATURE
VAC
2.5
2.6
2.5
2.6
30V
2.5
2.6
150/300V
AUTO
300Ω
2.5
2.6
2.4
2.5
OHMS
6.0
6.7
3 kΩ
6.0
6.7
30 kΩ
300 kΩ
3 MΩ
6.0
6.7
4.0
4.4
3.9
4.2
10 MΩ
AUTO
ANY
3.8
4.0
6.0
6.7
FREQUENCY
0.7
0.7
A-13
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2635A
Users Manual
Maximum Autoranging Time
See Table A-18 (shown in seconds per channel).
Totalizing Input
Input Voltage
30V maximum
4V minimum
2V peak minimum signal
Isolation
None
dc-coupled
Table A-18. Autoranging Rates
Function
Range Change
Slow
Fast
VDC
300 mV
150V
---------------------------->
---------------------------->
---------------------------->
---------------------------->
---------------------------->
---------------------------->
150 V
300 mV
150V
0.25
0.25
1.40
1.40
1.70
1.50
0.19
0.18
1.10
1.10
0.75
0.60
VAC
300 mV
150 mV
300 Ω
300 mV
10.0 MΩ
300 Ω
Ohms
10.0 MΩ
Threshold
1.4V
Hysteresis
500 mV
Input Debouncing
None or 1.75 ms
Rate
0 to 5 kHz with debouncing off
Maximum Count
65,535
Digital Inputs
The specifications for the digital inputs are provided in the following paragraphs.
A-14
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Appendices
Specifications
A
Input Voltage
30V maximum
-4V minimum
Isolation
none
dc-coupled
Threshold
1.4V
Hysteresis
500 mV
Trigger Inputs
Input Voltages
contact closure and TTL compatible
“high” =2.0V min, 7.0V max
“low” = -0.6V min, 0.8V max
Isolation
None
dc-coupled
Minimum Pulse Width
5 µs
Maximum Frequency
5 Hz
Specified Conditions
The instrument must be in the quiescent state, with no interval scans in process, no
commands in the queue, no RS-232 activity, and no front panel activity if the latency and
repeatability performance is to be achieved.
Maximum Latency
Latency is measured from the edge of the trigger input to the start of the first channel
measurement for the Specified Conditions (above).
540 ms for fast rate, scanning DCV, ACV, ohms, and frequency only
610 ms for fast rate, scanning any thermocouple or 100 mV dc channels
500 ms for slow rate, scanning DCV, ACV, ohms, and frequency only
950 ms for slow rate, scanning any thermocouple or 100 mV dc channels
Repeatability
3 ms for the Specified Conditions (above)
A-15
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2635A
Users Manual
Digital and Alarm Outputs
The specifications for the digital and alarm outputs are provided in the following
paragraphs.
Output Logic Levels
Logical “zero”:
Logical “one”:
0.8V max for an Iout of -1.0 mA (1LSTTL load)
3.8V min for an Iout of 0.05 mA (1LSTTL load)
For non-TTL loads: 1.8V max for an Iout or -20 mA
Logical “zero”: 3.25 max for an Iout of -50 mA
Isolation
none
Real-Time Clock and Calendar
The specifications for the real-time clock and calendar are provided in the following
paragraphs.
Accuracy
Within 1 minute per month for 0°C to 50°C range
Battery Life
>10 unpowered instrument years for 0°C to 28°C
>3 unpowered instrument years for 0°C to 50°C
>2 unpowered instrument years for 50°C to 70°C
Environmental Specifications
The environmental specifications are provided in the following paragraphs.
Warmup Time
1 hour to rated specifications
15 minutes when relative humidity is kept below the rated maximum minus 20% (e.g.
below 70% for a 90% maximum rating).
Operating Temperature
0°C to 60°C
Storage Temperature
-40°C to +75°C
Instrument storage at temperature extremes may necessitate adding up to 0.008% to the
dc and ac voltage accuracy specifications. Alternatively, any resulting shift can be
compensated for by recalibrating the instrument.
A-16
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Appendices
Specifications
A
Relative Humidity (Non-Condensing)
90% maximum for 0°C to 28°C
75% maximum for 28°C to 35°C
50% maximum for 35°C to 50°C
35% maximum for 50°C to 60°C
(Except 70% maximum for 0°C to 35°C, 0% maximum for 40°C to 50°C, and 20%
maximum for 50°C to 60°C for the 300 ke, 3 Me, and 10 Me ranges.)
Altitude
Operating: 2,000 m maximum
Non-operating: 12,200m maximum
Vibration
0.7g at 15 Hz
1.3g at 25 Hz
3g at 55 Hz
Shock
30g half sine per Mil-T-28800
Bench handling per Mil-T-28800
General
The general specifications are provided in the following paragraphs.
Channel Capacity
21 Analog Inputs
4 Alarm Outputs
8 Digital I/O (inputs/outputs)
Measurement Speed
Slow rate: 4 readings/second nominal
Fast rate: 17 readings/second nominal
1.5 readings/second nominal for ACV and high-e inputs
For additional information, refer to Typical Scanning Rated and Maximum Autoranging
Time.
Nonvolatile Memory Life
>10 unpowered instrument years for 0°C to 28°C
>3 unpowered instrument years for 0°C to 50°C
>2 unpowered instrument years for 50°C to 70°C
Stores: Real-time clock, set-up configuration, and measurement data.
Common Mode Voltage
300V dc or ac rms maximum from any analog input (channel) to earth provided that
channel to channel maximum voltage ratings are observed.
A-17
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2635A
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Voltage Ratings
Channels 0,1, and 11 are rated at 300V dc or ac rms maximum from a channel terminal
to earth and from a channel terminal to any other channel terminal.
Channels 2 to 10 and 12 to 20 are rated at 150V dc or ac rms maximum from a channel
terminal to any other channel terminal within channels 2 to 10 and 12 to 20.
IEC Overvoltage Category II.
Size
9.3 cm high, 21.6 cm wide, 31.2 cm deep
Weight
Net, 2.95 kg
Shipping, 4.0 kg
Power
90V to 264V ac (no switching required), 50 and 60 Hz, 10 VA maximum
9V dc to 16V dc, 10W maximum
If both sources are applied simultaneously, ac is used if it exceeds approximately 8.3
times dc.
Automatic switchover occurs between ac and dc without interruption.
(At 120V ac the equivalent dc voltage is ~14.5V).
Standards
IEC 1010-1, ANSI/ISA S82.01-1994, CSA-C22.2 No.1010.1-92, and EN61010-1:1993.
Complies with EN 50081-1, EN 50082-1, Vfg. 243/1991 and FCC-15B at the Class B
level, when shielded cables are used.
RS-232-C
Connector:
Signals:
9 pin male (DB-9P)
TX, RX, DTR, DSR, RTS, CTS, GND
Modem Control: full duplex
Baud rates:
300, 600, 1200, 2400, 4800, 9600, 19200, 38400
Data format:
8 data bits, no parity bit, one stop bit, or 7 data bits, one parity bit
(odd or even), one stop bit
Flow control:
Echo:
CTS (Hardware) and XON/XOFF (Software)
on/off
A-18
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Appendix B
Crosstalk Considerations
Introduction
This appendix augments the discussion of ac signal effects on other channels (crosstalk).
Effects on each measurement function are discussed below. These numbers should only
be considered as references. Since cross talk can be introduced into a measurement
system in many places, each setup must be considered individually.
The effect of cross talk could be much better than shown for "Typical"; in extreme cases,
the effect could be worse than the "Worst Case" numbers. In general, the "Worst Case"
information assumes that none of the guidelines for minimizing cross talk (Chapter 1)
have been followed; the "Typical" information assumes that the guidelines have been
followed where reasonable.
These numbers assume that input L (low) is tied to earth ground; refer to "Using
Shielded Wiring" in Chapter 1. For dc volts and thermocouple temperature
measurements, a source impedance of 1 ke in series with the H (high) input is assumed
(except where otherwise noted.)
AC Signal Cross Talk in a DC Voltage Channel
VDC(error)
DCV Error Ratio (CTRR) =
VACrms
Worst case
Typical
50, 60 Hz, ±0.1%:
Other Frequencies:
1.1 × 10-7
3.8 × 10-6
2.0 × 10-8
8.6 × 10-7
For example, the typical effect on a channel measuring dc volts (300 mV range) by a 300
V ac signal at 60 Hz on another channel would be: 300 × 2.0 × 10-8 = 0.01 mV.
B-1
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2635A
Users Manual
AC Signal Cross Talk into an AC Voltage Channel
VACrms(error)
ACV Error Ratio =
VACrms(crosstalk) × Frequency(crosstalk)
Range
Ratio (worst case)
Ratio (typical)
v
v
300.00 m
4.8 × 10-8
1.4 × 10-8
3.0 × 10-8
2.6 × 10-7
3.4 × 10-6
v × Hz
v × Hz
v
v
3.0000 V
1.1 × 10-7
v × Hz
v × Hz
v
v
30.000 V
1.2 × 10-6
v × Hz
v × Hz
v
v
150.00/300.00
1.2 × 10-5
v × Hz
v × Hz
For example, the typical effect on a channel measuring ac volts (300 mV range) by a
220V ac signal at 60 Hz on another channel would be: 220 X 60 X 1.4 X 10-8 = 0.18 mV.
AC Signal Cross Talk into an Ohms Channel
AC Frequency = 50, 60 Hz, ±0.1%
Ohms(error)
OHMS Error Ratio1 =
VACrms(crosstalk)
Range
Ratio (worst case)
Ratio (typical)
Ohms
300.00 e 3.3 × 10-5
3.0000 ke
NoEffect
Vrms
kOhms
Vrms
kOhms
2.4 × 10-6
3.1 × 10-4
5.6 × 10-3
3.8 × 10-4
6.7 × 10-7
8.4 × 10-5
3.7 × 10-3
3.8 × 10-5
Vrms
kOhms
Vrms
kOhms
Vrms
30.000ke
kOhms
Vrms
kOhms
Vrms
300.00 ke
MOhms
Vrms
MOhms
Vrms
3.0000 Me
B-2
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Appendices
Crosstalk Considerations
B
MOhms
Vrms
MOhms
10.000 Me
1.4 × 10-3
4.3 × 10-4
Vrms
For example, to find the typical effect of a 60 Hz, 100V ac signal on another channel for
the 30 kΩ range, you would calculate: 100 X 8.4 X 10-5 = 0.008 kΩ.
1These values assume no more than 1000 pf of capacitance between either end of the resistor (HI and LOW ) and
earth ground.
AC Signal Cross Talk into a Frequency Channel
Frequency measurements are unaffected by cross talk as long as the voltage-frequency
product is kept below the following limits:
Worst Case
Typical
V x Hz Product Limit
3.7 × 104 (V × Hz)
1.0 × 106 (V × Hz)
AC Signal Crosstalk into a Temperature Channel
Frequency = 50, 60 Hz
°C(error)
TEMPERATURE Error Ratio =
VACrms(crosstalk)
Worst case
Typical
°C
Vrms
°C
Vrms
Types J, K, E, T, N:
Types R, S, B, C:
Type PT (RTD):
2.7 × 10-3
5.0 × 10-4
°C
Vrms
°C
Vrms
1.1 × 10-2
8.6 × 10-5
2.0 × 10-3
°C
Vrms
No Effect
B-3
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2635A
Users Manual
B-4
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Appendix C
Binary Upload of Logged Data
Introduction
The LOG_BIN? <index> query can be used to quickly upload logged data from a 2635A.
The response is a single ASCII string, which encodes the raw binary data stored at the
specified <index> position. The logged data is also retained in the 2635A.
The measurement data returned from the 2635A is in the (binary) IEEE single-precision
floating point format. Making use of this data can be difficult and is very machine
dependent. A working example, using the C programming language on an IBM PC, is
provided in this appendix. This example uses a pre-computed LOG_BIN?response
string, and checks that the conversion process works as expected.
Two steps are required in adapting the LOG_BIN? response string for use with your
computer.
•
First, you must decode the ASCII string into binary data.
For example, one possible LOG_BIN? response string is:
LOG_BIN? 1
42@Y40BA00oo000007o0001oP000?h000
=>
This ASCII string represents the following binary (hex) data:
10 24 29 10 04 91 00 0f ff
00 00 00 00 7f c0 00 00 7f
80 00 00 3f 80 00 00 00 00
•
Second, you must convert this binary data into valid floating point numbers for your
underlying computer architecture.
Decoding the ASCII String
The ASCII response string contains six bits of raw data for each ASCII character, offset
from ASCII ’0’(0x30 hex, 48 decimal). Therefore, the conversion process subtracts 48
from the integer value of each character, then shifts it into place. Each set of four ASCII
characters form three bytes of raw data. The number of bytes of raw data depends on the
C-1
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2635A
Users Manual
number of channels for the scan. The following C code converts a LOG_BIN? response
string into a byte array:
/*
-* decode(): Decode LOG_BIN? response string into raw byte stream
**
** Decoding is done on multiples of four input bytes:
**
**
543210
543210
543210
543210
(bit number in ASCII bytes)
**
+--------+--------+--------+--------+
| src[0] | src[1] | src[2] | src[3] |
+--------+--------+--------+--------+
**
ASCII string input
**
**
765432
/
107654
321076
543210
(bit number in raw bytes)
**
/
/
/
**
/
/
**
|
|
|
|
|
/
/
/
**
/
**
|
|
|
/
**
/
**
|
**
76543210 76543210 76543210
+--------+--------+--------+
| dst[0] | dst[1] | dst[2] |
+--------+--------+--------+
(bit number in raw bytes)
Raw data output
**
**
**
**
** Inputs:
**
**
**
**
**
**
**
dst
Destination for binary data (must have enough space
allocated; the maximum needed is 6 timestamp bytes + 3
bytes for temp units, measurement rate, and digital I/O
+ 4 bytes/float * 22 floating point values = 97 bytes).
src
Source ASCII string (null terminated)
** Outputs:
**
**
dst
Set to binary data, based on ASCII string
** Returns:
**
*/
Number of bytes placed in destination buffer
int
decode(dst, src)
unsigned char *dst;
char *src;
{
/* src to dst xlate */
static struct nibtab_s {
int lindex;
int lmask;
int lshift;
int rindex;
int rmask;
int rshift;
} nibtab[3] = {
/* left
right */
C-2
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Appendices C
0, 0x3f, 2,
1, 0x0f, 4,
2, 0x03, 6,
1, 0x30, 4,
2, 0x3c, 2,
3, 0x3f, 0,
/* dst[0] from src[0] and src[1] */
/* dst[1] from src[1] and src[2] */
/* dst[2] from src[2] and src[3] */
};
auto unsigned char n;
auto struct nibtab_s *t;
auto unsigned char tmpsrc[4];
auto int dst_bytes;
/* Number of bytes created */
dst_bytes = 0;
/* Process src in chunks of four */
while (*src) {
/* Copy source, filing "holes" at end with zeros */
for (n = 0; n < 4; n++) {
if (*src)
tmpsrc[n] = *src++ - ’0’;
else
tmpsrc[n] = 0;
}
/* Mung source into destination */
for (t = nibtab; t < &nibtab[3]; t++) {
*dst = (tmpsrc[t->lindex] & t->lmask) << t->lshift;
*dst |= (tmpsrc[t->rindex] & t->rmask) >> t->rshift;
dst++;
dst_bytes++;
}
}
return (dst_bytes);
Figure C-1. ASCII String Decoding
}
The raw data output array contains the information listed below. Note that the number of
floating point values is equal to the number of channels in use, plus one. (The totalizer
count is always present in the data, and is stored as a floating point number.)
•
Time stamp (BCD format)
byte0: hours
byte1: minutes
byte2: seconds
byte3: month
byte4: date
byte5: year
•
Temperature units, measurement rate, and I/O
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byte6: temperature units and rate (0x10 bit means degrees Fahrenheit, else
Centigrade; 0x01 bit means fast rate, else slow rate)
byte7: Alarm outputs
byte8: Digital I/O
•
•
Totalizer value as 32-bit single-precision IEEE floating point number stored using
the byte ordering shown below. The format of this number is explained under
"Floating Point Conversion".
byte 9: MMSB of float
byte 10: MLSB of float
byte 11: LMSB of float
byte 12: LLSB of float
Measurement data; only defined channels are included (exactly like LOG?query);
same floating point format, but with a wider range of values. NaN (Not a Number)
is used to indicate open thermocouple, and plus or minus Inf (infinity) to indicate
overload. The bit values for NaN and Inf are explained in the next section.
byte 13: MMSB of float
byte 14: MLSB of float
byte 15: LMSB of float
byte 16: LLSB of float
bytes 17-20: Second measurement result, if any
bytes 21-24: Third measurement result, if any
...
Since the ASCII decoding (explained above) creates data multiples of three in length, it
is possible that there will be one or two unused bytes at the end of the decoded byte
stream.
Floating Point Conversion
ANSI/IEEE Std 754-1985, "IEEE Standard for Binary Floating-Point Arithmetic,"
describes the single-precision floating point format used to return measurement data.
This standard defines the format for single-precision floating point as:
X = (-1) s 2 (e-127) (1.m )
where
s = sign
e = exponent
m = mantissa
The floating point format used is 32-bit with a 1-bit sign, 8-bit exponent, and 24-bit
mantissa with the most significant bit hidden under the LSB of the exponent. The
number is formatted as shown in Table C-1.
For all other measurement queries, Hydra Series II returns the string "+9E+9" for open
thermocouple (OTC) measurement values. However, for the LOG_BIN?query, NaN (not
a number) is returned instead. The IEEE floating point standard defines NaN as a
positive, maximum exponent number with non-zero mantissa bits. Hydra Series II sets
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Appendices C
just the most significant mantissa bit, so the raw binary byte stream value is 7f c0 00 00
(hex).
For all other measurement queries, Hydra Series II usually returns ±1e9 for overload
(OL) measurement values. However, for the LOG_BIN? query, Hydra Series II returns
Inf (infinity) instead. The IEEE floating point standard defines Inf as a positive or
negative maximum exponent number with a zero mantissa. Hydra Series II returns +Inf
as the byte stream 7f 80 00 00 (hex) and -Inf as ff 80 00 00 (hex).
Table C-1. Floating-Point Format
Sign
1 bit
Exponent
8 bits
Manitssa
23 bits (plus one hidden bit)
high byte
(MMSB)
High-mid byte
(MLSB)
low-mid bute
(LMSB)
low byte
(LLSB)
The C code in Figure C-2 converts raw data into a useful format for the Intel x86 (IBM
PC) architecture. The BCD time stamp is converted to integers, and floating point
numbers created for the totalizer and measurement values.
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/* Import globals from main program */
extern int timestamp[];
extern int misc[];
extern float values[];
/*
-* convert(): Convert a LOG_BIN? array of binary data into useful data
**
** Converts BCD values to integer, raw floating point values into float
** values usable under the Intel x86 (IBM PC) architecture.
**
** Inputs:
**
**
**
src
length
Array of binary data, from LOG_BIN? query
Number of bytes in src array
** Outputs:
**
**
**
**
*/
timestamp[]
Set to decimal timestamp values
misc[]
Set to temp units, rate, and digital I/O values
Set to floating point values found in binary data
(must be room for a maximum of 22 floats)
values[]
void
convert(src, length)
unsigned char *src;
int length;
{
unsigned char *m;
int n;
/* Convert timestamp from BCD to decimal */
for (n=0; n < 6; n++, src++) {
/* Binary Coded Decimal (BCD) format, packs the upper nibble as the
*/
*/
*/
/* tens digit, the lower nibble as the ones digit. Convert this
/* into an integer number.
timestamp[n] = (10 * (*src >> 4) + (*src & 0x0f));
}
/* Save temperature units, measurement rate, and digital I/O values */
for (n=0; n < 3; n++) {
misc[n] = *src++;
}
/* Convert raw measurement data into floating point */
m = (unsigned char *)values;
for (length -= 9; length > 3; length -= 4) {
#ifdef sun
/* SunOS architecture (also works for Motorola CPUs) */
*m++ = src[0];
*m++ = src[1];
*m++ = src[2];
*m++ = src[3];
#else
/* Assume Intel x86 architecture */
*m++ = src[3];
*m++ = src[2];
*m++ = src[1];
*m++ = src[0];
#endif
src += 4;
}
}
Figure C-2. Floating_Point Conversion
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Appendices C
Example
Figure C-3 is a short example that uses the routines in Figures C-1 and C-2 to decode a
fixed (pre-computed) LOG_BIN? response string.
When compiled and run on an Intel architecture computer, the program should print
"Conversion worked".
Although this example is useful for educational purposes, it is not very efficient. If
desired, the decoding and conversion processes can be combined into a single, fast
algorithm.
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/* Globals convert() uses for destination */
int timestamp[6];
int misc[3];
float values[22];
/* Scan timestamp */
/* Temperature units, measurement rate, digital I/O */
/* Measurement values */
extern int isnan();
extern int isinf();
/* Floating point value is NaN (not a number) */
/* Floating point value is Inf (infinity) */
/*
-* main(): LOG_BIN? query response example program
**
** Converts a hard-coded LOG_BIN? response string into usable data.
*/
main()
{
extern int decode();
/* ASCII to binary decoding */
/* Convert Hydra binary to usable types */
extern void convert();
/* Canned response for three channels: channel 1 is OTC, channel 5 is */
/* OL and channel 10 is 1.0; remaining encoded data described below
/* (note that you can not determine the channel number, measurement
*/
*/
/* units, or measurement range, from this string; you must keep track */
/* of that elsewhere)
char *log_bin_response = "42@Y40BA00oo000007o0001oP000?h000";
*/
/* Place to temporarily store raw data; 100 bytes is more than enough */
/* for any LOG_BIN? response string
unsigned char raw_data[100];
*/
/* Decode string into raw data, then convert raw data into usable data */
convert(raw_data, decode(raw_data, log_bin_response));
/* Above global variables now usable; check example LOG_BIN? data */
/* against expected values
*/
if ((timestamp[0] == 10) &&
(timestamp[1] == 24) &&
(timestamp[2] == 29) &&
(timestamp[3] == 10) &&
(timestamp[4] == 4) &&
(timestamp[5] == 91) &&
/* Hours
/* Minutes
/* Seconds
/* Month
/* Day
*/
*/
*/
*/
*/
*/
/* Year
(misc[0]
(misc[1]
(misc[2]
(values[0]
== 0) &&
/* Temp units and rate */
== 15) &&
== 255) &&
== 0.0) &&
/* Alarm outputs
/* Digital I/O
*/
*/
*/
*/
*/
*/
/* Totalizer
isnan(values[1]) &&
isinf(values[2]) &&
/* Channel 1 data
/* Channel 5 data
/* Channel 10 data
(values[3]
== 1.0)) {
printf("Conversion worked\n");
}
else {
printf("ERROR: conversion did not succeed!\n");
}
exit(0);
}
/* If your math library supplies alternatives to isnan() or isinf(), */
/* use them instead!
*/
int
isnan(f)
float f;
{
/* This is not portable, or completely accurate (since NaN mantissa
*/
/* must only be non-zero, and the sign bit can be set), but this works */
/* for NaN values returned by Hydra
*/
/* Compiler was free to promote to double */
float ff = f;
return ((*(unsigned long *)&ff) == 0x7fc00000L);
}
int
isinf(f)
float f;
{
/* Again, this is not portable, but this time it is accurate */
/* Compiler was free to promote to double */
float ff = f;
return ((*(unsigned long *)&ff) == 0x7f800000L) ||
((*(unsigned long *)&ff) == 0xff800000L);
}
Figure C-3. Example
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Appendix D
RS-232 Cabling
Introduction
This appendix details the RS-232 cabling between the instrument and a PC, instrument
controller (Fluke 17XXA series), printer, or modem. All connections can be made using
the Fluke RS-series of cables (see Options and Accessories in Chapter 1). RS-232 cables
should not exceed 50 feet (15 meters) although longer cables are permitted if the load
capacitance measured at a connection point (including signal terminator) does not
exceed 2500 picofarads. The Fluke RS cables are 6 feet (1.83 meters) in length.
Connections
Figure D-1 summarizes the cable requirements for all typical RS-232 connections;
Figure D-2 through E-6 summarize instrument cabling diagrams; Figure D-7 shows the
pin arrangement for DB-9 and DB-25 connectors. There are two wiring schemes
(modem and null-modem), two types of connectors (DB-9 and DB-25), two cable end
conditions (male and female), and two equipment configurations (Data Terminal
Equipment [DTE] and Data Communications Equipment [DCE]). Because of variations
in RS-232 connectors, it is not possible to identify all possible configurations. In this
application, “null-modem” refers to a reversing of the following lines; receive (RX) and
transmit (TX), data terminal ready (DTR) and data set ready (DSR), and request to send
(RTS) and clear to send (CTS). Not all interfaces use all lines. Check the documentation
for the equipment you are interfacing with the instrument.
Cables
The Fluke RS-series of RS-232 cables are in the following standard configurations:
•
•
•
RS40 - Null modem with DB-9/female and DB-25/female connectors
RS41 - Modem with DB-9/female and DB-25/male connectors
RS42 - Null modem with DB-9/female and DB-25/male connectors
Cables from other sources may be used, or cables can be fabricated based on the figures
in this appendix. The RS40 and RS42 cables are identical, except for the DB-25
connectors (female and male, respectively). Some interfaces allow a selection of cables.
D-1
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For example, connection to a serial-to-parallel converter (when using a printer with a
parallel input) may be as a DTE (cable RS42) or DCE (cable RS40).
GENERIC
(NULL MODEM)
PC
(DTE)
HYDRA
(DTE)
RS43
(DB-9/MALE)
(DB-9/MALE)
PC
(DTE)
HYDRA
(DTE)
RS40
(DB-25/MALE)
(DB-9/MALE)
MODEM
(DCE)
(DB-25/FEMALE)
HYDRA
(DTE)
(DB-9/MALE)
RS41
(MODEM)
PRINTER
(DTE)
(DB-25/FEMALE)
HYDRA
(DTE)
(DB-9/MALE)
RS42
RS42
SERIAL-TO-PARALLEL
(DTE)
HYDRA
(DTE)
PRINTER
PRINTER
(DB-25/FEMALE)
(DB-9/MALE)
SERIAL-TO-PARALLEL
(DCE)
(DB-25/FEMALE)
HYDRA
(DTE)
(DB-9/MALE)
RS41
(MODEM)
KEY
DTE – DATA TERMINAL EQUIPMENT
DCE – DATA COMMUNICATIONS EQUIPMENT
– MALE
– FEMALE
op71f.eps
Figure D-1. Summary of RS-232 Connections
D-2
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RS-232 Cabling
Appendices D
RS43 CABLE
(NULL MODEM)
HYDRA
PC
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
DCD
Rx
Rx
Tx
Tx
DTR
GND
DSR
RTS
CTS
DTR
GND
DSR
RTS
CTS
RI
RS-232C
DB-9
DB-9
COM
KEY
PINS
DCD – DATA CARRIER DETECT
Rx – RECEIVE
FEMALE
MALE
Tx – TRANSMIT
DTR – DATA TERMINAL READY
GND – GROUND
DSR – DATA SET READY
RTS – REQUEST TO SEND
CTS – CLEAR TO SEND
RI – RING INDICATOR
op73f.eps
Figure D-2. Hydra Series II (DB-9) to PC (DB-9) RS-232 Connection (Generic)
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RS40 CABLE
(OR EQUAL)
PC
1
2
Tx
3
Rx
4
RTS
CTS
DSR
GND
DCD
5
6
7
HYDRA
8
1
2
3
4
5
6
7
8
9
9
Rx
Tx
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
DTR
GND
DSR
RTS
CTS
RS-232C
DB-9
DTR
RI
KEY
PINS
FEMALE
Tx – TRANSMIT
Rx – RECEIVE
MALE
RTS – REQUEST TO SEND
CTS – CLEAR TO SEND
DSR – DATA SET READY
GND – GROUND
DCD – DATA CARRIER DETECT
DTR – DATA TERMINAL READY
RI – RING INDICATOR
DB-25
COM
op74f.eps
Figure D-3. Hydra (DB-9) to PC (DB-25) RS-232 Connection
D-4
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RS-232 Cabling
Appendices D
RS41 CABLE
(OR EQUAL)
MODEM
1
2
Tx
3
Rx
4
RTS
CTS
DSR
GND
DCD
5
6
7
HYDRA
8
1
2
3
4
5
6
7
8
9
9
Rx
Tx
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
DTR
GND
DSR
RTS
CTS
RS-232C
DB-9
DTR
RI
KEY
PINS
FEMALE
Tx – TRANSMIT
Rx – RECEIVE
MALE
RTS – REQUEST TO SEND
CTS – CLEAR TO SEND
DSR – DATA SET READY
GND – GROUND
DB-25
DCD – DATA CARRIER DETECT
DTR – DATA TERMINAL READY
RI – RING INDICATOR
op75f.eps
Figure D-4. Hydra Series II (DB-9 to Modem (DB-25) RS-232 Connection
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RS42 CABLE
(OR EQUAL)
PRINTER
1
2
Tx
Rx
3
4
RTS
5
CTS
DSR
GND
DCD
6
7
HYDRA
8
1
2
3
4
5
6
7
8
9
9
Rx
Tx
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
DTR
GND
DSR
RTS
CTS
RS-232C
DB-9
DTR
RI
KEY
PINS
FEMALE
Tx – TRANSMIT
Rx – RECEIVE
MALE
RTS – REQUEST TO SEND
CTS – CLEAR TO SEND
DSR – DATA SET READY
GND – GROUND
DB-25
DCD – DATA CARRIER DETECT
DTR – DATA TERMINAL READY
RI – RING INDICATOR
op76f.eps
Figure D-5. Hydra Series II (DB-9) to Printer (DB-25) RS-232 Connection
D-6
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RS-232 Cabling
Appendices D
6
7
8
9
6
5
SOLDER
SIDE
CONNECTOR
SIDE
1
2
3
4
5
MALE
FEMALE
9
8
7
CONNECTOR
SIDE
SOLDER
SIDE
5
4
3
2
1
DB-9
CONNECTOR
13 12 11 10
9
8
7
6
4
3
2
1
SOLDER
SIDE
CONNECTOR
SIDE
25 24 23 22 21 20 19 18 17 16 15 14
MALE
FEMALE
1
2
3
4
5
6
7
8
9
10 11
13
12
CONNECTOR
SIDE
SOLDER
SIDE
14 15 16 17 18 19 20 21 22 23 24 25
DB-25
CONNECTOR
op77f.eps
Figure D-6. RS-232 DB-9 and DB-25 Connectors
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Table E-1. 8-Bit Binary-Coded-Decimal
Binary
Binary
Binary
Binary
7
6
5
4
3
2
1
0
Dec
7
6
5
4
3
2
1
0
Dec
7
6
5
4
3
2
1
0
Dec
7
6
5
4
3
2
1
0
Dec
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
000
001
002
003
004
005
006
007
008
009
010
011
012
013
014
015
016
017
018
019
020
021
022
023
024
025
026
027
028
029
030
031
032
033
034
035
036
037
038
039
040
041
042
043
044
045
046
047
048
049
050
051
052
053
054
055
056
057
058
059
060
061
062
063
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
064
065
066
067
068
069
070
071
072
073
074
075
076
077
078
079
080
081
082
083
084
085
086
087
088
089
090
091
092
093
094
095
096
097
098
099
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
160
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
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215
216
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220
221
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223
224
225
226
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228
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231
232
233
234
235
236
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241
242
243
244
245
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250
251
252
253
254
255
E-2
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Appendix F
Memory Card File Formats
Introduction
This appendix contains a description of the format of the binary files created by the
2635A Data Bucket. This information is intended to describe the contents in enough
detail to allow someone well versed in a software programming language to use this
information to write software to read and interpret the Data Bucket scan data files. (This
example ;uses the ANSI C Language to examples of decoding and interpreting the file
data. This code can be compiled using the Microsoft C Compiler on an MS-DOS PC or
compatible.)
Data File Format
The data file format consists of two parts: a header, including the Data Bucket
configuration during the time the data was gathered: followed by any scan data collected.
Setup File Format
The setup file format is very similar to the data file format. The only differences are the
byte at offset zero has a value of 0 instead of 1, and there is never any scan data (the file
always ends at offset 729).
The details of the Hydra Data Bucket binary file configuration format are as follows. A
good familiarity with the operation of the Hydra Data Bucket will be necessary to
understand much of the configuration information. For the most part, however, it is not
necessary to understand all of the configuration information to be able to successfully
manipulate the scan data. The references are to compute interface commands in Chapter
4.
F-1
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2635A
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Offset Description
=====
0
===========
File type; 0 for setup files, 1 for data files.
File format; always zero for this format.
Tag string. Copied from the setup file used with a time
string appended; or just a time string if no setup file used.
Set up format version; always zero.
1
2-81
82
83
Global instrument configuration; 0x01 bit set for degrees
Fahrenheit, else Centigrade; 0x02 bit set for open
thermocouple checking enabled; 0x80 bit set for alarms on open
thermocouple. See TEMP_CONFIG.
Measurement rate; 0 for slow, 1 for fast. See RATE.
Trigger type; 0 for off, 1 for on, 2 for monitor alarm. See
TRIGGER.
84
85
86
87
88
89
90
91
92
93
94
Output format type; 1 for no units, 2 for units. See FORMAT.
Totalizer debounce; 0 for off, 1 for on. See TOTAL_DBNC.
Interval BCD hours. See INTERVAL.
Interval BCD minutes.
Interval BCD seconds.
Event Status Register (ESR) value.
Service Request Enable (ESE) register value.
Instrument Event Enable (IEE) register value.
Logging status; 0x1 bit set if logging enabled, 0x02 bit
set if LOG queue stops logging when full. See LOG_MODE.
Logging filter; 0 for all, 1 for alarms, 2 for alarm
transitions. See PRINT_TYPE.
95
96
97
Logging destination; 0x01 bit for printer, 0x02 bit set for
LOG queue, 0x04 bit set for memory card. See PRINT_TYPE.
Front panel lock mode; 0 for not locked, 3 for
configuration lock. See LOCK.
98-727 Channel definitions:
Offset within each channel definition
Description
———------——
———
0
Measurement. 0 if off, 1 if vdc, 2 if vac, 3 if
ohms, 4 if frequency, 9 if thermocouple, 11 if RTD.
Measurement range. Lower bit values are measurement
range, with 0 being the lowest range for the
measurement type (e.g., 0 for 300 mVDC).
0x10 bit set if autoranging. See RANGE?
Thermocouple/RTD type. 0 for Pt, 1 for J, 2 for K,
3 for E, 4 for T, 5 for N, 6 for R, 7 for S, 8 for
B, 9 for C.
1
2
3
Alarm flags. 0x01 bit set for limit 1 (SP1) low, 0x02
bit set for SP1 high, 0x04 bit set for limit 2 (SP2)
low, 0x08 bit set for SP2 high. See ALARM_LIMIT.
Alarm limit 1 (4-byte single-precision floating point).
Alarm limit 2 (4-byte single-precision floating point).
Alarm 1 digital I/O association. See ALARM_ASSOC.
Alarm 1 display range. See SCALE_MB (DISPLAY CODE - 1).
Alarm 2 digital I/O association. See ALARM_ASSOC.
Alarm 2 display range. See SCALE_MB (DISPLAY CODE - 1).
Mx+B M value (floating point).
4-7
8-11
12
13
14
15
16-19
20-23
24
Mx+B B value (floating point).
Mx+B M display range. See SCALE_MB (DISPLAY CODE - 1).
MX+B B display range. See SCALE_MB (DISPLAY CODE - 1).
RTD R0 value (floating point). See RTD_R0.
25
26-29
728-729 CRC-16 of the data from offset 82 to 727.
F-2
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Appendices
Memory Card File Formats
F
For a data file, any scan data would immediately follow the configuration information.
Note that it is very possible to have no scan data if the data file is created but scanning is
never done.
Measurements are stored in scan records of variable size. The contents of each record is
as follows:
Offset Description
===== ===========
0
1
Time BCD hours. See TIME_DATE?
Time BCD minutes.
2
3
Time BCD seconds.
Date BCD month.
4
5
Date BCD day.
Date BCD year.
6
7
8-11
Alarm output values. See ALARM_DO_LEVELS?
Digital Input/Output values. See DIO_LEVELS?
Totalizer value, 4-byte single precision floating point.
12-on Measurement values, from 1 to 21 4-byte single precision
floating-point numbers.
The number of floating point values per scan is the number of non-off channels in the
channel configuration data. The number of scans per file varies from zero to tens of
thousands, but will always be an integral number (there will be no partial scans).
Example
The following as an example of how the configuration and scan data can be interpreted
using the C programming language. The C code shown here can be incorporated into a C
program and used to access the information contained in Hydra Data Bucket data files.
These examples can not, however be compiled and used as they are. They are not meant
to be complete C programs.
This first part of the example creates a structure named ‘hydra’ that will hold the
configuration information read from the data file.
F-3
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2635A
Users Manual
/* Hydra Data Bucket data file format: */
struct hydra_config {
unsigned char file_type;
unsigned char file_format;
unsigned char tag[80];
unsigned char setup_format;
unsigned char system;
unsigned char rate;
unsigned char trigger;
unsigned char format;
unsigned char total_debounce;
unsigned char interval_bcd_hours;
unsigned char interval_bcd_minutes;
unsigned char interval_bcd_seconds;
unsigned char ese;
unsigned char sre;
unsigned char iee;
unsigned char log_status;
unsigned char log_filter;
unsigned char log_dest;
unsigned char lock;
struct hydra_chan {
unsigned char function;
unsigned char range;
unsigned char temperature;
unsigned char alarm_flags;
float alarm_limit_1;
float alarm_limit_2;
unsigned char alarm_assoc_1;
unsigned char alarm_dr_1;
unsigned char alarm_assoc_2;
unsigned char alarm_dr_2;
float m;
float b;
unsigned char m_dr;
unsigned char b_dr;
float rtd_r0;
} chan[21];
} hydra;
/*
** A count of the number of channel measurements in each scan record will
** be needed. Also, a table to determine the proper channel number for
** each measurement will be created while getting the channel configuration
** information.
*/
int max_index;
int index_to_chan[21];
F-4
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Appendices
Memory Card File Formats
F
The following function will copy the configuration information from the data file into
the ‘hydra’ structure, keeping track of the number of configured channels and filling the
channel index table as it goes. It assumes that the first 730 bytes of the file have already
been read into memory using the read () library function, or similar.
/*
-* convert_config(): Convert the file configuration data into C variables.
**
** Inputs:
**
**
file_data
Pointer to the first 730 bytes of data
from a Hydra Data Bucket file.
** Outputs:
**
**
**
**
**
hydra
Global variable set to the configuration
found in the file data.
number of channels in scan record and
the table of non-off channels
max_index
index_to_chan
** Returns:
**
*/
number of bytes per scan record.
int
convert_config(unsigned char * file_data)
{
int ch;
/* Must be a data file (file_type must = 1) */
hydra.file_type = *file_data++;
/* Must be version 0 format */
hydra.file_format = *file_data++;
/* Copy tag */
memcpy(hydra.tag, file_data, 80);
file_data += 80;
/* Must be configuration format zero */
hydra.setup_format = *file_data++;
/* Convert global configuration */
hydra.system = *file_data++;
hydra.rate = *file_data++;
hydra.trigger = *file_data++;
hydra.format = *file_data++;
hydra.total_debounce = *file_data++;
hydra.interval_bcd_hours = *file_data++;
hydra.interval_bcd_minutes = *file_data++;
hydra.interval_bcd_seconds = *file_data++;
hydra.ese = *file_data++;
hydra.sre = *file_data++;
hydra.iee = *file_data++;
hydra.log_status = *file_data++;
hydra.log_filter = *file_data++;
hydra.log_dest = *file_data++;
hydra.lock = *file_data++;
/* Convert channel configurations */
/* Count number of non-off channels during conversion */
max_index = 0;
for (ch=0; ch < 21; ch++) {
F-5
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2635A
Users Manual
hydra.chan[ch].function = *file_data++;
hydra.chan[ch].range = *file_data++;
hydra.chan[ch].temperature = *file_data++;
hydra.chan[ch].alarm_flags = *file_data++;
file_data += convert_float(&hydra.chan[ch].alarm_limit_1,
file_data);
file_data += convert_float(&hydra.chan[ch].alarm_limit_2,
file_data);
hydra.chan[ch].alarm_assoc_1 = *file_data++;
hydra.chan[ch].alarm_dr_1 = *file_data++;
hydra.chan[ch].alarm_assoc_2 = *file_data++;
hydra.chan[ch].alarm_dr_2 = *file_data++;
file_data += convert_float(&hydra.chan[ch].m, file_data);
file_data += convert_float(&hydra.chan[ch].b, file_data);
hydra.chan[ch].m_dr = *file_data++;
hydra.chan[ch].b_dr = *file_data++;
file_data += convert_float(&hydra.chan[ch].rtd_r0, file_data);
/* Create index to channel conversion table */
if (hydra.chan[ch].function != 0) {
index_to_chan[max_index++] = ch;
}
}
/* Ignore trailing CRC bytes */
/* return number of bytes per scan record */
return (4 * max_index + 12);
}
/*
-* convert_float(): Convert binary data stream to a floating point variable
**
** This routine assumes that both input and output are four-byte IEEE
** single-precision data in the DOS (Intel x86) architecture. This
** is very machine dependent. You may need to change this routine to
** fit the needs of your architecture.
**
** Inputs:
**
**
**
float_dest
src
Pointer to C floating point variable (destination).
Pointer to four bytes of binary file data.
** Outputs:
**
float_dest
Set to a floating point value.
**
** Returns:
**
*/
Number of bytes consumed (4)
int
convert_float(float * dest, unsigned char * src)
{
unsigned char * byte_dest = (unsigned char *) dest;
*byte_dest++ = *src++;
*byte_dest++ = *src++;
*byte_dest++ = *src++;
*byte_dest = *src;
return sizeof(float);
}
F-6
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Appendices
Memory Card File Formats
F
Now that the configuration has been processed and the number of valid channels has
been determined, the scan data can be processed.
/* Measurements are stored in scan records of variable size.
** This C structure is the decoded version of a scan record,
** and is of fixed size (unused measurement values are not set).
*/
struct scan_record {
/* Timestamp */
unsigned char bcd_hours;
unsigned char bcd_minutes;
unsigned char bcd_seconds;
unsigned char bcd_month;
unsigned char bcd_day;
unsigned char bcd_year;
/* Digital (alarm) outputs */
unsigned char dout;
/* Digital input/outputs */
unsigned char dio;
/* Totalizer value */
float total;
/* Measurement per channel */
float meas[21];
} scan;
/*
-* convert_scan_record(): Convert a scan record into usable data
**
** In each data file, after the 730 bytes of configuration data, an
** array of scan records may be found (it is possible for data files
** to have no scan data). This routine converts a single scan record
** and places it in the given destination buffer.
**
** Note that convert_config() must be called before this routine!
**
** Inputs:
**
**
**
**
**
**
**
**
**
**
hydra
File configuration data.
number of channels in scan record and
the table of non-off channels
A single scan record from the same data file.
that was last processed by convert_config().
Note that this routine assumes that the
number of bytes in this buffer is exactly the
number of bytes per scan record.
max_index
index_to_chan
file_data
scan
Pointer to destination scan record buffer.
** Outputs:
**
*/
scan
Set to converted version of scan record.
void
convert_scan_record(unsigned char * file_data, struct scan_record * scan)
{
int index;
int ch;
F-7
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/* Set timestamp */
scan->bcd_hours = *file_data++;
scan->bcd_minutes = *file_data++;
scan->bcd_seconds = *file_data++;
scan->bcd_month = *file_data++;
scan->bcd_day = *file_data++;
scan->bcd_year = *file_data++;
/* Get digital I/O and totalizer values */
scan->dout = *file_data++;
scan->dio = *file_data++;
file_data += convert_float(&scan->total, file_data);
/* Get measurement for each non-off channel in this scan */
for (index=0; index < max_index; index++) {
/* Convert index to channel */
ch = index_to_chan[index];
/* Read this channel’s scan data */
file_data += convert_float(&scan->meas[ch], file_data);
}
}
Using the above routines to decode the configuration of a data file and get the contents
of the first scan record will require something like the following:
char * file = “DAT00.HYD”;
int fd;
unsigned char buf[730];
int record_size;
/* Open the binary data file name pointed to by “file” */
fd = open(file, (O_RDONLY | O_BINARY));
/* Read and interpret the configuration header in the file */
read(fd, buf, 730);
record_size = convert_config(buf);
/* Read and convert the scan measurements */
read(fd, buf, record_size);
convert_scan_record(buf, &scan);
F-8
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Appendix G
True RMS Measurements
Introduction
The instrument measures the true value of ac voltages. In physical terms, the rms (root-
means-square) value of a waveform is the equivalent dc value that causes the same
amount of hear to be dissipated in a resistor. True rms measurement greatly simplifies
the analysis of complex ac signals. Since the rms value is the dc equivalent of the
original waveform, it provides a reliable basis for comparing dissimilar waveforms.
Effect of Internal Noise in AC Measurements
With the input shorted and the channel set for ac volts (VAC) measurement, internal
amplifier noise causes a typical display reading of approximately 0.50 mv ac. Since the
instrument is a true rms responding measurement device, this noise contributes
minimally to the readings at the specified floor of each range. When the rms value of the
two signals (internal noise and range floor) is calculated, the effect of the noise is shown
as:
Total rms digits = Square Root of (0.502 + 15.002) = 15.008
The display will read 15.01. At the 28.00 mV input level on the 300.00 mV range in the
slow rate, the display will read 28.00 with no observable error.
Waveform Comparison (True RMS VS Average Responding)
Figure H-1 illustrates the relationship between ac and dc components for common
waveforms and compares readings for true rms measurements (Hydra) and average-
responding measurements. For example, consider the first waveform, a 1.41421V (zero-
to-peak) sine wave. Both the instrument and rms-calibrated average-responding
measurement devices display the correct rms reading of 1.0000V ac (the dc component
equals ). However, consider the 2V (peak-to peak) square wave.
Both types of measurement correctly display the dc component (0V), but the instrument
also correctly measures the ac component (1.0000V). The average-responding device
measures 1.11V, which amounts to an 11% error.
Average-responding measurement devices have been in use for a long time; you may
have accumulated test or reference data based on such instruments. The conversion
factors in Figure G-1 can help in converting between the two measurement methods.
G-1
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PEAK VOLTAGES
MEASURED VOLTAGES
AC COMPONENT ONLY
DC AND AC
TOTAL RMS
AC-COUPLED
INPUT
WAVEFORM
DC
TRUE RMS =
ac2 + dc2
COMPONENT
ONLY
PK-PK
2.828
0-PK
RMS CAL*
HYDRA
SINE
1.414
PK
0
1.000
PK-PK
1.000
0.000
0.900
1.000
1.000
1.000
RECTIFIED SINE
(FULL WAVE)
1.414
2.000
1.414
2.000
0.421
0.779
PK
0.436
PK-PK
0
RECTIFIED SINE
(HALF WAVE)
PK
0.771
1.000
PK-PK
0.636
0.000
0.707
0
SQUARE
PK
2.000
1.414
2.000
1.000
1.414
1.111
0.785
0
PK-PK
1.000
1.000
RECTIFIED
SQUARE
PK-PK
0.707
PK
0
RECTANGULAR
PULSE
2.000
PK
4.442 K2
PK-PK
X
0
2K
Y
2D
D = X/Y
K = D-D2
2 D
TRIANGLE
SAWTOOTH
3.464
1.732
PK
0.962
1.000
0
PK-PK
0.000
1.000
*
RMS CAL IS THE DISPLAYED VALUE FOR AVERAGE RESPONDING INSTRUMENTS THAT ARE CALIBRATED
TO DISPLAY RMS FOR SINE WAVES
078f.eps
Figure G-1. Comparison of Common Waveforms
G-2
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Hydra Configuration Record
SET-UP NAME_________________________________________ DATE_________________________
SCAN RATE:
q Slow
q Fast
TEMPERATURE UNITS q °C q°F
RS-232-C COMMUNICATION
SCAN INTERVAL:_______ :_______: _______
Baud Rate q 38400 q 19200 q 9600 q 4800
q 2400
Parity q Even
q
q
q
q
1200 q 600 q 300
OUTPUT:
q Printer
Odd
Off
q None
q Memory
CTS
Echo
q On
q On
Mode: q All Data
Off
q Alarm Data
q Alarm Transition Data
TRIGGERS:
q Off
q External q Monitor Alarm Ch# ____ Totalizer Debounce q On q Off
Chan
Input Name
Type
Range
LIM 1
Alarm
LIM 2
Alarm
M
B
Output
Output
0
0
0
1
1
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
7
8
8
8
9
9
9
10
11
12
13
14
15
16
17
18
19
20
10
11
12
13
14
15
16
17
18
19
20
10
11
12
13
14
15
16
17
18
19
20
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Hydra Memory Card Record
DATA FILES
Application
SET-UP FILES
Application
DATxx
Note
SETxx
Note
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Index
channel integrity test, 7-8
cleaning, 7-3
Clearing alarm parameters from a channel, 2-19
Clearing Mx+B scaling from a channel, 2-23
Common mode rejection, A-10
—2—
computer interface command set, 4-18
computer interface commands and
—A—
AC operation, 1-13
Ac signal cross talk in a dc voltage channel, B-1
Ac signal cross talk into a frequency
Ac signal cross talk into an ac voltage
channel, B-2
Ac signal cross talk into an ohms channel, B-2
Ac signal crosstalk into a temperature
channel, B-3
AC Voltage Measurements, A-8
accuracy verification test, 7-7
adjusting the handle, 1-12
computer operation, 1-8
configuring a channel to measure ac volts, 2-10
configuring a channel to measure dc volts, 2-9
configuring a channel to measure frequency, 2-12
configuring a channel to measure resistance, 2-11
configuring a measurement channel, 2-8
configuring for printer operations, 5-5
configuring the instrument for computer
operations, 4-5
configuring the instrument for modem
operations, 6-7
configuring the instrument for operation, 2-6
configuring the instrument modem for modem
operations, 6-4
Alarm indications while monitoring, 2-19
Alarm indications while reviewing, 2-19
Alarm indications while scanning, 2-18
Alarm outputs, 1-17
configuring the pc for computer operations, 4-6
connecting the instrument to a pc, 4-3
connecting the instrument to a power
alarm outputs and digital I/O, 1-9
alarm outputs connections, 1-17
Alarm outputs for channel 0 to 3 using the alarm
outputs connector, 2-19
connecting the instrument to a printer, 5-3
connecting the modem to a pc for modem
configuration, 6-4
Alarm outputs for channels 4 to 20 using the
digital I/O connector, 2-19
alarms, 1-9
connecting the modem to an instrument, 6-6
connector set, 2620a-100, 1-10
controls and indicators, 1-19
crosstalk, 1-14
Cross-talk rejection, A-8
Alarms and autoprinting, 2-20
Alarms and monitor-alarm triggering, 2-20
Alarms and Mx+B scaling, 2-20
applications software, 1-9
—C—
—D—
calibration, 7-21
data file procedures, 3-12
changing the memory card during scanning, 3-5
1
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DC operation, 1-13
DC power, 1-17
memory card capacity, 3-4
Memory card capacity, 2-26
Memory card data extraction, 2-27
Memory card exchange during scanning, 2-26
memory card file operations to and
Decoding the ascii string, C-1
dedicated alarm output test, 7-18
digital I/O connections, 1-18
Digital input test, 7-16
Digital output test, 7-15
Memory card files, 2-26
Memory card formatting, 2-26
memory card operation, 1-7
memory card reader, 1-10
modem operation, 1-8
Monitor-alarm trigger, 2-31
Mx+B scaling, 1-9
—E—
Example, C-7
Examples, 2-23
External trigger input, 1-17
external trigger input test, 7-21
—O—
open thermocouple response test, 7-11
options and accessories, 1-10
—F—
Floating point conversion, C-4
four-terminal resistance test, 7-10
front panel controls, 1-19
front panel indicators, 1-19
front panel operation, 1-7
—P—
performance tests, 7-4
printer operation, 1-8
printing measurement data and memory card
directory, 5-6
printing measurement results during
printing the directory of the memory card, 5-9
printing the review array, 5-8
—H—
how the instrument processes input, 4-12
how the instrument processes output, 4-13
hydra logger package, 1-10
hydra starter package, 1-10
—R—
Rate, A-14
recording measurement results during
—I—
initializing a memory card, 3-7
input channels, 1-13
removing a memory card, 3-5
Resistance temperature detectors
Resistance-temperature detectors, 2-13
RTD temperature accuracy test, 7-13
RTD temperature accuracy test (using decade
resistance source), 7-13
Input debouncing, A-14
input string examples, 4-13
input terminators, 4-12
Input voltage, A-14
inserting a memory card, 3-5
inserting and removing the memory card, 3-5
installing or replacing the memory card
battery, 3-5
Instrument event register (IER), 4-14
Isolation, A-14
RTD temperature accuracy test (using DIN/IEC
751 RTD), 7-14
—S—
—L—
selecting a channel, 2-8
selftest diagnostics and error codes, 7-4
sending numeric values to the instrument, 4-13
Sensitivity, A-12
line fuse, 7-3
—M—
service, 7-22
setting the memory card write-protect
Maximum autoranging time, A-14
measurement capabilities, 1-9
Memory card as a data destination, 2-26
memory card battery, 3-5
setting the Mx+B scaling, 2-23
2
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Index (continued)
setting up the instrument, 1-11
setup and data file current status, 3-15
setup and data files directory, 3-14
setup file procedures, 3-9
Totalizer input, 1-18
Totalizer sensitivity test, 7-18
Standard event status register (ESR), 4-16
Status byte register (STB), 4-17
status registers, 4-14
Totalizing input, A-14
Triggering options and memory card
operation, 2-31
summary of computer operations, 4-3
summary of front panel operations, 2-5
summary of memory card operations, 3-3
summary of modem operations, 6-3
summary of printer operations, 5-3
turning the power on, 2-6
—U—
universal input module connections, 1-14
unpacking and inspecting the instrument, 1-11
using data erase, 3-13
—T—
using data open, 3-12
using setup erase, 3-11
using setup load, 3-10
using setup store, 3-9
using shielded wiring, 1-14
using the scan mode, 2-26
testing the instrument/pc RS-232 interface, 4-6
testing the RS-232 interface using gwbasic, 4-9
testing the RS-232 interface using Qbasic, 4-10
testing the RS-232 interface using terminal
emulation (generic), 4-7
testing the RS-232 interface using terminal
emulation (windows), 4-6
testing the RS-232/modem interface, 6-8
thermocouple measurement range accuracy
test, 7-9
—V—
variations in the display, 7-22
Thermocouple restrictions:, 2-13
thermocouple temperature accuracy test, 7-10
Thermocouples, 2-13
—X—
xmodem file transfers, 4-18
Threshold, A-14
3
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4
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