User Manual
1740A/1750A Series
Waveform/Vector Monitor
070-8470-06
This document supports firmware version 2.2 and
above.
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General Safety Summary
The common terminal is at ground potential. Do not connect
the common terminal to elevated voltages.
Do Not Operate Without Covers. Do not operate this
product with covers or panels removed.
Use Proper Fuse. Use only the fuse type and rating speci-
fied for this product.
Avoid Exposed Circuitry. Do not touch exposed connec-
tions and components when power is present.
Do Not Operate With Suspected Failures. If you suspect
there is damage to this product, have it inspected by qualified
service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installa-
tion instructions for details on installing the product so it has
proper ventilation.
Safety Terms and Symbols
Terms in This Manual. These terms may appear in this
manual:
WARNING. Warning statements identify conditions or practices
that could result in injury or loss of life.
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General Safety Summary
CAUTION. Caution statements identify conditions or practices
that could result in damage to this product or other property.
Terms on the Product. These terms may appear on the
product:
DANGER indicates an injury hazard immediately accessible
as you read the marking.
WARNING indicates an injury hazard not immediately
accessible as you read the marking.
CAUTION indicates a hazard to property including the
product.
Symbols on the Product. These symbols may appear on
the product:
Double
Insu-
Protective
Ground (Earth)
Terminal
CAUTION
Refer to
Manual
WARNING
High Volt-
age
lated
Not suitable for
connection to
the public tele-
communica-
tions network
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TABLE OF CONTENTS
Introduction
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cord Options . . . . . . . . . . . . . . . . . . . . . . .
CRT Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5
1-5
1-6
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-7
Standard Accessories . . . . . . . . . . . . . . . . . . . . .
Optional Accessories . . . . . . . . . . . . . . . . . . . . . .
Field Upgrade Kits . . . . . . . . . . . . . . . . . . . . . . . .
1-7
1-7
1-8
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-9
Repackaging for Shipment . . . . . . . . . . . . . .
1-9
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . 1-10
Mains Frequency and Voltage Range . . . . . 1-11
Remote Connector . . . . . . . . . . . . . . . . . . . . . 1-11
RS232 Connector . . . . . . . . . . . . . . . . . . . . . . . 1-11
Mechanical Installation . . . . . . . . . . . . . . . . . . . . 1-12
Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Custom Installation . . . . . . . . . . . . . . . . . . . . . 1-12
Rackmounting . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Instrument Configuration . . . . . . . . . . . . . . . . . . . . . . . . 1-15
At A Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front-Panel Controls . . . . . . . . . . . . . . . . . . . . . .
Rear-Panel Connectors . . . . . . . . . . . . . . . . . . . .
2-1
2-1
2-8
Operator’s Checkout Procedure . . . . . . . . . . . . . . . . . . 2-12
Required Equipment . . . . . . . . . . . . . . . . . . . . 2-12
Initial Equipment Connections . . . . . . . . . . . . 2-12
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Operation Basics
Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1
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Table of Contents
Display Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Picture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multiple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying a Signal . . . . . . . . . . . . . . . . . . . . . . . .
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1
3-1
3-1
3-2
3-2
3-2
3-3
3-3
3-3
3-3
Using the Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5
General Menu Information . . . . . . . . . . . . . . . . .
Multi-Use Bezel Controls and Buttons . . . . .
Moving Between Menus . . . . . . . . . . . . . . . . .
Clear Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exiting a Menu Function . . . . . . . . . . . . . . . . .
Filter Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cursor Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waveform Cursor Control . . . . . . . . . . . . . . . .
3-5
3-5
3-5
3-6
3-6
3-7
3-8
3-9
Vector + Waveform (Multiple) . . . . . . . . . . . . 3-11
Using the Cursors . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Line Select Menu . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Preset Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Configure Menu . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
VECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
FORMAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
STANDARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
OFFSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
CALIBRATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
REMOTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
REFERENCE (Dual Standard Only) . . . . . . . 3-23
Gain Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
CRT Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
Remote Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Using Presets through the Remote . . . . . . . 3-25
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Table of Contents
Making Measurements
Basic Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1
Waveform Graticule . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Scale . . . . . . . . . . . . . . . . . . . . . . . .
NTSC Vertical Scales . . . . . . . . . . . . . . . . . . . .
PAL Vertical Scale . . . . . . . . . . . . . . . . . . . . . .
Dual-Standard Vertical Scale . . . . . . . . . . . . .
4-1
4-1
4-2
4-3
4-4
Making Waveform Measurements . . . . . . . . . . .
Horizontal Sync Amplitude . . . . . . . . . . . . . . .
Peak White . . . . . . . . . . . . . . . . . . . . . . . . . . . .
K-Factor Measurements . . . . . . . . . . . . . . . . .
4-5
4-5
4-5
4-5
Vector Graticule . . . . . . . . . . . . . . . . . . . . . . . . . . .
Making Vector Measurements . . . . . . . . . . . . . .
Chroma Bandwidth . . . . . . . . . . . . . . . . . . . . .
Differential Phase and Gain . . . . . . . . . . . . . .
4-7
4-9
4-9
4-9
Making SC/H Phase Measurements . . . . . . . . 4-10
NTSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
PAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
SC/ H R --- Y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 -12
Making Audio Measurements . . . . . . . . . . . . . . . 4-15
Time Code Display . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Adjusting Instrument Gain . . . . . . . . . . . . . . . . . 4-17
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Table of Contents
Appendices
Appendix A
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . A-1
Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications . . . . . . . . . . . . . . . . .
A-1
A-2
Certifications and compliances . . . . . . . . . . . A-13
Appendix B
Remote Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Remote Connector Converter . . . . . . . . . . . . . . . B-4
Appendix C
User Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Cleaning or Replacing the Fan Filter . . . . . . . . . C-1
Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . C-1
Graticule Light Replacement . . . . . . . . . . . . . . . C-2
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
Replacing the CRT Filter . . . . . . . . . . . . . . . . . . . C-5
Appendix D
Software Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I-1
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Table of Contents
LIST OF FIGURES
Figure 2-1. Multi-Use Bezel Controls and Buttons. . . . . . . . .
Figure 2-2. 1740A Front Panel. . . . . . . . . . . . . . . . . . . . . . .
Figure 2-3. 1750A Front Panel. . . . . . . . . . . . . . . . . . . . . . .
2-2
2-3
2-4
Figure 2-4. 1740A/ 1750A-Series Rear Panel. . . . . . . . . . . . 2-10
Figure 2-5. Equipment hook-up for Operator’s Checkout
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Figure 2-6. Calibrator display. . . . . . . . . . . . . . . . . . . . . . . . 2-14
Figure 2-7. Two-Line LUM filter display of color bar signal. . . 2-17
Figure 2-8. Two-Line CHROM filter display of color bar signal.
2-17
Figure 2-9. Two-Line DIFF filter display. . . . . . . . . . . . . . . . . 2-18
Figure 2-10. Two-Line R-Y display of color bar signal. . . . . . . 2-19
Figure 2-11. SC/H R-Y display (NTSC). . . . . . . . . . . . . . . . . 2-19
Figure 2-12. SC/H R-Y display (PAL). . . . . . . . . . . . . . . . . . . 2-20
Figure 2-13. Line Select display in 2 FIELD sweep. . . . . . . . . 2-21
Figure 2-14. Vectorscope color bar display. . . . . . . . . . . . . . .
Figure 2-15. Picture mode display of color bar signal. . . . . . . .
Figure 2-16. Audio display with phase error. . . . . . . . . . . . . . .
2-22
2-22
2-23
Figure 2-17. NTSC SC/H display. . . . . . . . . . . . . . . . . . . . . . 2-24
Figure 2-18. PAL SC/H display. . . . . . . . . . . . . . . . . . . . . . . . 2-24
Figure 3-1. The CRT menu. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-2. The VECTOR CURSOR menu. . . . . . . . . . . . . .
3-6
3-8
Figure 3-3. The WAVEFORM CURSOR menu. . . . . . . . . . . . 3-10
Figure 3-4. The VECTOR+WFM CURSOR menu. . . . . . . . . 3-10
Figure 3-5. The PRESET menu display. . . . . . . . . . . . . . . . . 3-16
Figure 3-6. The CONFIGURE menu display. . . . . . . . . . . . . 3-19
Figure 4-1. NTSC waveform/vector graticule. . . . . . . . . . . . .
Figure 4-2. PAL waveform/vector graticule. . . . . . . . . . . . . .
Figure 4-3. Dual Standard waveform/vector graticule. . . . . . .
Figure 4-4. Vector targets. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-5. Differential Gain and Phase Measurements. . . . .
Figure 4-6. NTSC dual-dot SC/H display. . . . . . . . . . . . . . . .
Figure 4-7. NTSC single-dot SC/H display. . . . . . . . . . . . . . .
4-2
4-3
4-4
4-8
4-9
4-11
4-11
Figure 4-8. PAL SC/H display. . . . . . . . . . . . . . . . . . . . . . . . 4-12
Figure 4-9. Two-Line SC/H R-Y display (NTSC). . . . . . . . . . 4-13
Figure 4-10. Two-Field SC/H R-Y display (NTSC). . . . . . . . . . 4-13
Figure 4-11. Two-Field SC/H R-Y display (NTSC), showing
approximate 10° phase error. . . . . . . . . . . . . . . . 4-14
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Table of Contents
Figure 4-12. Two-Field SC/H R-Y display (PAL). . . . . . . . . . . 4-14
Figure 4-13. Audio displays. . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Figure B-1. Rear panel REMOTE connector. . . . . . . . . . . . .
Figure B-2. REMOTE adapter. . . . . . . . . . . . . . . . . . . . . . . .
Figure B-3. Rear panel RS232 connector. . . . . . . . . . . . . . . .
B-1
B-4
B-5
Figure C-1. Graticule light replacement. . . . . . . . . . . . . . . . .
C-3
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Preface
This user manual is one of a set of two manuals that document the
Tektronix 1740A/1750A-Series Waveform/Vector monitors. To
purchase a service manual, please refer to “Contacting Tektronix” on
Page xiv for address and phone number information.
User Manual
Instrument controls and readouts appear in ALL CAPITALS.
Topics covered in the user manual are as follows:
Introduction
Getting Started
Operation Basics
Making Measurements
Appendix A provides instrument specifications, both
electrical and mechanical.
Appendix B describes remote control interfaces.
Appendix C covers routine service procedures, such as
replacing fuses and graticule light bulbs.
The appendixes are followed by a glossary of specialized
terms and an index.
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Preface
Service Manual
Topics covered in the service manual are as follows:
Specifications
Operating Information
Theory of Operation
Performance Verification
Adjustment Procedures
Maintenance
Options
Electrical Parts List
Diagrams
Mechanical Parts List
xii
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Preface
1750A Waveform / Vector Monitor.
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Introduction
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Product Description
The 1740A/1750A-Series are combination waveform/vector
monitors in half-rack size packages. The 1740A-Series
provides all basic waveform monitor and vectorscope func-
tions; the 1750A-Series provides the same functions with
SCH measurement capabilities added. The following products
are available:
1740A / 1750A NTSC
1741A / 1751A PAL
1745A / 1755A NTSC / PAL (dual-standard)
Applications
Typical applications for these monitors include video signal
monitoring in camera control units, VTR bridges, production
switcher consoles, mobile vans and field production systems.
The 1740A-Series is well-suited for portable applications
where a small, lightweight monitor is needed, and SCH
capability is not required. It is appropriate for many VTR
bridge applications, providing remote control and 90/100 Hz
sweeps for D-2 servo observation.
The 1750A-Series is useful in the composite edit suite,
providing all 1740A-Series features, plus the Tektronix polar
SCH display to match color subcarrier-to-horizontal sync
timing and color framing among edit sources.
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Product Description
Features
H
H
H
H
H
H
H
Composite or Component Waveform Monitoring
Composite Vector Display
Menu-Assisted Operation allows expanded feature set.
Assignable cursors for time and voltage.
Picture monitor mode for verifying signal source
Stereo Audio Display
Longitudinal time code display mode for editing applica-
tions
H
H
SCH and Color Framing Display (1750A-Series only)
External staircase from a camera control unit can be
selected remotely.
H
Internal video filters provide specialized measurements,
with dual or triple filter modes available in PARADE or
OVERLAY.
H
H
Eight video inputs can be individually displayed or
selected in various combinations.
Remote interface and serial RS232 interface.
Description of Features
Menu
A notable feature of these monitors is the menu-assisted
operation. An expanded feature set is possible through the
use of menus and multi-use controls and buttons. When the
operator selects a menu item, such as VOLTAGE/TIMING
CURSORS, VARIABLE GAIN, or LINE SELECT, an on-screen
label shows the current function of the controls.
Many instrument configurations that required moving inter-
nal jumpers or wire straps in the 1740/1750-Series monitors
are made through an on-screen menu in the 1740A/1750A-
Series. The operator can also recall up to 10 front-panel
setups through the RECALL menu; 9 recalls are user-program-
1-2
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Product Description
mable and 1 is factory-programmed. The FILTER menu also
provides a choice of four filters in addition to flat. Two
combination filtering modes can be displayed in OVERLAY or
PARADE. Refer to “Using the Menus” on page 3-5 for more
menu information.
CRT
The monitors have a bright, post-accelerated CRT with
lighted internal graticule. The parallax-free internal graticule
structure contains targets and markings for both the vector
and waveform functions. A white phosphorus CRT is option-
al; refer to page 1-6 for details.
The bright CRT allows use in high ambient light conditions,
such as those encountered in field production applications.
Calibrator
Vertical and horizontal instrument gain can be set using the
calibrator signal. The 1 Volt calibrator signal is available in
100 kHz and FSC (color subcarrier) rates.
More Information
H
Standard and optional accessories are listed in the
Accessories section, which follows this product descrip-
tion.
H
H
Instrument options are listed on page 1-5.
A complete listing of instrument specifications begins on
Appendix page A-1.
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Product Description
1-4
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Options
White phosphor CRT and power cord options are the only
options currently available for the 1740A/1750A-Series.
Field upgrade kits listed in this section can also be used with
these monitors.
Power Cord Options
Any of the following power cord options can be ordered for
the 1740A/1750A-Series. If no power cord option is speci-
fied, instruments are shipped with a North American 125 V
power cord and one replacement fuse.
Unless otherwise specified, power cords for use in North
America are UL listed and CSA certified. Cords for use in
areas other than North America are approved by at least one
test house acceptable in the country to which the product is
shipped.
Option A1. Power, Universal Europe, 220 V/16 A
(Locking Power Cord)
Option A2. Power, United Kingdom, 240 V/15 A
(Power Cord)
Option A3. Power, Australia, 240 V/10 A
(Power Cord)
Option A4. Power, North America, 250V/10 A
(Power Cord)
Option A5. Power, Swiss, 240 V/6 A
(Power Cord)
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Options
CRT Options
The standard instrument is shipped with a P31 (green)
phosphor CRT installed. If Option 74 is ordered, the instru-
ment is shipped with a P4 (white) phosphor CRT installed.
The Option 74 CRT part numbers are given in the service
manual, at the end of the Replaceable Electrical Parts List.
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Accessories
Standard Accessories
These accessories are included with the product:
1
1
1
1
4
4
Manual, user: 1740A/1750A-Series
(070-8470-XX)
Cable assembly, power: United States and Japan
only (161-0216-XX)
Cable assembly, power: all other countries
(161-0066-XX)
Fuse, cartridge: 3AG, 2A, 250V, fast-blow
(159-0021-00)
Light bulbs: graticule scale (150-0168-00). See
page C-1 for replacement instructions.
Air filters: fan (378-0335-00). See page C-1 for
replacement instructions.
This accessory is installed on the product:
CRT filter: smoke gray (378-0258-00)
1
Optional Accessories
Manual, service: 1740A/1750A/1760-Series
(070-8469-XX)
Camera, C9 Option 20
Viewing Hood (016-0475-00)
Front-Panel Cover (200-3897-01)
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Accessories
Field Upgrade Kits
1700F00 Plain Cabinet — This plain metal half-rack
size cabinet is painted silver-gray. Ventilating holes in top,
bottom, and sides of the cabinet allow heat generated within
the instrument to dissipate.
1700F02 Carrying Case — This portable cabinet is
similar to the 1700F00, but has feet, carrying handle, flips-
tand, and front cover.
1700F05 Side-by-Side Rack Adapter — The
1700F05 allows the user to mount two half-rack width
instruments in a standard 19-inch rack.
1700F06 Blank Panel — If only one section of a
1700F05 is used, the 1700F06 Blank Panel can be inserted in
the unused section to improve appearance and air flow.
1700F07 Utility Drawer — When only one side of a
1700F05 is used, this utility drawer can be installed in the
unused section to provide storage. The drawer opens and
closes freely, unless latched for transport.
Installation — Cabinet installation instructions begin on
page 1-12. Dimensional drawings are also shipped with each
cabinet. For more information, contact a Tektronix field
office or distributor.
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Installation
Accessories
Check that the following accessory items are included:
H
H
User Manual
Service Manual
Note: The Service Manual is an optional accessory
that must be ordered to be received.
H
H
H
H
Power Cord
Replacement Fuse Cartridge (1)
Replacement Graticule Light Bulbs (4)
Replacement Air Filters for Fan (4)
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Electrical Installation
Power Source
These monitors are designed to operate from a single-phase
power source having one of its current-carrying conductors at
or near earth ground (the neutral conductor). Only the line
conductor is fused for over-current protection. Systems that
have both current-carrying conductors live with respect to
ground (such as phase-to-phase on multiphase systems) are
not recommended as power sources. A protective ground
connection by way of the grounding conductor in the power
cord is essential for safe operation.
NOTE
When power is supplied, line voltage will be
present in the instrument, even if the POWER switch
is set to STANDBY.
1-10
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Installation
WARNING
Mains Frequency and Voltage Range
The 1740A/1750A-Series monitors operate at 50 and 60 Hz,
over the range of 90-250 Volts, without operator adjustment.
Remote Connector
The rear-panel REMOTE connector is a 25-pin, D-type connec-
tor. It provides the input for RGB/YRGB staircase, external
horizontal, and remote sync. It also accepts the input signals
for external blanking, time code, stereo L and R audio. TTL
signal or ground closure to designated pins will enable
Staircase, External Horizontal, or Remote Sync displays.
Eight front-panel setups can also be stored and recalled
through the REMOTE connector. REMOTE connector pin
assignments begin on page B-1.
RS232 Connector
The rear-panel RS232 connector is a 9-pin subminiature
D-type connector that provides a serial interface for remote
control. The RS232 pin assignments are given on page B-1.
The RS232 interface is not supported at the time of this
printing.
Operational Changes
No operational modifications are made to these monitors
through internal jumper settings. Input coupling, DC RE-
STORER clamp time, RGB/YRGB selections and other similar
configurations are changed through the on-screen menu.
Instrument configuration is described on page 3-18.
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Installation
Mechanical Installation
All qualification testing was performed with a Tektronix
1700F00 cabinet installed. To guarantee compliance with
specifications, the instrument should be operated in a cabinet
or rackmount adapter. The Tektronix 1700F00, 1700F02,
and 1700F05 provide the proper electrical environment for
the instrument, supply adequate shielding, minimize handling
damage, and reduce dust collection within the instrument.
Cabinets
WARNING
Do not lift a cabinetized instrument without instal-
ling the mounting screws. There is nothing to hold
the instrument in the cabinet if it is tipped forward.
The 1700F00 is a plain cabinet designed for permanent
installations, and the 1700F02 is a portable cabinet with
handle, feet, flipstand, and front cover. Ordering information
is given on page 1-8.
Custom Installation
For applications such as consoles, the instrument can be
mounted with front molding flush or protruding from the
console. In both cases, allow approximately three inches of
rear clearance for BNC and power-cord connections. To
mount the instrument safely, attach it to a shelf strong
enough to hold its weight, using the four 0.156-inch diameter
holes in the bottom of the 1700F00 cabinet. Refer to the data
sheet included with the cabinet for hole locations.
1-12
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Installation
Rackmounting
The 1740A/1750A-Series monitors are half-rack width and
three rack units high. They require approximately three
inches of rear clearance for power cord and cable connec-
tions, and 20 inches in front of a rack for installation and
removal of the instrument.
The optional 1700F05 rack adapter allows two Tektronix
half-rack instruments to be mounted side-by-side in a rack.
It is adjustable so that the instrument can be closely aligned
with other equipment in the rack. If only one section of the
rack adapter is used, a 1700F06 blank panel or 1700F07
utility drawer can be inserted in the unused section. Order-
ing information is given on page 1-8.
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Instrument Configuration
Focus, scale illumination, signal intensity, readout intensity,
and trace rotation are set through the CRT menu.
Several instrument operating parameters can be set through
the CONFIG menu.
Instructions for using these menus begin on page 3-18.
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Getting Started
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com
AT A GLANCE
Front-Panel Controls
The following is an overview of front-panel controls.
Figure 2-2 shows the 1740A front panel and Figure 2-3
shows the 1750A front panel.
C o n t r o l s --- S w i t c h e s --- L E D s
H
All front-panel controls are the continuous action
type, and all front-panel buttons are push-and-re-
lease toggle switches.
H
Green LEDs light to indicate the current switch
selection.
POWER
H
ON/STANDBY turns the instrument on or to standby
status. An LED indicates when power is on.
WARNING
If an appropriate power source is supplied to this
instrument, line voltage will be present, even when
in STANDBY mode. Do not operate the instrument
without a cabinet or rack adapter such as those
described on page 1-8; serious injury could result.
Instrument Reset
Certain conditions may cause the 1740A/1750A-Series
instrument front-panel controls to become locked. Reset as
follows:
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At A Glance
H
H
Turn off instrument power.
Depress and hold the CLEAR MENU and WAVEFORM
buttons while you turn instrument power on again. Hold
both buttons in until the instrument returns to its normal
operating state.
H
If this reset does not unlock the controls, contact your
Tektronix field office or call Tektronix at the phone
number listed in the front of this manual.
Multi-Use Controls
H
The center three controls located under the CRT
have functions assigned and labeled through the
on-screen menus and readouts. These controls will
be referred to as Bezel Controls. See Figure 2-1.
H
Five small buttons along the right side of the CRT
enable users to make selections when on-screen
menus are in use. These buttons will be referred to
as Bezel Buttons.
Five
Bezel
Buttons
VERTPOS
HORIZPOS
CLEAR
MENU
Three Bezel Controls
Figure 2-1. Multi-Use Bezel Controls and Buttons.
2-2
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At A Glance
Figure 2-2. 1740A Front Panel.
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At A Glance
Figure 2-3. 1750A Front Panel.
2-4
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At A Glance
POSITION
H
VERT POS allows the signal display to be moved
vertically. Offsets for channels A2/A3 and B2/B3
are enabled through the CONFIGURE menu.
DISPLAY
H
H
H
H
H
H
H
WAVEFORM provides voltage vs. time display of the
video signal.
VECTOR presents an XY plot of demodulated chromi-
nance phase and amplitude.
AUDIO amplitude and phase is monitored using a
calibrated X/Y Lissajous display.
SCH provides a vector display of the subcarrier-to-
horizontal-sync phase relationship.
PICTURE allows the operator to verify the signal
source.
TIME CODE provides monitoring of longitudinal time
code in a frame-rate display.
MULTIPLE allows simultaneous selection of multiple
DISPLAY modes.
SWEEP
Sweep buttons are used to select the waveform sweep rate.
H
LINE/FIELD sequences through four sweep rate
selections: one line, two line, one field, and two
field.
H
MAG turns on the sweep magnifier. See page 3-4.
DC REST
H
RESTORE turns DC Restorer on or off. The DC
Restorer speed and clamp point are selected through
the CONFIGURE menu, shown on page 3-18.
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At A Glance
REF
H
EXT toggles between external reference (EXT LED
on) and internal reference. Internal reference can be
configured for component operation, and two
external reference inputs can be designated for
dual-standard instruments. See the CONFIGURE men
on page 3-18.
INPUT
H
Selecting a front-panel input causes the signal that is
input to the corresponding rear-panel connector to
be displayed on screen.
H
Without PARADE or OVERLAY selected, only one
input selection can be made at a time. Each input
channel button (including A123 / B123) toggles
between A and B, and is cancelled when another
input button is pressed.
H
With PARADE or OVERLAY selected, multiple input
selections can be made; input buttons select A, B,
both, or off, and do not cancel each other.
A123
A123 provides a side-by-side display of the CH-A1,
CH-A2, and CH-A3 inputs (B123 displays the CH-B1,
CH-B2, and CH-B3 inputs). Selecting A123or B123
turns off all other input channels. When PARADE or
OVERLAY is selected, A123 and B123 can be displayed
together and in combination with other inputs.
PARADE
PARADE displays up to four input channels side-by-
side, with any additional inputs overlaid. Selecting
PARADE displays the input channel(s) last selected
for PARADE, allowing a custom configuration of
inputs. In PARADE mode, the LINE/FIELD button
offers only two choices: one line and one field.
2-6
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At A Glance
OVERLAY
OVERLAY provides an overlaid display of all se-
lected inputs.
MENU
Push the desired menu button to enter that menu and enable
the associated functions. Push the button again to exit the
menu and disable the function. Refer to page 3-5 for more
information about using menus.
H
FILTER allows choice of flat or filtered display of the
waveform signal.
H
CURSOR enables timing cursors, voltage cursors,
and markers for the waveform display. Polar cursors
and markers are available for the vector display.
H
H
LIN SEL allows the selection of a single line or group
of lines for display.
PRESET allows the user to store and recall up to 9
front-panel setups. One additional recall is factory
pre-programmed. Presets one through eight can also
be accessed remotely.
H
CONFIG allows the user to configure several operat-
ing parameters, such as input coupling, dc restorer
speed, and internal reference designation.
H
H
H
GAIN provides selection of X1, X5, X10, and variable
gain.
CRT menu allows adjustment of CRT focus, signal
intensity, and trace rotation.
CLEAR MENU turns off the selection portions of the
menu readout. When CLEAR MENU has been used to
clear a menu readout, push the menu button once to
reinstate the readout, and once again to exit the
menu.
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At A Glance
Rear-Panel Connectors
The following is an overview of rear-panel connectors.
Figure 2-4 shows the 1750A rear panel.
Loop-Through Inputs
H
INPUTs A, A1, A2, A3, B, B1, B2, and B3 are passive
loop-through video inputs, compensated for 75 Ω.
The front-panel INPUT switch settings determine
which channel(s) are displayed. The eight inputs can
be configured for composite or component video
signals.
H
EXT REF is a 75 Ω compensated loop-through
synchronization input. Internal or external reference
is selected through the front-panel REF EXT switch;
the LED lights to show when external is selected.
The instrument will operate from external references
of composite video or black burst.
Outputs
H
PIX OUT is a 75 Ω compensated output of the video
signal selected by the front-panel INPUT switches.
This signal has bright-up in LINE SELECT mode, and
is used to drive a picture monitor. PIX OUT strobe is
not present below line 11.
Multi-Pin Connectors
H
REMOTE is a 25-pin subminiature D-type connector
which uses TTL signal or ground closures to provide
remote control of many front-panel functions. For
more information, see page 3-25 and page B-1.
H
RS232 is a 9-pin subminiature ‘D-type connector that
provides a serial interface for remote control. The
RS232 interface is not supported at the time of this
writing.
2-8
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At A Glance
Fuse
H
The instrument’s mains fuse should be replaced only
with a 250V, 2A, F-type cartridge fuse. A replace-
ment fuse is included with the instrument.
AC Power
H
The AC POWER plug is a standard ac plug receptacle
for 120 or 240 Vac power mains. The plug is
compatible with any of the power cord options
available with the 1740A/1750A-Series.
Fan Filter
H
Four replacement air filters for the fan are included
with the instrument. Refer to page C-1 for replace-
ment and cleaning instructions.
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At A Glance
Figure 2-4. 1740A/1750A---Series Rear Panel.
2-10
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Operator’s Checkout
Procedure
Before proceeding, read At A Glance starting on page 2-1.
This procedure is designed for operator familiarization and
for checking basic instrument operation (not measurement
quantities or specifications). All illustrations are of the
1750A unless otherwise noted.
If performing this procedure reveals improper instrument
operation, first check the operation of the associated equip-
ment. If the associated equipment is operating normally,
refer the 1740A/1750A-Series to qualified service personnel
for repair or adjustment.
Required Equipment
The following equipment is required to perform this proce-
dure:
1. Television Signal Generator with:
Composite Color Bars
For example: TEKTRONIX TSG 130 Series Signal
Generator.
2. Coaxial Cable, 75Ω (5)
For example: 42-inch RG59U (Tektronix Part No.
012-0159-00)
3. 75Ω Terminators, End-line (4)
For example: (Tektronix Part No. 011-0102-00)
Initial Equipment Connections
H
Connect the 1740A/1750A-Series to an appropriate AC
power source.
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Operator’s Checkout Procedure
H
Connect the generator NTSC output (COMPOSITE for
TSG131) to the CH-A input. Connect the CH-A loop-
through to the EXT REF input and connect a 75Ω
terminator to the EXT REF loop-through. See
Figure 2-5.
R-Y B-Y
NTSC
NTSC
Y
Y
TSG 130
A3
A2
B2
A1
B1
A
B
EXT
REF
B3
1750A
Figure 2-5. Equipment hook-up for Operator’s Checkout Procedure.
Procedure
1. Initialize the Front-Panel Controls
Enter the PRESET menu and select FACTORY. Press the bezel
button corresponding to RECALL. The front-panel controls
are now set to the factory preset (described on page 3-16),
and the PRESET menu is automatically exited. Notice that the
instrument is in the WAVEFORM display mode with the CH-A
INPUT displayed in two-line sweep.
2. Adjust the Display
Use the VERT POS and HORIZ POS controls to center the
display.
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Operator’s Checkout Procedure
Enter the CRT menu. DISPLAY will be outlined. Adjust the
bezel controls for optimum focus, graticule scale illumina-
tion, and signal intensity. Select READOUT and adjust the
right bezel control for desired readout intensity. Select
TRACE and adjust the center bezel control for a level trace.
Exit the CRT menu. The changes made while in the menu
remain in effect.
3. Input Channel Selection
Press the EXT and PARADE buttons. Check that CH-A, CH-A1,
CH-A2, and CH-A3 inputs are selected.
The CH-A signal should appear on the left side of the CRT.
Move the generator signal (and EXT REF cable) to CH-A1.
The display should move to the right. Repeat this step until
the signal is connected to CH-A3 and the display is at the far
right-hand side of the screen.
Change the input selections to CH-B, CH-B1, CH-B2, and
CH-B3. Repeat the process of moving the generator signal.
4. Check Gain
The 1740A/1750A-Series internal calibrator can be used to
check instrument calibration. Select CH-A input and set the
generator for NTSC Color Bars output.
Enter the configuration menu and select CALIBRATE. Turn on
the calibrator signal and note that the amplitude is 140 IRE
(1.0 V PAL), with one cycle per division. See Figure 2-6.
Select VECTOR display mode. Note that the calibrator signal
overlays the compass rose. Return to WAVEFORM display
mode.
Exit the configuration menu. Note that the calibrator signal
is automatically turned off. (For more information on using
the calibrator signal, see page 3-21 and page 4-17.)
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Operator’s Checkout Procedure
10ꢀS/DIV
Figure 2-6. Calibrator display.
5. Gain Control
There are three calibrated vertical gain settings available (X1,
X5, and X10), as well as an independent variable gain control.
Enter the GAIN menu and select X5. Note that X5 is outlined
and the display is amplified. Select X10. Note that X10 is
outlined and the display is amplified again.
Select variable gain and use the right bezel control to adjust
the gain to the minimum and maximum settings.
Exit the GAIN menu, then enter it again. Note that the vari-
able and X10 gain settings are restored. Exit the GAIN menu.
Adjust the VERT POS control to place the signal on baseline.
6. Select Timing Reference
The factory preset selects a two-line sweep. Note that
pressing the LINE/BUTTON button will cycle through four
selections: one-line, two-line, one-field, and two-field
sweeps. Return to the two-line sweep.
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Operator’s Checkout Procedure
Press the MAG button. The MAG indicator lights and a
1 ꢀS/Div sweep is displayed. Use the HORIZ POS control to
view the magnified display, then turn off the MAG. (See page
3-4 for a list of sweep rates.)
7. Voltage and Timing Cursors
The 1740A/1750A-Series voltage, timing, and vector
cursors can be used to measure any portion of the displayed
signal.
Enter the CURSOR menu (factory preset selects voltage
cursors; VOLT is outlined on screen). The voltage cursors
appear as two dashed horizontal lines: cursor 1 has single
dashes and cursor 2 has double dashes. Use the left and
center bezel controls to adjust the cursors individually, or the
right control to move both cursors by the same amount
(TRACK). The voltage difference between the cursors is
displayed as ∆V. Align a voltage cursor with a signal refer-
ence point and press MAG. The cursor is still at the same
point on the signal (use the HORIZ POS control if needed to
view the cursor).
Select timing cursors (TIME). The timing cursors appear as
two vertical dashed lines: cursor 1 has single dashes and
cursor 2 has double dashes. The time difference between
them is displayed as ∆T. Select voltage and timing cursors
together (V+T). Note that when CONTROL is set to TIME, the
three bezel controls adjust timing cursors; when set to VOLT,
they adjust voltage cursors.
Select markers (MARK). The markers appear as three dashed
lines; marker 1 has long single dashes, marker 2 has double
dashes, and marker 3 has short dashes. Use the three bezel
controls to position the markers to a reference point on the
etched graticule (such as peak white, baseline, and sync tip).
Select X5 gain and notice that the markers do not move.
These markers can be used to highlight desired features of
the waveform graticule.
Turn off the GAIN menu, then press the CURSOR button.
Select VECTOR display mode. The vector cursor menu is
displayed (POLAR has been selected by the factory preset).
The polar cursor appears as cross hairs. Use the left bezel
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Operator’s Checkout Procedure
control to move the cursor away from graticule center, and
the center bezel control to move the cursor around the grati-
cule center point. Note that the amplitude and phase of the
cursor are displayed on screen.
Select MARK and set QUANTITY to 2. Move the marker by
rotating the AMPLITUDE knob. Note that the two graticule
markers appear as small numbered boxes. Set CONTROL to 1
and use the left bezel control to move marker 1 away from
the graticule center. Use the center control to move the
marker around the graticule center point. Change CONTROL
to 2. Use the bezel controls as for marker 1. Select X5 gain
and note that the markers do not move. These markers can
be used to highlight desired features of the vector graticule.
Return to WAVEFORM display mode.
Exit the CURSOR menu, then enter the menu again. Note
that MARK is still selected and marker positions are un-
changed. Exit the menu. (For more information about using
the cursors, see page 3-8.)
8. Filter Selection
The 1740A/1750A-Series offers several filter selections for
the waveform display.
Ensure that the instrument is operating in waveform mode.
Enter the FILTER menu (FLAT is selected by the factory
preset). Select LUM filter. This provides a low-pass-filtered
display of the luminance portion of the signal. See
Figure 2-7.
Select CHROM. This provides a bandpass-filtered display of
the chrominance portion of the signal. See Figure 2-8.
Select F+L (FLAT plus LUM). The flat display is superimposed
on the luminance-filtered display (overlay is selected by the
factory preset). Press the appropriate bezel button (not the
front-panel PARADE button) to select parade. The flat display
is now on the left, followed by the luminance-filtered display.
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Operator’s Checkout Procedure
10ꢀS/DIV
FLAT
LUM
CHROM
DIFF
R--Y
SCH R--Y
F+L
F+L+C
Figure 2-7. Two-Line LUM filter display of color bar signal.
10ꢀS/DIV
FLAT
LUM
CHROM
DIFF
R--Y
SCH R--Y
F+L
F+L+C
Figure 2-8. Two-Line CHROM filter display of color bar signal.
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Operator’s Checkout Procedure
Select F+L+C (FLAT plus LUM plus CHROM). The display is
similar to the F+L display, with the chrominance-filtered
signal added on the right.
Select DIFF. Select the generator 5-step staircase signal. The
differentiated-step filtered display appears similar to
Figure 2-9.
Select R --- Y. This provides a demodulated chrominance-ver-
sus-time display. Use the right bezel control to adjust vector
phase. See Figure 2-10.
Select S CH R --- Y (1750A only). This provides a demodulated
SC/H sync-locked oscillator display, useful for viewing SC/H
variations versus time. A sample NTSC display is shown in
Figure 2-11. NTSC signals can be viewed in either line or
field sweeps. For PAL applications, view the signal in
two-field sweep (see Figure 2-12). Use the right bezel control
to adjust vector phase.
Exit the FILTER menu. Enter the menu again and note that the
filter selections are unchanged. Select FLAT. Exit the menu.
10ꢀS/DIV
FLAT
LUM
CHROM
DIFF
R--Y
SCH R--Y
F+L
F+L+C
Figure 2-9. Two-Line DIFF filter display of 5-step staircase signal.
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Operator’s Checkout Procedure
FLAT
LUM
CHROM
DIFF
R--Y
SCH R--Y
F+L
F+L+C
VECTOR PHASE
Figure 2-10. Two-Line R---Y display of color bar signal.
FLAT
LUM
CHROM
DIFF
R--Y
SCH R--Y
F+L
F+L+C
VECTOR PHASE
Figure 2-11. Two-Field SC/H R---Y display (NTSC), showing proper SCH phase.
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Operator’s Checkout Procedure
Figure 2-12. Two-Field SC/H R---Y display (PAL), showing proper SCH phase.
9. Line Selection
Line select is available in the following display modes:
WAVEFORM, VECTOR, SCH (1750A-Series only), and PIC-
TURE. Enter the LINE SELECT menu and turn the center bezel
control until the readout displays ALL 131. In a two line
display, line 131 appears on the left, followed by line 132.
Select 2 FIELD sweep and note the intensified line in each
field. Select 15H and note that 15 lines are now intensified in
each field (intensified portion appears wider). The readout is
now ALL 131---- 145. See Figure 2-13.
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Operator’s Checkout Procedure
ALL131
-- -- 1 4 5
FIELD
ALL 1OF2
1OF4 1OF8
1H
15H
LINE SEL
Figure 2-13. Line Select display with 15H selected, in 2 FIELD sweep.
Select 1 of2. Now only the first field has intensified lines,
and a NEXT FIELD selection appears. Select NEXT FIELD and
note that the intensified lines now appear only in the second
field and the readout is F2 131 F2 145.
Select MULTIPLE with WAVEFORM, VECTOR, and SCH (1750A-
Series only). Note that the displays appear in the order listed
here. Exit the line select menu. Enter the menu again and
note that the user settings are saved. Exit the menu.
10. Vectorscope Display
Select VECTOR display mode. Adjust the right bezel control
to place the burst vector on the 180° graticule line. The
display should appear similar to Figure 2-14.
11. Picture Monitor Display
Select PICTURE display mode. A picture monitor display of
the selected input signal appears. This can be used to visual-
ly identify the signal source. See Figure 2-15.
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Operator’s Checkout Procedure
VECTOR PHASE
Figure 2-14. Vectorscope color bar display.
Figure 2-15. Picture mode display of color bar signal.
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Operator’s Checkout Procedure
12. Audio Display
To obtain an audio display, connect the left and right audio
signals to the rear-panel REMOTE connector as follows: +Y to
pin 8, -Y to pin 9, +X to pin 10, and -X to pin 11. Select
AUDIO display mode.
An audio signal with no phase error appears as a straight line
extending from the audio box in the upper right corner of the
graticule to the box in the lower left. A signal with phase
error appears as an opening in a lissajous waveform. See
Figure 2-16.
13. SCH Display (1750A Only)
The SCH display mode provides a vector display of the
subcarrier-to-horizontal-sync phase relationship. (SCH
measurements appear on page 4-10.)
For NTSC operation, verify that REF is set to internal, then
select SCH display mode. This provides a dual-dot display, as
shown in Figure 2-17. Select EXT REF. This provides the
single-dot display, shown in Figure 2-18.
For PAL operation, the REF selection does not affect the
display. A sample PAL display is shown in Figure 2-18.
Figure 2-16. Audio display with phase error.
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Operator’s Checkout Procedure
VECTOR PHASE
Figure 2-17. NTSC SC/H display with internal reference selected.
Figure 2-18. PAL SC/H display.
This concludes the Operator’s Checkout Procedure.
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Operation Basics
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Functional Overview
The “Functional Overview” section describes the front- and
rear-panel functions in greater detail than the “At A Glance”
section.
Display Modes
The following display types are available:
H
H
H
H
H
H
H
VECTOR
WAVEFORM
AUDIO
SCH (1750A-Series only)
PICTURE
TIME CODE
MULTIPLE displays
Vector
The vector mode presents an XY plot of demodulated chromi-
nance phase and amplitude. The angle represents chromi-
nance phase and the distance from the center represents
chrominance amplitude. A bezel control is assigned to adjust
VECTOR PHASE.
Waveform
The waveform monitor portion of the instrument provides a
voltage versus time display of the video signal. The selected
input can be displayed in one or two line, or one or two field
sweeps. In LINE SELECT mode, identified lines of any field
can be selected and displayed. Multiple inputs can be
displayed at the same time, or multiple filters can be applied
to one input for signal analysis. TIME and VOLTAGE cursors
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Functional Overview
can be activated and positioned for reference or measure-
ment. LINE SELECT is discussed on page 3-14 and CURSORS
are discussed on page 3-8.
Audio
Audio amplitude and phase is monitored using a calibrated
X/Y Lissajous display. The operator can verify that the
program audio will be properly reproduced on both monaural
and stereo receivers. Correct phasing between two audio
channels is quickly verified by the direction of the display.
SCH
SCH provides a vector display of the subcarrier-to-horizontal-
sync phase relationship. The burst vector and the phase of
the 50% point of the leading edge of sync are displayed.
Subcarrier-to-horizontal phase and color framing are dis-
played graphically in the polar SCH display. Sync jitter over
the field is displayed as a moving sync vector dot. Correct
color framing can be verified by the position of the single
sync vector dot, relative to the color subcarrier vector when
the monitor is externally referenced.
The SCH phase of the reference signal is separately sensed to
allow reliable color framing comparison. Using this method
of determining relative color framing eliminates the require-
ment for a precise horizontal timing match between the
reference and measured signals. An external color-field
identification input is also required.
Picture
The PICTURE mode allows the operator to verify the signal
source. In PICTURE mode with LINE SELECT on, a bright-up
marker identifies the selected line in the picture.
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Functional Overview
Time Code
Longitudinal time code is monitored in a frame-rate display
to allow observation of amplitude, synchronization, and
phase with respect to reference vertical sync. Synchroniza-
tion is confirmed by the stationary display and time code
phase is determined by horizontal position of the time code
sync word on the CRT.
Multiple
When MULTIPLE is pushed, any combination of front-panel
DISPLAY modes can be selected at the same time, with the
exception of TIME CODE and PICTURE displays.
With MULTIPLE selected, the SCH/AUDIO switch sequences
through SCH, AUDIO, and both. If waveform or vector is also
selected, the switch will also sequence to OFF. (At least one
mode must be on at all times.)
When exiting MULTIPLE, the instrument will return to the
previous (non-MULTIPLE) display settings. When entering
MULTIPLE again, the previous MULTIPLE display settings will
be restored.
Displaying a Signal
Inputs
There are eight rear-panel loop-through inputs, which may
eliminate the need for an external routing switcher. The in-
puts can be displayed singly or in combination.
Without PARADE or OVERLAY selected, only one input selec-
tion can be made at a time. Each input channel button (in-
cluding A123 / B123) toggles between A and B, and is
cancelled when another input button is pressed.
With PARADE or OVERLAY selected, the input channels can be
displayed in combination. Pushing an input channel button
sequences through the labeled channels, both, then off. Push-
ing another input button does not cancel the current selec-
tion, but adds to it. To return to “single input” operation,
push the PARADE / OVERLAY button until it is off (LED is no
longer lighted).
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Functional Overview
Inputs A1, A2, A3, and B1, B2, B3 are designed to be used as
three-wire inputs for component signals.
A123 / B123
Selecting A123 provides a side-by-side display of the CH-A1,
CH-A2, and CH-A3 inputs (B123 displays the CH-B1, CH-B2, and
CH-B3 inputs). This is designed for monitoring component
signals.
Parade
Selecting PARADE displays the input channels last selected
for PARADE, allowing a custom configuration of inputs. In
PARADE mode, the LINE/FIELD button offers only two choices:
one line and one field. Up to four channels can be displayed
side-by-side; additional channels are overlaid.
Overlay
OVERLAY superimposes the selected input signals. The LINE/
FIELD button remains a four-way toggle, providing one line,
two line, one field, and two field displays.
Sweep
Sweep buttons are used to select the waveform sweep rate.
LINE/FIELD toggles through four sweep rate selections: one
line, two line, one field, and two field. In PARADE mode, the
LINE/FIELD button becomes a two-way switch, toggling be-
tween line and field.
The sweep rate is displayed in the upper right corner of the
CRT (for field-rate sweeps, 1F or 2F is displayed).
The MAG button is used with LINE/FIELD to provide horizontal
magnification of each rate as follows:
H
H
H
One line magnified = 200 ns/division
Two line magnified = 1 µs/division
One field or two field magnified = approximately
X20 magnification.
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Using the Menus
General menu information here is followed by detailed
information about each menu: FILTER, CURSOR, LIN SEL,
PRESET, CONFIG, GAIN and CRT. To set instrument operating
parameters, see CONFIG and CRT menu information.
General Menu Information
Push the desired menu button to obtain an on-screen menu
readout.
Multi-Use Bezel Controls and Buttons
Menu selections appear along the right side of the screen.
Descriptive labels, when present, appear in ITALIC text. Ac-
tual selections appear in STANDARD text, with the present
selection outlined. Use the five buttons along the right side of
the CRT (referred to as bezel buttons) to change the selec-
tions.
The center three controls under the CRT are referred to as
Left, Center, and Right bezel controls. Control functions
vary with menu choice; a readout just above each active con-
trol shows its present function. These controls are used as
variable analog controls to set values such as phase, ampli-
tude, and intensity. The left control is also used to select
categories within the CONFIG menu.
Figure 3-1 shows the bezel controls and buttons.
Moving Between Menus
Selecting a second menu removes the present menu display,
but the functions typically remain active (with the menu LED
remaining lighted to show this state). To reinstate a menu
display, push that menu button again.
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Using the Menus
CRT, PRESET, and CONFIG menus will be exited completely
when another menu button is pushed.
DISPLAY
READOUT
TRACE
Bezel
Buttons
TEST
ON OFF
FOCUS
SCALE
INTENSITY
HORIZPOS
VERTPOS
CLEAR
MENU
Left
Center
Right
Bezel Controls
Figure 3-1. The CRT menu, showing bezel controls and bezel buttons.
Clear Menu
Push CLEAR MENU to clear part of the menu display, but leave
essential readout elements such as control assignments and
measurement readouts. (The menu LED remains lighted to
show this state.) Push the menu button to bring back the full
display.
CRT, PRESET, and CONFIG menus will be exited completely
when CLEAR MENU is pushed.
Exiting a Menu Function
To exit a menu function while its display is present, push that
menu button. (The menu button is functioning as an on-off
toggle switch). If the menu display is not present, but the
3-6
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Using the Menus
menu function is still in effect (LED is lighted), push the
menu button to bring back the full display, then push it again
to exit the menu.
Filter Menu (WAVEFORM Mode Only)
The FILTER menu is available for WAVEFORM mode only.
Note that the instrument must be in WAVEFORM mode to ac-
cess the R-Y displays. When the FILTER button is pushed in
WAVEFORM mode, an on-screen menu allows the following
selections. The bezel buttons are self-cancelling.
H
H
FLAT — provides flat (normal) response.
LUM — provides a low-pass response to display the
luminance portion of the composite video signal.
H
H
H
CHROM — provides bandpass response centered on
the chrominance subcarrier frequency, and displays
frequencies around the subcarrier frequency.
DIFF — is a differentiated step filter (linearity steps
are translated into impulses for amplitude compari-
son).
R--Y — selects demodulated chrominance-versus-
time display. The chrominance is demodulated on
the R-Y (V) axis when burst is lined up on the
normal axis. The VECTOR PHASE control can adjust
the demodulator phase to any axis.
H
H
SCH R--Y (1750A--Series Only) — demodulates the
SCH sync-locked oscillator. This display is useful
for viewing SCH variations versus time.
F + L — displays the video signal both flat and
luminance filtered. The display is in parade or
overlay mode, as selected through the on-screen
menu. When PARADE is selected, the flat display is
on the left.
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Using the Menus
H
F + L + C — displays the video signal flat, lumi-
nance filtered, and chrominance filtered. The signal
is displayed in parade or overlay mode, as selected
through the on-screen menu. When PARADE is
selected, the flat display is on the left, with the
chrominance-filtered display on the right.
Cursor Menu
Press the CURSOR menu button to enter the cursor menu.
Cursors are available for VECTOR, WAVEFORM, and
VECT+WFM DISPLAY modes.
Vector Cursor Control
In VECTOR display mode, a bezel button is used to select po-
lar cursors (POLAR) or markers (MARK). The polar cursor ap-
pears as crosshairs, as shown in Figure 3-2. The left bezel
control is used to adjust cursor amplitude, and the center con-
trol adjusts cursor phase. The right bezel control adjusts the
phase of the vector signal.
When Vector markers are selected, additional readouts ap-
pear, allowing the user to select the quantity of markers that
will be present (1 through 8), and which of these markers is
currently controlled by the bezel controls. The left bezel
control adjusts the amplitude of the selected marker, and the
center bezel control adjusts its phase. The right bezel control
adjusts the phase of the vector signal.
3-8
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Using the Menus
AMPL
75.0IRE
PHASE
145.0°
VEC CURSOR
POLAR
MARK
AMPLITUDE
PHASE
VECTOR PHASE
VERTPOS
HORIZPOS
CLEAR
MENU
Left
Center
Right
Figure 3-2. The VECTOR CURSOR menu.
Waveform Cursor Control
In WAVEFORM display mode, the bezel buttons are used to
select timing cursors (TIME), voltage cursors (VOLT), both
voltage and timing (V+T), or markers (MARK). The Waveform
cursor menu is shown in Figure 3-3.
H
When voltage cursors are selected (VOLT), the left
bezel control is used to adjust the vertical position
of the first voltage cursor, and the center bezel
control adjusts the second voltage cursor. The right
bezel control is used to move the vertical position of
both cursors vertically, in tandem. The readout ∆V
shows the voltage difference (positive or negative)
between the two cursor positions, up to four signifi-
cant digits.
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Using the Menus
H
When timing cursors are selected (TIME), the left
bezel control is used to adjust the horizontal position
of the first timing cursor, and the center control
adjusts the horizontal position of the second timing
cursor. The right bezel control moves both cursors
horizontally, in tandem. The readout ∆T shows the
time difference (positive or negative) between the
two cursor positions, up to four significant digits.
H
When markers are selected (MARK), the left bezel
control is used to adjust the horizontal position of
the first marker line, the center bezel control adjusts
the second marker, and right bezel control adjusts
the third marker.
H
When both voltage and timing cursors are selected
(V+T), a control assignment appears on the screen.
The bezel button is used to assign the control to
voltage or timing cursors. The bezel controls work
the same as for the individual timing and voltage
cursor modes. Both voltage and timing readouts are
present.
∆ V
700 mV
WFM CURSOR
VOLT
TIME
MARK
V+T
VOLT1
VOLT2
TRACK
VERTPOS
HORIZPOS
CLEAR
MENU
Left
Center
Right
Figure 3-3. The WAVEFORM CURSOR menu.
3-10
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Using the Menus
Voltage Cursor 1
Voltage Cursor 2
∆ V
700 mV
WFM CURSOR
VOLT
TIME
MARK
V+T
VEC CURSOR
POLAR
MARK
CONTROL
VOLT
TIME
Timing Cursor 1
Timing Cursor 2
VOLT1
VOLT2
TRACK
VERTPOS
HORIZPOS
CLEAR
MENU
Figure 3-4. The VECTOR+WFM CURSOR menu with V+T selected.
Vector + Waveform (Multiple)
If MULTIPLE is pressed and both VECTOR and WAVEFORM dis-
plays are selected, menus for all cursor types will be dis-
played. See Figure 3-4. All cursor functions are available in
this mode (the top three bezel buttons are self-cancelling).
Bezel control assignments are the same as for the individual
modes.
Using the Cursors
With Vector Display
Vector cursors are available when a composite vector display
is selected. To use vector cursors, operate in VECTOR or VEC-
TOR+WAVEFORM mode and press the CURSOR MENU button.
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Using the Menus
There are two vector cursor displays: POLAR and MARK.
(The VECTOR PHASE bezel control continues to adjust the
phase of the signal.)
Polar Cursors can be used to measure the amplitude and
phase of the chrominance signal. When POLAR is selected,
position the cursor (cross hairs) with the AMPLITUDE and
PHASE bezel controls, and view the amplitude and phase
readouts at the top of the screen. See Figure 3-2. The cursor
zero amplitude point is the center point of the graticule. Us-
ing the amplitude control to move the cursor out from the
center increases the amplitude. Adjusting the cursor phase
will rotate the cursor around the center point, with the zero
phase point being the B-Y (U) axis. The amplitude readout
can be set for mV or IRE values through the CONFIG menu,
described on page 3-18.
When the gain or position of the signal is changed, the polar
cursors maintain their relationship with the signal.
When CLEAR MENU is pressed, the POLAR / MARK choice on
the right side of the screen will be removed, but the bezel
controls will still be active and cursor measurements can still
be made. When another menu is selected, the bezel controls
may be reassigned to the new menu, but will return to cursor
control when the new menu is deselected.
Markers can be used to highlight graticule points. When
MARK is selected, two additional menu readouts appear.
These allow selection of from one to eight markers, and as-
sign the AMPLITUDE and PHASE bezel controls to one of these
markers. Markers are designed to be used for reference
points; there is no quantitative readout. Markers are posi-
tioned with respect to the graticule and are not moved or re-
sized with the signal.
When CLEAR MENU is pressed, all of the marker readout ex-
cept the boxes will be removed. The readout will be restored
when CURSOR menu is selected again. When CURSOR menu
is exited and re-entered, the selected cursor quantity and
position will be retained. One use of markers is to position
them on the vector target boxes. Adjust the signal source
until the color bar signal appears in the marker boxes.
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Using the Menus
If it becomes necessary to compensate for minor shifting of
markers due to drift or external magnetic fields (particularly
if the instrument is moved after the markers are set), enter
the CRT menu and select READOUT. Use the bezel controls to
adjust vertical position (VPOS) and horizontal position
(HPOS) until the center of the displayed test pattern is at the
center of the graticule.
With Waveform Display
Voltage Cursors can be used to make accurate signal ampli-
tude measurements. With VOLT selected, use the left bezel
control to position the VOLT1 cursor at the upper excursion of
signal to be measured, and the center bezel control to posi-
tion the VOLT2 cursor at the lower excursion. The on-screen
readout gives the voltage difference between the two levels.
When GAIN is changed, the voltage cursors maintain their
relationship with the signal. For example, if the VOLT2 cursor
were set to the signal sync tip in X1 GAIN, it would also be at
sync tip in X5 gain, X10 gain, or with VAR gain on.
Timing Cursors can be used to make accurate time measure-
ments. When TIME is selected, position the TIME1 cursor at
the left excursion of the signal to be measured, and the TIME2
cursor on the right. The on-screen readout gives the time
difference between the two points.
When MAG is selected, the timing cursors maintain their rela-
tionship with the signal. For example, if the VOLT1 cursor
were set to the rising edge of sync, it would also be set there
with MAG selected.
Markers. When MARK is selected, use the bezel controls to
vertically position the markers where desired with respect to
the graticule markings. These markers are designed to be
used for reference points; there is no amplitude readout. The
markers are not affected by GAIN changes; if a marker were
set to 100 IRE in X1 GAIN, it would still be set to 100 IRE with
the MAG on.
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Using the Menus
Line Select Menu
Pushing the LIN SEL menu button enables the line select mode
and provides the line select menu display. The middle bezel
control is assigned to select the line number. The following
choices can be made using the bezel buttons.
1740A--Series
H
H
H
FIELD — ALL or 1of 2
1H or 15H (one line or 15 lines)
NEXT FIELD — (appears only when 1of 2 FIELD is
selected.) Push the bezel button corresponding to
NEXT FIELD to sequence through the fields desig-
nated by the FIELD selection. A box flashes mo-
mentarily around the on-screen label to verify that
the selection has been made.
1750A--Series
H
H
H
FIELD — ALL or 1of2 or 1of 4 or 1of8
1H or 15H (one line or 15 lines)
NEXT FIELD — (appears only when 1of 2, 1of4, or
1of 8 FIELD is selected.) Push the bezel button
corresponding to NEXT FIELD to sequence through
the fields designated by the FIELD selection.
H
ALT 2 FIELD — (appears only when 1of 4 FIELD is
selected.) Push the bezel button corresponding to
ALT 2 FIELD to toggle between the current field and
the second next field; for example, FIELD1 and
FIELD3.
H
ALT 4 FIELD — (appears only when 1of 8 FIELD is
selected.) Push the bezel button corresponding to
ALT 4 FIELD to toggle between the current field and
the fourth next field; for example, FIELD1 and
FIELD5.
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Using the Menus
When bezel buttons corresponding to NEXT FIELD,
ALT 2 FIELD, or ALT 4 FIELD are pushed, a box flashes
momentarily around the on-screen label to verify
that the selection has been made.
Readout
The line select readout (in the upper left of the CRT) consists
of field followed by line number. When 15H is selected, the
readout also displays the range of line numbers. For exam-
ple, select FIELD 1 and 15H, and rotate the LINE SEL control to
line 34. This provides a readout of field 1, lines 34 through
48:
F1 34
F1 48
Line Select Functions
All of the other menus are functional during line select op-
eration. The line select menu display disappears when anoth-
er menu is selected, but the selected line and field are
displayed until the line select menu is exited. (The field and
line readout remains in the upper left of the screen, and the
line select LED remains lighted to indicate this state.)
Line select can also be used with MULTIPLE displays of WAVE-
FORM, VECTOR, and SCH. Selected displays appear on the
screen in the following order: WAVEFORM, VECTOR, SCH.
The readout indicates the line number of the highest priority
display. For example: with waveform and vector displays
both selected, a readout of F1:20 would indicate that field 1,
line 20 is displayed in waveform mode, and field 1, line 21 is
displayed in vector mode.
In a waveform display, the selected line is displayed first in a
two-line sweep, and brightened in a field sweep.
When line select is enabled, the rear-panel PIX MON output
highlights the selected line on the picture monitor display.
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Using the Menus
Preset Menu
The 1740A/1750A-Series has 10 presets capable of storing
front-panel setups. Nine of the presets are user-program-
mable and one is factory pre-programmed. The factory
programmed setup is as follows: WAVEFORM, CH-A, DC REST
ON, 2LINE SWEEP, REF internal, and menus off.
Factory-programmed setup: WAVEFORM DISPLAY, CH-A
INPUT, DC REST ON, 10 µs SWEEP, REF internal, and menus
off.
Push the PRESET menu button to access the on-screen menu,
illustrated in Figure 3-5. Turn the left bezel control to select
the PRESET location to be acted on (presets 1-9 are available
through the menu). Next, use the bezel button corresponding
to the desired action (RECALL, STORE, RENAME, or RECOV-
ER). When a bezel button is pushed, a box flashes momen-
tarily around the on-screen label to verify that the selection
has been made.
RECALL
STORE
PRESET 1
Bezel
Buttons
PRESET 2
RENAME
PRESET 3
PRESET 4
PRESET 5
PRESET 6
PRESET 7
PRESET 8
PRESET 9
FACTORY
RECOVER
VERTPOS
HORIZPOS
CLEAR
MENU
Left
Center
Right
Figure 3-5. The PRESET menu display.
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Using the Menus
Recall
Use the left bezel control to select (outline) a preset for re-
call. Push RECALL to recall the stored instrument configura-
tion.
Recover
Push RECOVER to restore the front-panel setup that was in
effect before RECALL was pushed.
Store
To begin storing a setup, push STORE. Make sure the front-
panel controls are set as desired, and use the left bezel con-
trol to select the storage location (shown outlined).
Push STORE IT to store the current front-panel settings at the
outlined PRESET location. (Push the bezel button corre-
sponding to RETURN if storing is not desired. This will can-
cel and exit the STORE operation.)
Rename
Selecting RENAME will provide an on-screen display, assign-
ing the center and right bezel controls to LOCATION and LET-
TER. Turn the center control to select the letter that will be
changed (move the box to the desired location within the
preset name). Turn the right control until the selected letter
changes to the desired new letter.
Push RETURN if renaming is not desired. All changes to the
name will be cancelled.
When the change has been made satisfactorily, select AC-
CEPT to store the new name.
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Using the Menus
Configure Menu
Push the CONFIG button to display the configure menu,
shown in Figure 3-6. Turn the left bezel control to select
INPUT, VECTOR, FORMAT, STANDARD, OFFSET, CALIBRATE,
REMOTE, or REFERENCE (a box appears around the selec-
tion). Following are descriptions of each selection.
INPUT
H
H
H
COUPLING — Selects AC or DC coupling for
rear-panel inputs.
DC RESTORER — Selects the clamp speed. Slow
will clamp while displaying any hum.
CLAMP — Selects the point of the video signal that
is clamped to 0. Can be set for ST (sync tip) or BP
(back porch).
H
A123 — and B123 — When COMPOSITE is se-
lected, the instrument’s internal reference is the
input channel currently selected for display. For
COMPONENT, the internal reference is A1 when A123
is selected, and B1 when B123 is selected (sync is
present only on the first channel).
VECTOR
H
BARS — The instrument can be configured to accept
75% or 100% amplitude color bar signals. Dual-
Standard instruments allow color bar signal ampli-
tudes to be set for NTSC and for PAL operation.
H
H
SETUP — (NTSC operation only) Configures the
instrument to accept signals with or without setup.
PAL — (PAL operation only) When +V is chosen,
the phase reference of the -V lines is inverted, then
shown as an overlay on the +V lines to provide a
comparison display. +V shows +V and -V on
alternate lines.
H
TEST — Used by service personnel; refer to the
service manual.
3-18
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Using the Menus
COUPLING
AC DC
DCRESTORER
SLOW
FAST
CLAMP
Bezel
Buttons
ST
BP
INPUT
VECTOR
A123
FORMAT
COMPOSITE
COMPONENT
STANDARD
OFFSET
B123
CALIBRATE
REMOTE
REFERENCE
COMPOSITE
COMPONENT
VERTPOS
HORIZPOS
CLEAR
MENU
Left
Center
Right
Figure 3-6. The CONFIGURE menu display with INPUT selected.
FORMAT
H
CONFIG—FORMAT is used to to select the configura-
tion of signals used for interconnection of equip-
ment. Available signal formats are: GBR,
SMPTE/EBU, BETA, and MII. When viewed as a
waveform parade display, GBR signals can be
displayed in either GBR sequence or RGB sequence,
as selected through the GBR PARADE GBR/RGB
menu. Table 3-1 shows valid format selections.
H
CONFIG—FORMAT is also used to select LIGHTNING
or DIAMOND. The present selection will be dis-
played when the front-panel LIGHTNING button is
pressed.
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Using the Menus
Table 3 -1. Valid FORMAT selections.
[1]
[2]
SETUP
FORMAT
525/60
BARS
Y
N
75% 100%
GBR
• •
• •
• •
• •
•
•
•
SMPTE / EBU
BETA
•
•
MII
Y
N
625/50
75% 100%
GBR
• •
• •
• •
• •
•
•
•
•
SMPTE / EBU
BETA
[3]
MII
[1]
75% or 100% Bars selected through CONFIG—VECTOR menu.
[2]
[3]
Setup Yes or No is selected through the CONFIG—VECTOR
menu. The setup selection is only relevant with 525/60 BETA,
and is ignored in all other formats.
MII is identical to SMPTE/EBU in 625/50.
STANDARD
H
CONFIG—STANDARD allows the user to set the cursor
unit of measure to MV, IRE, or AUTO. When AUTO is
selected, cursor units are automatically changed to
IRE when operating in the NTSC standard, and MV
when operating in the PAL standard.
H
For dual-standard instruments, a menu selection of
NTSC, PAL, or AUTO standard is also available.
When AUTO is selected, the operating standard is
changes automatically to match the standard of the
displayed input signal. A circled “A” precedes
NTSC or PAL on the readout.
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Using the Menus
OFFSET
H
The VERTICAL POSITION control normally positions
all channels together. When OFFSET is enabled, the
bezel controls can be used to offset input channels 2
(A or B) and 3 (A or B) with respect to channel 1 (A
or B).
H
While the offsets are enabled, the VERTICAL POSI-
TION control will still position all channels together,
with the offset amount remaining constant. When
OFFSET is turned off, the input channels will be
re-aligned. The selected offset amount will be
recalled the next time OFFSET is enabled.
H
When A2A3 OFFSET is on, the center and right bezel
controls are assigned to CH A2 and CH A3 offsets.
On-screen labels appear just above each control.
Turning these controls will offset the CH A2 and CH
A3 signals with respect to CH A1. When B2B3 offset
is on, the same two controls are assigned to CH B2
and CH B3.
H
When both A2A3 and B2B3 offsets are on, the user
assigns the controls to either A or B offsets. The
CONTROL selection only appears when both A and B
OFFSETS are selected.
H
An offset will remain in effect until the user turns
the offset OFF. (Exiting the CONFIG menu will not
affect the OFFSET ON / OFF setting.)
CALIBRATE
These choices are offered when CALIBRATE is selected:
H
H
CAL SIG — Turns the 1 V internal calibrator signal
on/off.
GAIN CAL — Turns on the gain calibration adjust-
ment on/off.
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Using the Menus
Additional choices appear when CAL SIG or GAIN CAL is
turned on:
CAL SIG ON
H
In waveform mode, the user can set the calibrator
frequency to 100 KHZ or to FSC OSC (FSC OSC =
3.58 MHz for NTSC/4.43 MHz for PAL). Dual-stan-
dard monitors also have the option of choosing
NTSC FSC (3.58 MHz) or PAL FSC (4.43 MHz).
H
H
In vector mode, the user can set the calibrator
frequency, for dual-standard instruments only, to
NTSC FSC (3.58 MHz) or PAL FSC (4.43 MHz).
In both waveform and vector modes, selecting NTSC
FSC or PAL FSC temporarily switches the instrument
to the appropriate video standard. The standard is
restored when changing the selection or when
exiting the CALIBRATE menu.
GAIN CAL ON
H
In waveform mode, the left bezel control adjusts
instrument vertical gain (V CAL) and the center bezel
control adjusts instrument horizontal gain (H CAL).
Once gain has been adjusted, two reset options
appear on screen. If either of these resets is se-
lected, a box flashes momentarily around the on-
screen label to acknowledge that reset has occurred.
RESET VCAL cancels any vertical gain adjustments
and RESET VCALcancels any vertical gain adjust-
ments; the instrument returns to the factory cali-
brated gain settings.
H
In vector mode, the center bezel control adjusts the
vector signal gain. Once gain has been adjusted,
RESET VCAL appears on screen. Selecting RESET
VCAL cancels any vector gain adjustments and
returns the instrument to the factory calibrated gain
settings.
3-22
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Using the Menus
REMOTE
H
The currently operating software version is dis-
played in the lower right corner of the screen.
H
Three menu choices are available. REM INPUT
configures rear-panel REMOTE connector pin 3 to
accept External Horizontal or Staircase input.
STAIRCASE configures the staircase input for 3-step
(RGB) or 4-step (YRGB) signal. BAUD configures
the data transmission rate for the rear-panel RS232
connector for 1200, 4800, or 9600 baud.
H
The remote input is enabled by a TTL low or switch
to ground. See page B-1.
REFERENCE (Dual Standard Only)
H
NTSC external reference and PAL external refer-
ence can be set to EXT, A, A1, A2, A3, B, B1, B2,
or B3.
H
When The front-panel REF EXT is selected (LED
lights) the instrument uses the rear-panel EXT REF
input. Dual-standard monitors can be configured for
two external references; one for NTSC and one for
PAL. Any of the input channels can be designated
as a second external reference by selecting that input
channel as the NTSC EXT REF or PAL EXT REF
through this menu.
H
If NTSC and PAL external references are configured
the same, the monitor automatically operates in the
same television standard as the EXT REF input.
When NTSC and PAL external references are
configured differently, the monitor’s operating
standard is determined by the standard of the dis-
played video instead of the EXT REF input. Once the
operating standard is determined, the monitor
immediately switches to the appropriate input for
reference timing.
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Using the Menus
Gain Menu
H
Any one of three calibrated gain ratios can be selected:
X1, X5, or X10. Variable gain is also available, indepen-
dent of the other gain settings. When variable gain is on,
the left bezel control adjusts the signal gain.
H
Audio or Time Code gain is set from the GAIN menu
when AUDIO or TIME CODE display is selected. Gain
choices are 0 dBu, 4 dBu, 8 dBu, or 12 dBu. Select gain
relative to the system under test.
H
When variable gain is turned off, the instrument returns
to the calibrated gain setting. Operator adjustments
made with variable gain will be restored when variable
gain is selected again.
CRT Menu
H
DISPLAY is used for signal and etched graticule adjust-
ments. When DISPLAY is selected, the left bezel control
adjusts the signal focus (FOCUS), the center bezel
control adjusts the etched graticule illumination (SCALE)
and the right bezel control adjusts the signal intensity
(INTENSITY).
H
READOUT refers to electronic graticules, markers, menu
and measurement readouts. When READOUT is selected,
a test pattern containing a vertical line and a horizontal
line is displayed. Use the left bezel control (VPOS) and
the center bezel control (HPOS) until the lines cross at
the center of the etched graticule. This will compensate
for minor shifting of markers due to drift or external
magnetic fields (particularly if the instrument is moved
after the markers are set).
The right bezel control adjusts readout intensity (INTEN-
SITY). Readout intensity will not go below the calibrated
minimum value when menus are displayed.
H
TRACE adjusts trace rotation
Exiting the menu will return the instrument to normal opera-
tion, with the new settings in effect.
3-24
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Remote Operation
The 25-pin rear-panel REMOTE connector is a subminiature
D-type connector. It accepts the input for RGB/YRGB stair-
case, external horizontal, remote sync external blanking, time
code, and Left and Right audio. TTL signal or ground clo-
sure to designated pins will enable Staircase, External Hori-
zontal, or Remote Sync displays.
When Remote Sync is enabled, the on-screen TIME/DIV. read-
out is not present. When Remote Sync or External Horizon-
tal is enabled with timing cursors, “UNCAL” is displayed in
place of a quantitative readout.
The REMOTE connector is configured for Staircase (RGB or
YRGB) or External Horizontal input through the CONFIGURE
menu, shown on page 3-18.
The user can store and recall up to eight front-panel setups
through the remote. Remote connector pin assignments and
an operational description begin on page B-1.
Using Presets through the Remote
The 1740A/1750A-Series has 10 presets capable of storing
front-panel setups. Presets one through eight are accessible
through the rear-panel REMOTE connector. A TTL low or
ground closure on one of the PRESET pins selects the front-
panel setup stored at that preset location.
When STORE (pin 25) is grounded along with one of the pre-
set pins, the current front-panel setup is stored at the selected
preset location.
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Making
Measurements
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Basic Measurements
Basic Measurements contains 1740A/1750A-Series graticule
descriptions, followed by specific measurement procedures.
This monitor uses an internal graticule, which combines wa-
veform and vector markings. The internal graticule scales
are on the same plane as the CRT phosphor, eliminating par-
allax errors. Graticule illumination can be adjusted through
the CRT menu (page 3-24) to provide optimum brightness for
viewing or photographing displays.
Waveform Graticule
There are three versions of the waveform graticule, illus-
trated in Figure 4-1, Figure 4-2, and Figure 4-3:
H
NTSC composite video graticule (1740A and 1750A
only)
H
H
CCIR composite graticule (1741A and 1751A only)
Dual standard graticule (1745A and 1755A only)
Horizontal Scale
The 0 IRE (0.3V) graticule line is divided into 12 major divi-
sions. Each division represents a unit of time determined by
the SWEEP and MAG settings. Line sweep rates are as fol-
lows:
MAG ON
SWEEP
TIME/DIV
5 µS/Div
1 LINE SWEEP
2 LINE SWEEP
200 nS/Div
10 µS/Div
1 µS/Div
In 2 FIELD SWEEP with MAG ON, the entire vertical interval
can be viewed.
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Basic Measurements
NTSC Vertical Scales
The NTSC graticule is shown in Figure 4-1. The left side of
the graticule is scaled in IRE units and extends from -50 to
+120 IRE in 10 IRE increments. A mV scale has been added
to the right side of the NTSC graticule to facilitate compo-
nent measurements.
Black level setup is denoted by a dashed line at 7.5 IRE.
There are 2 IRE and 4 IRE markings at the center of the
-40 IRE line to assist in measuring sync amplitude. This
scale is designed for use with two line or two field sweep
rates.
The graticules are also marked for K-Factor tolerances and
linear-distortion measurements. These measurements will be
described later in this section.
Audio
K Factor
100% White
Level
75% White
Level
Baseline
Sync Tip
Setup
Figure 4-1. NTSC waveform/vector graticule.
4-2
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Basic Measurements
PAL Vertical Scale
The PAL graticule is shown in Figure 4-2. On the left side of
the PAL graticule is a voltage scale that extends from 0 to
1.2 V. The graticules are also marked for K-Factor toler-
ances and linear-distortion measurements. These measure-
ments will be described later in this section.
Component signals can be centered on the .35 V line.
Audio
K Factor
100% White
Level
Baseline
Sync Tip
Figure 4-2. PAL waveform/vector graticule.
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Basic Measurements
Dual-Standard Vertical Scale
The dual-standard graticule combines the NTSC and PAL
scales. The NTSC scale is on the left side; the PAL scale is
on the right. The divisions represent 10 IRE in amplitude (70
mV for PAL). The instrument gain is automatically adjusted
for the particular standard used. On-screen arrows point to
the graticule scale (left side or right side) that is calibrated
for the present operating mode.
Audio
K Factor
100% White
Level
75% White
Level
Baseline
Sync Tip
Setup
NTSC Scale
PAL Scale
Figure 4-3. Dual Standard waveform/vector graticule.
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Basic Measurements
Making Waveform Measurements
Horizontal Sync Amplitude
The vertical scale at sync tip (40 IRE NTSC or -0.3 V PAL)
provides 2 and 4 IRE ( 2 and 4 mV) for measuring sync
amplitude. Align the blanking level of a centered two-line
waveform display on the graticule baseline to place the sync
pulse directly over this structure. Measure sync amplitude
directly from the graticule, or use the voltage cursors.
Peak White
With the blanking signal level on the graticule baseline, the
amplitude of the 100% white reference of a color bar should
be on the 100 IRE (1 V) graticule line. With a 2 LINE sweep
rate, use the HORIZ POS control to place the white reference
directly over the amplitude scale at graticule center. The
vertical markings there correspond to 2 IRE/division (10 mV/
division for PAL). Measure peak white directly from the
graticule or use the voltage cursors.
K-Factor Measurements
The boxed area in the upper left corner of the graticule is
scaled for 2% and 4% K-Factor ratings for precise tilt mea-
surements. This structure is designed to work with an 8 µs
half-amplitude duration (HAD) bar. The bar tilt measure-
ment structure can also be used to measure pulse-to-bar ratio.
Calibrated X5 GAIN can be used while making these measure-
ments; it increases resolution to 0.4% and 0.8%.
To use the NTSC vertical scale to make line-time distortion
and pulse-to-bar ratio measurements, position the signal
blanking level to the graticule baseline. Next, position the
center of the composite test signal bar to the center of the 2T
bar measurement box and check to see if insertion gain is
unity. If it is not, adjust the VARIABLE GAIN (enabled from the
GAIN MENU) for exactly 100 IRE (700 mV PAL) of signal
amplitude from baseline to the middle of the white bar.
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Basic Measurements
To measure the K-- Factor line-time distortion, measure the
largest deviation of the bar top (tilt or rounding) within the
structure. The solid outer box equals a 4% K-Factor, while
the dashed line inner box equals a 2% K-Factor. For signals
with a bar half-amplitude duration that exceeds 18 ꢀs (8 ꢀs
PAL), measure the bar top in increments by positioning the
bar to the left or right of the leading or trailing edge. The
first and last 1 ꢀs of the bar should be disregarded.
Pulse-to-bar K-Factor measurements are made by normaliz-
ing bar amplitude (100 IRE or 1V) and adjusting the HORIZ
POS control to position the pulse on the line-time distortion
structure. Use the VAR GAIN (see CONFIG—GAIN menu, page
3-24) to adjust signal amplitude.
Make sure that the center of the bar is at 100 IRE (1 Volt
PAL) when blanking level is at 0 IRE (use VARIABLE GAIN to
adjust gain, if necessary). Use the HORIZ POS control to
place the 2T pulse over the center of the boxed measurement
area and measure its amplitude. When the top of the pulse
falls within the dashed lines, the K-Factor equals 2% or less.
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Basic Measurements
Vector Graticule
The VECTOR display permits measurements of hue in terms
of the relative phase of the chrominance signal with respect
to the color burst. Relative amplitude of chrominance to
burst is expressed in terms of the displacement from center
(radial dimension of amplitude).
The vector graticule is combined with the waveform grati-
cule.
The NTSC and PAL vector graticules contain burst and vec-
tor targets; the dual-standard graticules contain burst and
vector targets for both NTSC and PAL standards. The vector
targets can be used with either 75% or 100% amplitude color
bar signals. The selection is made through the CONFIG—VEC-
TOR menu, described on page 3-18.
NTSC
The chrominance vectors terminate in a system of graticule
targets consisting of two boxes (a small box inside a large
box). A sample target is shown in Figure 4-4. The dimen-
sions of the large boxes represent 10° centered on the ex-
act chrominance phase, and 20% of chrominance
amplitude centered around standard amplitude. The dimen-
sions of the smaller boxes represent 2.5° and 2.5 IRE.
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Basic Measurements
R
°
°
°
°
°
°
°
°
Figure 4-4. Vector targets --- NTSC values (PAL values in parentheses).
PAL
For the 1741A and 1751A graticule, each PAL chrominance
vector related to the +V burst terminates in targets consisting
of two boxes (a small box inside a large box). See
Figure 4-4. The large box represents 10° centered on the
exact chrominance phase and 20% of chrominance ampli-
tude centered around 100% standard amplitude. The dimen-
sions of the inner target show 3° and 5% of chrominance
amplitude; the vectors associated with the -V burst terminate
in the smaller targets.
Dual-Standard
The 1745 and 1755 graticule is a composite of the PAL and
NTSC graticules. There are two inner targets within the
larger target; the PAL target, and the NTSC target. The
NTSC target is inside the PAL target.
4-8
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Basic Measurements
Making Vector Measurements
Chroma Bandwidth
The horizontal and vertical axes of the vector graticule
contain markings for checking chroma bandwidth. A subcar-
rier frequency sine wave (whose amplitude places it on the
outer compass rose) is used as a reference. When the fre-
quency is changed, the diameter of the circle should reduce.
At a point equal to 70% of full amplitude (-3 dB), there are
gaps in the horizontal and vertical axes. This calibration aid
makes it possible to check the -3 dB points of the demodula-
tor output amplifiers.
Differential Phase and Gain
Differential gain (dG) and differential phase (d∅) measure-
ments use the graticule markings located at the outer edge of
the B-Y or U axis. See Figure 4-5.
o
dφ
10
2°
dφ
Figure 4-5. Differential Gain and Phase Measurements.
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Basic Measurements
Making SC/H Phase Measurements
(1750A---Series Only)
The SC/H display provides a vector display of the subcarrier-
to-horizontal-sync phase relationship. The burst vector and
the phase of the 50% point of the leading edge of sync are
displayed.
NTSC
Dual-Dot Display
When REF is set to internal, the 1750A has a dual-dot SC/H
display (Figure 4-6). The dots represent the 50% points of
horizontal sync.
To make a measurement, align the burst vector as shown in
Figure 4-6. The location of the horizontal sync dot is the
SC/H phase of the signal. With the dual dots, SC/H phase
range is limited to 180°, because the SC/H phase of a single
signal referenced to itself can only vary 90°. At 180°, the
video signal again has a + field subcarrier phase sequence,
making it “SC/H phased.”
Single-Dot Display
When REF is set to EXT, the 1750A has a single-dot display
(Figure 4-7). This relative mode allows the comparison of
two signals, the selected INPUT and EXT REF. The phase shift
between the two subcarriers can extend from 0° to 360°.
A dot near 0° (relative to burst) indicates the input is perfect-
ly SC/H-phased with the EXT REF input, and that the color
frames are properly matched. A phase reading of 180° indi-
cates that the INPUT and EXT REF color frames are not proper-
ly matched.
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Basic Measurements
Sync Dot
Burst Vector
0° Axis
Sync Dot
Relative angle indicates
degree of SC/H phase.
VECTOR PHASE
Figure 4-6. NTSC dual-dot SC/H display.
Burst Vector
0° Axis
Sync Dot
VECTOR PHASE
Figure 4-7. NTSC single-dot SC/H display.
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Basic Measurements
PAL
The 1751A uses a series of dots around the compass rose
with a single dot in a blanked area to denote sync (see
Figure 4-8). Place the burst vector at 0°, align the burst vec-
tors with the graticule markings, and read the SC/H phase
error as the amount of sync dot offset from the the horizontal
axis. The input signal and the the EXT REF signal are proper-
ly color framed when the sync dot is within 90° of the burst
vector.
Figure 4-8. PAL SC/H display.
S C / H R --- Y
SC/H phase can be viewed over a frame of video. Select
WAVEFORM display and FIELD sweep. Enter the FILTER menu
and select S C/ H R --- Y. For NTSC, stable SC/H is a horizontal
line as shown in Figure 4-10. (Figure 4-9 shows the same
display with a LINE sweep selected.) A sample SC/H phase
error is shown in Figure 4-11. The flat lines indicate that
SC/H phase is stable over the entire frame. For PAL, SC/H is
a sine wave resulting from the 25 Hz offset (Figure 4-12).
4-12
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Basic Measurements
FLAT
LUM
CHROM
DIFF
R--Y
SCH R--Y
F+L
F+L+C
Burst
Horizontal Sync
VECTOR PHASE
Figure 4-9. Two-Line SC/H R---Y display (NTSC), with proper SC/H phase.
FLAT
LUM
CHROM
DIFF
R--Y
SCH R--Y
F+L
F+L+C
VECTOR PHASE
Figure 4-10. Two-Field SC/H R---Y display (NTSC), showing proper SC/H phase.
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Basic Measurements
VECTOR PHASE
Figure 4-11. Two-Field SC/H R---Y display (NTSC), showing approximate 10°
phase error.
Figure 4-12. Two-Field SC/H R---Y display (PAL), showing proper SC/H phase.
4-14
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Basic Measurements
Making Audio Measurements
An audio signal with no phase error appears as a straight line
extending from the audio box in the upper right corner of the
graticule to the box in the lower left. A signal with phase
error appears as an opening in a Lissajous waveform.
Figure 4-13 shows three audio input signals that are equal in
amplitude, but have different phase relationships.
Audio gain is set from the GAIN menu when AUDIO display is
selected. Gain choices are 0 dBu, 4 dBu, 8 dBu, or 12 dBu.
Select gain relative to the system under test.
a. Correct Phase
b. Phase Error of 180°
c. Phase Error of approximately 30°
Figure 4-13. Audio displays.
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Basic Measurements
Time Code Display
Linear Time Code, also known as Longitudinal Time Code
(LTC), is an 80-bit signal with information which makes it
possible to accurately identify an individual frame of re-
corded video. LTC is typically recorded on an unused audio
track. The 1740A/1750A-Series monitor provides a voltage-
versus-time display of the Time Code waveform, which can
be used to check for the following problems:
H
H
No signal.
Sync word in the wrong position (improper
Time Code-to-Video sync).
H
Low amplitude or noisy time code signal.
To display the Time Code signal on the monitor, connect the
video signal containing LTC to the rear-panel REMOTE
connector as follows: pin 12 (+ input), pin 13 (- input), and
pin 14 (ground). Push the front-panel TIME CODE button.
The display should be a stable square wave.
Sync Word
The trigger point is FIELD 1 of the applied video wave-
form—either internal or external reference. When synchro-
nized to video, the display is stable. The sync word should
appear on the right. If it is missing, drifting, or in another
position, there is a problem with the Time Code-to-Video
synchronization.
Amplitude
Time code gain is set from the GAIN MENU when TIME CODE
display is selected. Gain choices are 0 dBu, 4 dBu, 8 dBu, or
12 dBu. Select gain relative to the system under test. If the
waveform monitor display amplitude is much less than would
be expected for the given input, a problem may exist with the
Time Code level.
4-16
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Calibration
Instrument gain may require readjustment for special moni-
toring applications. To prevent erroneous measurements,
gain should be adjusted only by qualified personnel. Normal
instrument calibration, performance verification, and service
maintenance are covered in the service manual, which will
be published as a separate volume.
Adjusting Instrument Gain
Instrument gain can be adjusted through the CONFIG—CALI-
BRATE menu. CONFIG menu is described on page 3-18.
Set Vertical Gain
1. To adjust vertical gain, select WAVEFORM display
mode and push the CONFIG menu button. Select
CALIBRATE, then CAL SIG ON and GAIN CAL ON.
a. Turn the VERT CAL control until the calibra-
tor signal (or applied reference signal)
amplitude is 140.0 IRE (1000 mV for PAL),
as read on the graticule.
b. Pushing RESET VCAL will cancel any gain
adjustment and reinstate the factory gain
setting.
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Calibration
Set Horizontal Gain
1. To set horizontal gain, push the CONFIG menu
button. Select CALIBRATE, then CAL SIG ON and 100
KHZ. Select GAIN CAL ON.
a. In 1 LINE SWEEP, adjust the HORIZ CAL
control for one-half cycle per major grati-
cule division; in 2 LINE SWEEP, adjust for
one full cycle per major division.
b. Pushing RESET HCAL will cancel any gain
adjustment and reinstate the factory gain
setting.
Set Vector Gain
1. To adjust vector gain, select VECTOR display mode
and push the CONFIG menu button. Select CALI-
BRATE, then CAL SIG ON and GAIN CAL ON.
a. Adjust VECT CAL so that the calibration
signal circle falls on the compass rose
(outer ring).
b. Pushing RESET VEC CAL will cancel any
gain adjustment and reinstate the factory
gain setting.
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Appendices
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Appendix A
Performance Specification
The specification tables use the following abbreviations:
Performance Requirement (Req). All
performance requirements in the specification tables are
identified with Req, and can be assured by completing
the Performance Check Procedure (1740A/
1750A/1760-Series Service Manual.) Allow a warm-up
time of 20 minutes.
Performance requirements in the electrical specifications
are valid over an ambient temperature range of +20° C to
+30° C. The Performance Requirement tolerances listed
in the Electrical Specification are doubled over the
temperature range of 0° C to +50° C, unless otherwise
specified. Test equipment used to verify Performance
Requirements must be calibrated and working within the
limits specified in the Service Manual Equipment Re-
quired List.
Reference Information. Information that ampli-
fies a performance requirement or is of special impor-
tance is indicated by RI. There is no need to check these
items to a specific tolerance.
Reliability
Mean Time Between Failure (MTBF)
The demonstrated MTBF goal is 40637 hours MTBF at
25° C ambient, which will be monitored from field
failure reports.
Mean Time to Repair (MTTR)
The projected MTTR is 1 hour.
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Appendix A: Performance Specification
Electrical Specifications
Table A-1: Waveform Vertical Deflection
CATEGORY
DESCRIPTION
Deflection Factor
Req: 1 V full scale (X1): 1 volt input displayed with-
in 1% of 140 IRE (1.00 V PAL)
X5 Gain: 0.2 volt input displayed within
1% of 140 IRE (1.00 V PAL)
X10 Gain: 0.1 volt input displayed within 1%
of 140 IRE (1.00 V PAL)
RI: Any one of the 8 inputs
Variable Gain Range
Overscan
Req: 0.2X to 1.4X
Req: ≤1% variation in baseline of chroma when
positioned anywhere between sync tip and
100% white
RI: X1, X5, or X10 with any variable gain
setting
Video Maximum Operating
Input Voltage
RI: --1.8 V to +2.2 V, (all inputs, A -- B3)
dc+peak ac
Absolute Video Input Voltage
Video Input DC Impedance
Video Input Return Loss
RI: --8.5 V to +8.5 V (dc+peak ac)
RI: ≥20kΩ
RI: Typically ≥40 dB to 6 MHz
Video Input DC Offset
Between Channels
Req: ≤1 IRE (7 mV PAL)
RI: Typically ≤1 mV
Video Input Offset Range
RI: CHA2, A3, B2, & B3 can be offset from
CHA1 or CHB1 by 350 mV
Video Input Loop-Through
Isolation
RI: Typically ≥70 dB
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Appendix A: Performance Specification
Table A-1: Waveform Vertical Deflection (Cont.)
CATEGORY
DESCRIPTION
Video Input Crosstalk Between
Channels
RI: Typically ≥60 dB
Req:
2% to 10 MHz (X1 Gain) 4% to 10 MHz
(X5 and X10 Gain), on screen signal (0.2 V or
0.1 V)
Frequency Response (Flat)
RI: All inputs ac or dc coupling
Luminance Filter Gain
Req: 1 1%
RI: Reference is FLAT at 50 kHz
Luminance Filter Response
Req: ≤3 dB attenuation at 1 MHz
≥40 dB attenuation at F
SC
Luminance Filter Chrominance Req: ≤34 dB
Rejection
(1745A & 1755A only)
Chrominance Filter Gain
Req: 1 1%
RI: Ref. is flat at F (3.58 or 4.43 MHz)
SC
Chrominance Filter Bandwidth Req: 1.5 MHz 0.3 MHz
RI: Centered at F . Passband is typically
F
SC
+ and -- 750 kHz
SC
Chrominance Filter
Attenuation at 2X F
RI: ≥25 dB
SC
Differentiated Step Filter
Attenuation at 2X F
RI: ≥40 dB
SC
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Appendix A: Performance Specification
Table A-1: Waveform Vertical Deflection (Cont.)
CATEGORY
DESCRIPTION
Transient Response
Req: Pulse-to-Bar Ratio 0.99:1 to 1.01:1
RI: Preshoot ≤1%
RI: Overshoot ≤1%
RI: Ringing ≤1%
Req: Field-Rate Tilt ≤1%
Req: Line-Rate Tilt ≤1%
RI: Differential Gain ≤1%
Pix Out Gain
Req: 1 3%
Pix Out Frequency Response
Pix Out Differential Gain
Pix Out Differential Phase
Pix Out Output Impedance
Pix Out Return Loss
Req:
3% to 6 MHz
RI: ≤1%
RI: ≤1°
RI: 75Ω
Req: ≥ 30 dB to 6 MHz
Pix Out Line Select Strobe
RI: A dc offset is added to output in line se-
lect to bright up the selected line or lines.
DC Restorer 60 Hz (50 Hz)
Attenuation
Req: Slow Mode ≤10%
Fast Mode ≥95%
RI: Back porch or sync tip clamp point is
selected through menu.
DC Restorer Offset Error
Fast Settling Time
Req: ≤1 IRE (7 mV PAL)
RI: Typically 3 mV
RI: ≤6 video lines
Blanking Shift with 10 to 90%
APL Change
Req: ≤1 IRE (7 mV PAL)
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Appendix A: Performance Specification
Table A-1: Waveform Vertical Deflection (Cont.)
CATEGORY
DESCRIPTION
Blanking Shift with Presence
and Absence of Burst
Req: ≤1 IRE (7 mV PAL)
RI: Typically 3 mV
Table A-2: External Reference
CATEGORY
DESCRIPTION
Input
RI: Composite video or black burst
Maximum Operating Input
Voltage
RI: --1.8 V to +2.2 V, dc + peak ac
Absolute Maximum Input
Voltage
RI: --8.5 V to +8.5 V, dc + peak ac
DC Input Impedance
Return Loss
RI: ≥20 kΩ
RI: Typically ≥40 dB to 6 MHz
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Appendix A: Performance Specification
Table A-3: Waveform Horizontal Deflection
CATEGORY
DESCRIPTION
Sweep
Req: Synchronization: Sweep triggered by horizon-
tal and vertical sync pulses
RI: Sweep Length: ≈12 divisions
RI: Sweep freeruns without input
Sweep Timing Accuracy
Req: 1 Line: 5 ꢀs/division 1%
2 Line: 10 ꢀs/division 1%
RI: 1 Field: displays one full field, including
field rate sync
2 Field: displays two full fields and
the field rate sync between them
Sweep Linearity
Req: 1 line: 1%
2 line: 1%
Magnified Sweep Accuracy
Magnified Sweep Linearity
Horizontal Position Range
External Horizontal Input
Req: 1 Line: 0.2 ꢀs/division 1%
2 Line: 1.0 ꢀs/division 1%
Req: 1 line: 1%
2 line: 1%
Req: Any portion of the synchronized sweep can be
positioned on screen in all sweep modes.
Req: 2 divisions/volt, 2%
RI: Menu is selected and enabled by RE-
MOTE connector ground closure.
Remote Sync
RI: Input Amplitude: TTL level
RI: Frequency: 25 Hz to 100 Hz positive
edge-triggered sweep
RI: Enabling Signal: TTL low or ground
closure
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Appendix A: Performance Specification
Table A-4: Measurement Cursors
CATEGORY
DESCRIPTION
Waveform Accuracy
Req: Voltage: 0.5%
Timing: 0.5%, for line rate sweeps
RI: Typically 0.5% for field rate sweeps
Vector Accuracy
Req: Gain: 1.5%
Phase: 1°
RI: Measured with respect to the Color
Bar signal
Table A-5: RGB/YRGB
CATEGORY
DESCRIPTION
RGB/YRGB
Req: Staircase input gain: 0.8 V/division 10%
RI: RGB Sweep Length:
1 Field ≈30% of normal
1 Line ≈ 30% of normal
RI: YRGB Sweep Length:
1 Field ≈ 25% of normal
1 Line ≈ 25% of normal
RI: Maximum staircase operating signal: DC
signal plus peakacnotto exceed --12 V
to+12 V. Line or field rate sweep.
RI: Peak-to-peak acsignal not to exceed
12 V.
RI: Sweep Repetition Rate: Field or line rate
of displayed video or external
sync signal as selected by the front-
panel sweep selection.
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Appendix A: Performance Specification
Table A-6: Calibrator
CATEGORY
DESCRIPTION
Waveform Square Wave
Req: Amplitude: 1.0 V 0.5%
Req: Frequency: 100 kHz 0.1%
RI: Crystal controlled 10 ꢀs square wave
Waveform Sine Wave
Vector Circle
Req: Amplitude: 1.0 V
,
1%
p-p
RI: Circle that approximates the graticule
compass rose
Table A-7: Vector Mode
CATEGORY
DESCRIPTION
Input Requirements
Req: 1 V
6 dB
Instrument freeruns with no input
p--p
RI:
RI: External Reference: Black burst or com-
posite video
Nominal Subcarrier Frequency
(F
RI: NTSC 3.579545 MHz
PAL 4.43361875 MHz
)
SC
Chrominance Processing Band- Req: 1 MHz 200 kHz
width (--3 dB)
PAL +V
RI: V Axis is inverted at 1/2 video line
rate.
Display Phase Accuracy Error
Display Gain Accuracy Error
Quadrature Phasing Error
Req: ≤1.25°
Req: ≤2.5% with 75% amplitude color bars
Req: ≤0.5° ⟨Bursts set to targets)
Subcarrier Regenerator Pull-in
Range
Req: NTSC:
PAL:
50 Hz
10 Hz
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Appendix A: Performance Specification
Table A-7: Vector Mode (Cont.)
CATEGORY
DESCRIPTION
Subcarrier Regenerator Pull-in
Time
RI: ≤2 seconds
Phase Shift with F Change
SC
Req: NTSC: ≤2° (F to F
50 Hz)
10 Hz)
SC
SC
SC
PAL:
≤2° (F to F
SC
Phase Shift with Burst
Amplitude Change of 6 dB
Req: ≤ 2°
Phase Shift With Video Input
Channel Change
Req: ≤1°
RI: With external reference selected.
Typically ≤0.5°
Phase Shift With Variable Gain
Control +3 dB to --6 dB.
Req: ≤0.5°
Burst Jitter
RI: ≤0.5° rms
Clamp Stability
Req: ≤1/64 inch (0.4 mm)
RI: Center spot movement with rotation of
the phase control
Phase Control Range
Phase Control Quantization
Position Control Range
Differential Phase
RI: 360° continuous rotation
RI: ≤0.2°
Req: ≥0.236 inch (6 mm) from center
Req: ≤1°
Differential Gain
Req: ≤1%
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Appendix A: Performance Specification
Table A-8: Audio Mode
CATEGORY
DESCRIPTION
Input
RI: DC coupled, differential input
Input Impedance
RI: 20 kΩ
Full Scale Selection
Full Scale Accuracy
RI: 0, 4, 8, & 12 dBm full scale. Menu se-
lected
Req:
0.5 dB
RI: Measured at 1 kHz
Maximum Input Voltage
RI:
8 V peak
RI: Measured to chassis ground
Bandwidth (--3 dB)
Req: -- 3 d B ≥200.0 kHz
X & Y Input Phase Matching
Req: ≤1°
RI: Measured at 20 kHz
Table A-9: Time Code
CATEGORY
DESCRIPTION
Input
RI: Longitudinal Time Code. DC coupled,
differential input
Input Impedance
Input Amplitude
RI: 20 kΩ.
RI: 0, 4, 8, & 12 dBm full scale. Menu
selectable for 140 IRE (1.0 V) deflection
Maximum Input Voltage
Bandwidth (--3 dB)
RI: --10 V to +10 V peak
Req: ≥200.0 kHz
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Appendix A: Performance Specification
Table A-10: SCH Phase Mode (1750-Series Only)
CATEGORY
DESCRIPTION
Absolute Accuracy
Req: ≤5°
RI: Applies over a temperature range of
0 -- 50° C
RI: Calibrated at 25° C.
3 dB input
amplitude. Typically ≤5° with
6 dB input amplitude
Relative Accuracy
Acquisition Time
RI: 2°
RI: ≤1 Second
RI:
1.25°
Displayed Phase Error Caused
by CRT Geometry Variations
Input Timing
RI: Stable display with Video to External
Reference timing
Color Frame Range
RI:
70° (Color frame correctly
identified when applied external refer-
ence signal is ≤70° of 0° SCH.)
Table A-11: CRT Display (PAL Values in Parentheses)
CATEGORY
DESCRIPTION
CRT Viewing Area
RI: 80 X 100 mm
Horizontal: 12.5 divisions
Vertical: 170 IRE (1.19 V)
Accelerating Potential
Trace Rotation Range
RI: Nominally 13.75 kV
Req: < + and --1° from horizontal
RI: Total adjustment range is typically ≥8°.
Graticule
RI: Internal with variable illumination
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Appendix A: Performance Specification
Table A-12: Power Source
CATEGORY
DESCRIPTION
Mains Voltage Range
Req: 90--250 V
RI: Continuous range from 90 to 250 Vac
Mains Frequency
RI: 50 or 60 Hz.
Power Consumption
RI: 110 VA (67 watts) maximum; 102 VA
(60 watts) typical
Table A-13: Environmental Characteristics
CATEGORY
DESCRIPTION
Operating Temperature
Req: 0° to 50° C (+32° to 122° F)
Storage Temperature
Operating Altitude
Storage Altitude
Vibration
Req: -- 4 0 ° to 75° C (--40° to 158° F)
Req: To 15,000 feet (4572 meters)
Req: To 50,000 feet (15,240 meters)
Req: 5 minutes at 5 -- 15 Hz with 0.060 inch dis-
placement
5 minutes at 15 -- 25 Hz with 0.040 inch dis-
placement
5 minutes at 25 -- 55 Hz with 0.020 inch dis-
placement
Military Specification: Mil--T--28800D,
Paragraph 1.2.2, Class 3
Mechanical Shock
Transportation
Humidity
Req: Non Operating: 50 g 1/2 sine, 11 ms duration
3 shocks per surface (18 total)
Req: Qualified under NSTA Test Procedure 1A,
Category II (24 inch drop)
Req: Will operate at 95% relative humidity for up to
five days. Do not operate with visible moisture
on the circuit boards.
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Appendix A: Performance Specification
Table A-14: Physical Characteristics
CATEGORY
DESCRIPTION
Dimensions
Req: Height: 5 1/4 inches (133.4 millimeters)
Width: 8 1/2 inches (215.9 millimeters)
Depth: 18 1/8 inches (460.4 millimeters)
Weight
Req: Net:
Shipping:
8 pounds (3.8 kilograms)
15.7 pounds (7.2 kilograms)
approximate
Certifications and Compliances
Table A-15: Certifications and compliances
CATEGORY
STANDARDS OR DESCRIPTION
EC Declaration of
Conformity -- EMC 1
Meets intent of Directive 89/336/EEC for Electromagnetic
Compatibility. Compliance was demonstrated to the following
specifications as listed in the Official Journal of the European
Union:
EN 50081-1 Emissions:
EN 55022
Class B Radiated and Conducted Emissions
EN 50082-1 Immunity:
IEC 801-2
IEC 801-3
IEC 801-4
Electrostatic Discharge Immunity
RF Electromagnetic Field Immunity
Electrical Fast Transient/Burst Immunity
1
High-quality shielded cables must be used to ensure
compliance to the above listed standards. This product
complies when installed into any of the following Tektronix
instrument enclosures:
1700F00 Standard Cabinet
1700F02 Portable Cabinet
1700F05 Rack Adaptor
AS/NZS 3548
Information Technology Equipment: 1995
FCC Compliance
Emissions comply with FCC Code of Federal Regulations 47, Part
15, Subpart B, Class A Limits.
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Appendix A: Performance Specification
Table A-15: Certifications and compliances (cont.)
CATEGORY
STANDARDS OR DESCRIPTION
Installation
(Overvoltage)
Category
Terminals on this product may have different installation
(overvoltage) category designations. The installation categories
are:
CAT III Distribution-level mains (usually permanently
connected). Equipment at this level is typically in a fixed
industrial location.
CAT II Local-level mains (wall sockets). Equipment at this level
includes appliances, portable tools, and similar
products. Equipment is usually cord-connected.
CAT I
Secondary (signal level) or battery operated circuits of
electronic equipment.
Pollution Degree
A measure of the contaminates that could occur in the
environment around and within a product. Typically the internal
environment inside a product is considered to be the same as the
external. Products should be used only in the environment for
which they are rated.
Pollution Degree 1
No pollution or only dry, nonconductive pollution occurs.
Products in this category are generally encapsulated,
hermetically sealed, or located in clean rooms.
Pollution Degree 2
Normally only dry, nonconductive pollution occurs.
Occasionally a temporary conductivity that is caused by
condensation must be expected. This location is a typical
office/home environment. Temporary condensation occurs
only when the product is out of service.
Pollution Degree 3
Conductive pollution, or dry, nonconductive pollution that
becomes conductive due to condensation. These are
sheltered locations where neither temperature nor humidity is
controlled. The area is protected from direct sunshine, rain, or
direct wind.
Pollution Degree 4
Pollution that generates persistent conductivity through
conductive dust, rain, or snow. Typical outdoor locations.
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Appendix A: Performance Specification
Table A-15: Certifications and compliances (cont.)
CATEGORY
STANDARDS OR DESCRIPTION
Safety Standards
U.S. Nationally
Recognized Testing
Laboratory Listing
UL1244
Standard for electrical and electronic measuring and test
equipment.
Canadian Certification CAN/CSA C22.2 No. 231
CSA safety requirements for electrical and electronic
measuring and test equipment.
European Union
Compliance
Low Voltage Directive 73/23/EEC, amended by 93/69/EEC
EN 61010-1 Safety requirements for electrical equipment for
measurement, control, and laboratory use.
Additional Compliance IEC61010-1
Safety requirements for electrical equipment for
measurement, control, and laboratory use.
Safety Certification Compliance
Temperature,
operating
+5 to +40_ C
Altitude (maximum
operating)
2000 meters
Equipment Type
Safety Class
Test and measuring
Class 1 (as defined in IEC 1010-1, Annex H) -- grounded product
Overvoltage Category Overvoltage Category II (as defined in IEC 1010-1, Annex J)
Pollution Degree
Pollution Degree 2 (as defined in IEC 1010-1). Note: Rated for
indoor use only.
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Appendix B
Remote Connectors
Remote Connector
The rear-panel REMOTE connector (shown in Figure B-1) is
a 25-pin sub miniature D-type with female contacts.
Table B-1 shows pin assignments.
13
1
25
14
REMOTE
!
Figure B-1. Rear panel REMOTE connector.
Table B -1. Remote Pin Functions and Signal Requirements
Pin No.
Function
Signal Requirement
Miscellaneous Information
1
RGB/YRGB +10 V for RGB/
Staircase Input YRGB
≈9 div of sweep.
(Staircase/external horizontal and
RGB/YRGB selections are made
through the menu.)
External Hori-
zontal Input
10 div. of horiz. deflection.
0 - +5 V Sawtooth
2
3
Ground
Staircase / Ext. Ground (TTL low)
Horizontal En-
able
Grounding this pin enables the
function. (Staircase or external
horizontal selected by menu.)
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Appendix B: Remote Connectors
Table B -1. Remote Pin Functions and Signal Requirements (Cont.)
Pin No.
Function
Signal Requirement
Miscellaneous Information
4
External Blank- Negative-going
signal
Enabled by menu selection.
ing Input
5
6
Remote Sync
Input
TTL level square
wave triggers a
2-field rate sweep.
30/90 Hz for NTSC
25/100 Hz for PAL
Remote Sync
Enable
Ground (TTL low)
Grounding this pin enables the
function.
7
8
Ground
+Y Audio Input Max. Input 8 V
peak
Measured to Chassis Ground.
Measured to Chassis Ground.
Measured to Chassis Ground.
Measured to Chassis Ground.
9
-Y Audio Input Max. Input 8 V
peak
10
11
12
13
+X Audio Input Max. Input 8 V
peak
-X Audio Input Max. Input 8 V
peak
+ Time Code
Input
-10 - +10 V peak
Longitudinal Time Code, differen-
tial.
- Time Code
Input
-10 - +10 V peak
Longitudinal Time Code, differen-
tial.
14
15
16
17
Ground
Not used
Not used
Preset 1
Ground (TTL low)
Ground (TTL low)
Grounding pin 17 recalls front-
panel setup from preset 1.
Grounding pins 17 and 25 stores
current front-panel setup at preset
1.
18
Preset 2
Grounding pin 18 recalls front-
panel setup from preset 2.
Grounding pins 18 and 25 stores
current front-panel setup at preset
2.
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Appendix B: Remote Connectors
Table B -1. Remote Pin Functions and Signal Requirements (Cont.)
Pin No.
Function
Preset 3
Signal Requirement
Miscellaneous Information
19
Ground (TTL low)
Grounding pin 19 recalls setup
from preset 3. Grounding pins 19
and 25 stores current setup at
preset 3.
20
21
Preset 4
Preset 5
Ground (TTL low)
Ground (TTL low)
Grounding pin 20 recalls setup
from preset 4. Grounding pins 20
and 25 stores current setup at
preset 4.
Grounding pin 21 recalls setup
from preset 5. Grounding pins 21
and 25 stores current setup at
preset 5.
22
23
24
25
Preset 6
Preset 7
Preset 8
Store
Ground (TTL low)
Ground (TTL low)
Ground (TTL low)
Ground (TTL low)
Grounding this pin along with one
of the Preset pins stores the cur-
rent front-panel setup at the se-
lected Preset location.
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Appendix B: Remote Connectors
Remote Connector Converter
When the 1740A/1750A-Series is used as a direct replace-
ment for a 1740-Series or 1750-Series instrument, construct
an adapter or rewire the remote cable according to
Figure B-2.
1740A/1750A--Series
Rear-Panel
REMOTE Connector
Remote Plug
RGB INPUT
1
1
14
14
RGB ENABLE
3
REMOTE SYNC IN
GROUND
5
6
7
19
8
9
REMOTE SYNC ENABLE
10
25
25
13
13
Figure B-2. REMOTE adapter for 1740/1750---Series replacement.
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Appendix B: Remote Connectors
RS232 Connector
The serial interface has a driver built in for RS232 serial
binary data interchange. The operational mode is full du-
plex. The data rate is selectable through the Configure menu
for either 1200, 4800, or 9600 baud; data type is asynchro-
nous. Figure B-3 shows the pin assignments.
DATA
CONNECTION
PIN
NUMBER
1.
2.
3.
4.
5.
6.
7.
8.
9.
DCD
RXD (RECEIVED DATA)
TXD (TRANSMITTED DATA)
DTR (DTE READY)
SIGNAL GROUND
DCR (DCE READY)
RTS (REQUEST TO SEND)
CTS (CLEAR TO SEND)
NOT CONNECTED
5
1
9
6
RS232
Figure B-3. Rear panel RS232 connector.
NOTE
The function of the RS232 connector may not be
supported at the time of this printing. The RS232
interface is used during an upgrade of the instru-
ment software. Contact Tektronix for information
on availability of software upgrades and RS232
remote control commands.
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Appendix C
User Service
Cleaning or Replacing the Fan Filter
To ensure adequate air flow, it is essential to clean or replace
the rear-panel fan filter regularly. The interval between filter
cleaning or replacement is determined by the operating
environment.
To remove the filter, take out the two screws that fasten the
housing to the rear panel.
Remove the filter and wash it in a mild detergent and water
solution. Place cleaned and dried filter (or new filter) in the
housing and replace housing over the fan. Replace and
tighten the two screws (8 in lbs).
The filter part number is shown on page 1-7.
Fuse Replacement
Remove the fuse cap from the rear panel and replace the fuse
cartridge with a 250V, 2A, F-type fuse as specified on the
rear panel.
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Appendix C: User Service
Graticule Light Replacement
Replacement Bulbs
Replacement bulbs are supplied with this instru-
ment as Standard Accessories. Additional bulbs
can be purchased from Tektronix or from local
electronics distribution sources. The Tektronix
part number and ordering information is given on
page 1-7.
Required Equipment
NOTE
For graticule light removal and replacement,
tweezers with curved, serrated tips are recom-
mended. For example, Miltex PL312,6-100
(equivalent to PL312) or PL317 (longer than
PL312).
CAUTION
Needle-nosed pliers are not recommended.
Procedure
1. Remove the five knobs below the CRT.
2. Insert a small, straight-blade screwdriver into the re-
cessed area on either the right or left side of the panel.
Pry gently until the panel snaps out of the front-panel
frame. See Figure C-1 for panel and recess location.
C-2
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Appendix C: User Service
3. To remove a bulb, position the tweezer tips on the thin,
flat portion of the bulb (close to the plastic socket).
Carefully pull the bulb straight out.
4. To install a new bulb, hold it with the tweezers as de-
scribed in step 3, position it in front of the socket, and
push the bulb until it snaps in place.
5. Replace the panel below the CRT, and press on both the
right and left sides of the panel until it snaps into place.
6. Replace the five knobs below the CRT and tighten the
set screws.
Recess
Recess
Remove this panel
(shaded portion)
Remove these five knobs
Figure C-1. Graticule light replacement.
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Appendix C: User Service
Cleaning
The instrument should be cleaned often enough to prevent
dust and dirt from accumulating. Dirt acts as a thermal
insulator, preventing effective heat dissipation, and can also
provide high-resistance electrical leakage paths between
conductors or components in a humid environment.
CAUTION
Do not allow water to get inside any enclosed
assembly or component. Do not clean any plastic
materials with benzene, toluene, xylene, acetone,
or similar compounds, because they may damage
the plastic.
Exterior
Clean the dust from the outside of the instrument with a soft,
clean cloth or small brush. A brush is especially useful for
removing dust from around the selector buttons, knobs, and
connectors. Hardened dirt can be removed using a soft cloth
dampened with a mild detergent and water solution. Abra-
sive cleaners should not be used.
CRT
Clean the light filter and CRT face with a soft, lint-free cloth
dampened in denatured alcohol. Abrasive cleaners should
not be used.
Interior
Interior cleaning and maintenance should be performed by
qualified service personnel only. Instructions for interior
maintenance are provided in the service manual.
C-4
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Appendix C: User Service
CAUTION
A 2% RMA flux content solder is recommended for
making repairs in this instrument. Cleaning of
rosin residue is not recommended. Most cleaning
solvents tend to reactivate the rosin and spread it
under components where it may cause corrosion
under humid conditions. The rosin residue, if left
alone, does not exhibit these corrosive properties.
Replacing the CRT Filter
A smoke-gray filter is installed over the face of the CRT.
The filter part number is given on page 1-7. If the filter
becomes damaged, it can be replaced in the following
manner:
1. Remove the five knobs below the CRT.
2. Insert a small, straight-blade screwdriver into the re-
cessed area on either the right or left side of the panel.
Pry gently until the panel snaps out of the front-panel
frame. See Figure C-1 for panel and recess location.
3. Remove the two Torx screws that fasten the bezel to
the instrument.
4. Grasping the bottom of the bezel, pull out and upward to
remove the bezel from the instrument. (There are two
hinges at the top of the bezel that hold it in place; once
the bezel is at an approximate 45° angle with the front
panel, they will disengage.)
5. Remove the damaged filter and snap the new filter into
place on the back side of the bezel. Position the ridged
side of the filter towards the CRT to eliminate unwanted
visual effects on the CRT face.
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Appendix C: User Service
6. Replace the bezel and bezel screws. Tighten screws (8
in lbs).
7. Replace the panel below the CRT, and press on both the
right and left sides of the panel until it snaps into place.
8. Replace the five knobs below the CRT and tighten the
set screws.
C-6
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Appendix D
Software Version
Table D-1 details software releases from SNB010100 to
present. If a new release occurs after this manual is printed,
a revised Table D-1 will be shipped with the manual.
Table D-1. Software Releases
Ver-
sion
Date
Serial No.
Mod
No.
Comments
Original software.
1.00
1.01
SEP 1992 1740A’s
B010100
NOV
1992
1740A’s
B010458
M7875 Installed in new products, not sent for
0
field upgrade.
1750A’s
B010100
•
•
Added AUTO unit of measure
selection for CURSORS.
Added flashing on-screen indicator
for Gain RESET; Line Select
NEXT FIELD, ALT 2 FIELD, and
ALT 4 FIELD; and all Preset but-
tons.
•
•
Added SCH R--Y filter to 1750A-
Series filter selections.
When Remote Sync is enabled, the
on-screen TIME/DIV is not pres-
ent. When Remote Sync or Exter-
nal Horizontal is enabled with tim-
ing cursors, “UNCAL” is dis-
played in place of a quantitative
readout.
1.02
1.03
NOV
1992
Custom
Custom
N/A
N/A
N/A
N/A
DEC
1992
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Appendix D: Software Version
Table D-1. Software Releases (Continued)
Ver-
sion
Date
Serial No.
Mod
No.
Comments
1.04
JAN
1993
1740/41A, M7891 Product enhancement to coincide with
1750/51A
B010729
4
the release of dual-standard monitors.
Not sent for field upgrade.
1745/55A
B010100
• Remote sync changed to positive
edge trigger.
• CONFIG REFERENCE menu now
avail. only for dual-standard moni-
tors. A123/B123 Follow selection
deleted, replaced with A123/B123
Composite / Component selections
in CONFIG INPUT menu.
• Dual-standard monitors: When
NTSC & PAL ext ref’s are set the
same, and EXT REF is selected,
the ext ref channel is used to
determine the video standard.
When NTSC & PAL ext ref’s dif-
fer, the displayed video channel de-
termines the video standard.
2.1
2.2
APR
1993
B011760
M7928 Added Vector cursors and markers and
3
modified the operation of the
A123/B123 INPUT buttons.
OCT
1993
New features: On-screen field sweep
indication. Configure menu selection
for RGB Parade display. Audio &
Time Code unit of measure changed to
dBu. On-screen pointer to left or right
side graticule for dual standard. Lim-
ited the 1 of 4 and 1 of 8 line select
menu entries to instruments with SC/H
function only.
D-2
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Glossary
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Glossary
AC Coupled A connection which removes the constant
voltage (DC component) on which the signal (AC compo-
nent) is riding. Usually implemented by passing the signal
through a capacitor.
APL (Average Picture Level.) The average signal level
(with respect to blanking) during active picture time, ex-
pressed as a percentage of the difference between the blank-
ing and reference white levels.
Back Porch The portion of the video signal which lies
between the trailing edge of the horizontal sync pulse and the
start of the active picture time. Burst is located on back
porch.
Bandwidth The range of frequencies over which signal
amplitude remains constant (within some limit) as it is
passed through a system.
Baseband Refers to the composite video signal as it exists
before modulating the picture carrier. Composite video
distributed throughout a studio and used for recording is at
baseband.
Black Burst (NTSC) Also called ”color black,” black
burst is a composite video signal consisting of all horizontal
and vertical synchronization information, burst, and usually
setup. Typically used as the house reference synchronization
signal in television facilities.
Black Burst (PAL) Also called ”color black,” black
burst is a composite video signal consisting of all horizontal
and vertical synchronization information and burst. Typical-
ly used as the house reference synchronization signal in
television facilities.
Blanking Level Refers to the 0 IRE level for NTSC
systems (0.3 volt level, with respect to sync tip, for PAL
systems) which exists before and after horizontal sync and
during the vertical interval.
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Glossary
Breezeway The portion of the video signal which lies
between the trailing edge of the horizontal sync pulse and
the start of burst. Breezeway is part of back porch.
Broad Pulses Another name for the vertical synchroniz-
ing pulses in the center of the vertical interval. These pulses
are long enough to be distinguished from all others, and are
the part of the signal actually detected by vertical sync
separators.
Bruch Blanking (PAL) A 4-field burst blanking se-
quence employed in PAL signals to ensure that burst phase is
the same at the end of each vertical interval.
Burst (NTSC) A small reference packet of the subcarrier
sine wave, typically 8 or 9 cycles, which is sent on every line
of video. Since the carrier is suppressed, this phase and
frequency reference is required for synchronous demodula-
tion of the color information in the receiver.
Burst (PAL) A small reference packet of the subcarrier
sine wave sent during the horizontal blanking interval on
every line of video. Since the carrier is suppressed, this
phase and frequency reference is required for synchronous
demodulation of the color difference signals in the receiver.
B--Y (NTSC) One of the color difference signals used in
the NTSC system, obtained by subtracting luminance from
the blue camera signal. This is the signal which drives the
horizontal axis of a vectorscope.
B--Y (PAL) One of the color difference signals used in the
PAL system, obtained by subtracting luminance (Y) from the
blue camera signal (B).
Chrominance Chrominance refers to the color informa-
tion in a television picture. Chrominance can be further
broken down into two properties of color: hue and satura-
tion.
Chrominance Signal The high-frequency portion of
the video signal which is obtained by quadrature amplitude
modulation of a 3.58 MHz (NTSC) or 4.43 MHz (PAL)
subcarrier with R-Y and B-Y information.
Color Black See Black Burst.
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Glossary
Color Difference Signals Signals used by color
television systems to convey color information in such a way
that the signals go to zero when there is no color in the
picture. R-Y, B-Y, I, and Q are all color difference signals
for the NTSC system; U and V are color difference signals
for the PAL system.
Component Video Video which exists in the form of
three separate signals, all of which are required in order to
completely specify the color picture. For example, R, G, and
B; or Y, R-Y, and B-Y.
Composite Video A single video signal containing all of
the necessary information to reproduce a color picture.
Created by adding quadrature amplitude modulated R-Y and
B-Y to the luminance signal for NTSC systems or U and V
to the luminance signal for PAL systems.
CW Continuous Wave. Refers to a separate subcarrier sine
wave used for synchronization of chrominance information.
dB (Decibel) A decibel is a logarithmic unit used to
describe signal ratios. For voltages, dB = 20 Log10 (V1/V2).
DC-Coupled A connection configured so that both the
signal (AC component) and the constant voltage on which it
is riding (DC component) are passed through.
DC Restorer A circuit used in picture monitors and
waveform monitors to clamp one point of the waveform to a
fixed DC level.
Demodulator In general, this term refers to any device
which recovers the original signal after it has modulated a
high-frequency carrier. In television it may refer to:
(1) An instrument, such as a TEKTRONIX 1450, which
takes video in its transmitted form (modulated onto the
picture carrier) and converts it to baseband.
(2) The circuits which recover R-Y and B-Y for NTSC
systems or U and V for PAL systems from the composite
signal.
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Glossary
Distortion If a sine wave of a single frequency is put into
a system, and harmonic content at multiples of that frequen-
cy appears at the output, there is harmonic distortion present
in the system. Harmonic distortion is caused by non-lineari-
ties in the system.
Equalizer The pulses which occur before and after the
broad pulses in the vertical interval.
Envelope Detection A demodulation process in which
the shape of the RF envelope is sensed. This is the process
used by a diode detector.
Field In interlaced scan systems, the information for one
picture is divided up into two fields. Each field contains one
half of the lines required to produce the entire picture.
Adjacent lines in the picture are in alternate fields.
Frequency Modulation (FM) is the process by which
the frequency of a carrier signal is varied in proportion to the
signal of interest. In both the NTSC and PAL television
systems, audio information is transmitted using FM.
Frame A frame (sometimes called a ”picture”) contains all
the information required for a complete picture. For inter-
laced scan systems, there are two fields in a frame.
Front Porch The portion of the video signal between the
end of active picture time and the leading edge of horizontal
sync.
Gamma (NTSC) Since picture monitors have a non-lin-
ear relationship between the input voltage and brightness, the
signal must be correspondingly predistorted. Gamma correc-
tion is always done at the source (camera) in television
systems: the R, G, and B signals are converted to R1/V, G1/V,
and B1/V. Values of about 2.2 are typically used for gamma.
Gamma (PAL) Since picture monitors have a non-linear
relationship between the input voltage and brightness, the
signal must be correspondingly predistorted. Gamma correc-
tion is always done at the source (camera) in television
systems: the R, G, and B signals are converted to R1/V, G1/V,
and B1/V. Values for gamma range from 2.2 to 2.8.
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Glossary
Gen Lock The process of locking both sync and burst of
one signal to sync and burst of another, making the two
signals completely synchronous.
Graticule The scale which is used to quantify the informa-
tion on a waveform monitor or vectorscope display. Grati-
cules may either be screened onto the faceplate of the CRT
itself (internal graticule), or onto a piece of glass or plastic
which fits in front of the CRT (external graticule). They can
also be electronically generated.
Horizontal Blanking Horizontal blanking is the entire
time between the end of the active picture time of one line
and the beginning of active picture time of the next line. It
extends from the start of front porch to the end of back
porch.
Horizontal Sync Horizontal sync is the -40 IRE pulse in
NTSC systems (-300 mV pulse for PAL systems) occurring
at the beginning of each line. This pulse signals the picture
monitor to go back to the left side of the screen and trace
another horizontal line of picture information.
Hue Hue is the property of color which allows us to distin-
guish between colors such as red, yellow, purple, etc.
Hum Hum refers to the undesirable coupling of the 60 Hz
power sine wave for NTSC systems (50 Hz power sine wave
in PAL systems) into other electrical signals.
ITS (PAL) Insertion Test Signal. A test signal which is
inserted in one line of the vertical interval to facilitate
in-service testing.
IRE (NTSC) A unit equal to 1/140 of the peak-to-peak
amplitude of the video signal, which is typically 1 volt. The
0 IRE point is at blanking level, with sync tip at -40 IRE and
white extending to +100 IRE. IRE stands for Institute of
Radio Engineers, the organization which defined the unit.
Linear Distortion Refers to distortions which are inde-
pendent of signal amplitude.
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Glossary
Luminance The signal which represents brightness, or the
amount of light in the picture. This is the only signal re-
quired for black and white pictures, and for color systems it
is obtained as a weighted sum (Y = 0.3R + 0.59G + 0.11B) of
the R, G, and B signals.
Modulated (NTSC) When referring to television test
signals, this term implies that chrominance information is
present. (For example, a modulated staircase has subcarrier
on each step.)
Modulated (PAL) When referring to television test
signals, this term implies that chrominance information is
present. (For example, a modulated ramp has subcarrier on
each step.)
Modulation A process which allows signal information to
be moved to other frequencies in order to facilitate transmis-
sion or frequency-domain multiplexing. See AM and FM
for details.
Non--Linear Distortion Refers to distortions which are
amplitude-dependent.
NTSC National Television System Committee. The orga-
nization which developed the television standard currently in
use in the United States, Canada, and Japan. Now generally
used to refer to that standard.
PAL Phase Alternate Line. Refers to one of the television
systems used in Europe and many other parts of the world.
The phase of one of the color difference signals alternates
from line to line to help cancel out phase errors.
Quadrature AM A process which allows two different
signals to modulate a single carrier frequency. The two
signals of interest Amplitude Modulate carrier signals which
are the same frequency but differ in phase by 90 degrees
(hence the Quadrature notation). The two resultant signals
can be added together, and both signals recovered at the other
end, if they are also demodulated 90 degrees apart.
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Glossary
Quadrature Distortion Distortion resulting from the
asymmetry of sidebands used in vestigial sideband television
transmission. Quadrature distortion appears when envelope
detection is used, but can be eliminated by using a synchro-
nous demodulator.
RF Radio Frequency. In television applications, RF gener-
ally refers to the television signal after the picture carrier
modulation process
RGB Red, Green, and Blue. Also referred to as GBR. The
three primary colors used in color television’s additive color
reproduction system. These are the three color signals
generated by the camera and used by the picture monitor to
produce a picture.
R--Y One of the color difference signals is obtained by
subtracting luminance (Y) from the red camera signal.
Saturation The property of color which relates to the
amount of white light in the color. Highly saturated colors
are vivid, while less saturated colors have more white mixed
in and, therefore, appear pastel. For example, red is highly
saturated, while pink is the same hue, but much less satura-
ted.
In signal terms, saturation is determined by the ratio between
luminance level and chrominance amplitude. It should be
noted that a vectorscope does not display saturation; the
length of the vectors represents chrominance amplitude. In
order to verify that the saturation of the colors in a color bar
signal is correct, you must check luminance amplitudes with
a waveform monitor in addition to observing the vectors.
SCH The timing relationship between the horizontal sync
pulses and the zero crossings of the reference subcarrier
(burst).
Setup In NTSC systems, video black is typically 7.5 IRE
above the blanking level. This 7.5 IRE level is referred to as
the black setup level, or simply as setup.
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Glossary
Subcarrier The modulation sidebands of the color subcar-
rier contain the R-Y (V) and B-Y (U) information. For
NTSC, subcarrier frequency is 3.579545 MHz. For PAL,
subcarrier frequency is 4,433,618.75 Hz.
Synchronous Detection A demodulation process in
which the original signal is recovered by multiplying the
modulated signal with the output of a synchronous oscillator
locked to the carrier.
Termination In order to accurately send a signal through
a transmission line, there must be an impedance at the end
which matches the impedance of the source and of the line
itself. Amplitude errors and reflections will otherwise result.
Video is a 75 Ω system, so a 75 Ω terminator must be put at
the end of the signal path.
Time Code, Longitudinal (LTC) LTC is an 80-bit
signal with information which makes it possible to accurately
identify an individual frame. The LTC signal is typically
recorded on an audio channel.
Time Code, Vertical (VITC) VITC is a signal in the
vertical interval of video, which makes it possible to accu-
rately identify an individual field.
U The B-Y signal after a weighting factor of 0.493 has been
applied. The weighting is necessary to reduce peak modula-
tion in the composite signal.
Unmodulated When used to describe television test
signals, this term refers to pulses and pedestals which do not
have high-frequency chrominance information added to
them.
V The R-Y signal after a weighting factor of 0.877 has been
applied. The weighting is necessary to reduce peak modula-
tion in the composite signal.
Vectorscope A specialized oscilloscope which demodu-
lates the video signal and presents a display of R-Y versus
B-Y in NTSC systems (or V versus U in PAL systems). The
angle and magnitude of the displayed vectors are respectively
related to hue and saturation.
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Glossary
Vertical Interval The synchronizing information which
appears between fields and signals the picture monitor to go
back to the top of the screen to begin another vertical scan.
Waveform Monitor A specialized oscilloscope that plots
voltage versus time to evaluate television signals.
Y Abbreviation for luminance.
Zero Carrier Reference A pulse in the vertical interval
which is produced by the demodulator to provide a reference
for evaluating depth of modulation.
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Index
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Index
Certifications, A-13
Compliances, A-13
A
A123/B123, 2-6, 3-4
Chroma bandwidth measurements, 3-7,
4-9
Accessories, 1-7
field upgrade kits, 1-8
incoming inspection list, 1-9
optional, 1-7
Clamp point, 3-18
Cleaning
air filter (fan filter), C-1
the CRT, C-4
standard (included), 1-7
Air filters, replacement, 1-7
Audio display, 2-5, 3-2
Audio measurements, 4-15
Audio Mode, Specification, A-10
Auto
the instrument, C-4
Clear menu, 2-8
Color framing, 3-2
Component signals, 4-3
Configure menu, 3-18
calibrate, 3-21
cursor units, 3-20
television standard, 3-20
reference, 3-23
remote, 3-23
standard (NTSC/PAL), 3-20
vector, 3-18
B
Back porch, 3-18
Connectors, rear-panel, 2-8
Controls, front-panel, 2-1
Coupling, AC/DC, 3-18
CRT
Bezel buttons, 2-2
Bezel controls, 2-2
Blank panel (optional accessory), 1-8
BNC inputs, 2-8
filter part number, 1-7
filter replacement, C-5
menu, 3-24
options, 1-6
CRT Display, Specification, A-11
Cursor menu, 3-8
C
Cabinets (optional accessories)
installation, 1-12
part numbers, 1-8
Calibrator, Specification, A-8
Calibrator signal frequency, 3-22
Camera (optional accessory), 1-7
Carrying case (optional accessory), 1-8
D
DC restorer, 2-5
slow or fast, 3-18
Differential gain measurements, 4-9
Differential phase measurements, 4-9
Differentiated step filter, 3-7
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Index
Dimensions, A-13
menu, 3-24
Display modes, 2-5, 3-1
Dual-standard graticule, 4-8
reset, 3-22
X1, X5, X10, 3-24
Graticule
illumination, 3-24
vector, 4-7
E
Electrical installation, 1-10
waveform, 4-1
Graticule lights
part number, 1-7
replacement, C-2
Electrical specification, A-2
Environmental Characteristics, Specifica-
tion, A-12
External horizontal, 3-23
External Reference, Specification, A-5
External reference, 2-6, 2-8
configure, 3-23
H
HAD bar, 4-5
for dual-standard monitors, 3-23
Horizontal Deflection, Specification, A-6
F
Factory preset, 3-16
I
Input channels, 2-6, 3-3
Input connectors, 2-8
Input coupling, 3-18
Installation, 1-9
Fan filter
cleaning or replacing, C-1
part number, 1-7
Field sweeps, 2-5
Field upgrade kits, 1-8
Filter, air, see fan filter, 1-7
Filtering, 3-7
electrical, 1-10
mechanical, 1-12
remote connector, 1-11
Intensity adjustment, 1-15, 3-24
Focus, 3-24
Front-panel illustration, 2-3
Front-panel controls, 2-1
K
K-factor measurements, 4-5
Front-panel cover (optional accessory),
1-7
Fuse
part number, 1-7
replacing, C-1
L
Light bulbs, part number, 1-7
Line select menu, 3-14
Line/Field selection, 2-5
Lissajous waveform, 4-15
Luminance filter, 3-7
G
Gain
adjustment, 4-17
I-2
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Index
Overlay mode, 2-7, 3-4
M
Magnifier, 2-5, 3-4
Mains frequency, 1-11
Manual, part numbers, 1-7
Markers, 3-9
P
Packaging for shipment, 1-9
Parade mode, 2-6, 3-4
Measurement Cursors, Specification, A-7
Measurements, 4-1
audio, 4-15
Performance specification, A-3
Physical Characteristics, Specification,
A-14
chroma bandwidth, 4-9
differential phase and gain, 4-9
horizontal sync amplitude, 4-5
k-factor, 4-5
Picture display, 2-5, 3-2
Pix out (signal for picture monitor), 2-8
Polar cursors, 3-8
Position controls, 2-5
peak white, 4-5
Power cord, 1-5
pulse-to-bar, 4-5
Power Source, Specification, A-12
Power source, 1-10
SCH phase, 4-10
vector, 4-9
Preset menu, 3-16
Mechanical installation, 1-12
Menu
clear menu, 2-8, 3-6
configure, 2-7, 3-18
CRT, 2-7, 3-24
R
R-Y filter, 3-7
cursor, 2-7, 3-8
Rack adapter
filter, 2-7, 3-7
installation, 1-13
gain, 2-7, 3-24
optional accessory, 1-8
Readout intensity, 1-15, 3-24
Rear-panel connectors, 2-8
Recall preset, 3-17
line select, 2-7, 3-14
multiple menu displays, 3-5
preset, 2-7, 3-16
using the menus, 3-5
Multiple display, 2-5, 3-3
Multi-use controls, 2-2
Reference (internal/external), 3-23
Reliability, A-1
Remote connector
configuration, 3-23
description, 2-9, B-1
pin assignments, B-1
wiring converter, B-4
Remote sync, B-2
O
Offsets, enable, 3-21
Operating standard, 1-1, 3-20
Operating voltage, 1-11
Optional accessories, 1-7
Options, 1-5
Rename presets, 3-17
Reset, locked instrument controls, 2-1
Reset gain, 3-22
RGB/YRGB, Specification, A-7
RGB/YRGB staircase input, 3-23
Ordering accessories, 1-8
1740A/1750A Series Waveform/Vector Monitor User Manual
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Index
RS232 connector, 2-9, B-5
Sweep rates, 4-1
selecting, 2-5, 3-4
Sync jitter, 3-2
Sync tip, 3-18
S
Scale illumination, 3-24
SCH display, 2-5, 3-2
T
Television standard (NTSC/PAL), 1-1, 3-20
SCH phase measurements, 4-10
SCH Phase Mode, Specification, A-11
SCH R-Y, 3-7
Test mode, 3-18
Serial interface, B-5
Time Code, Specification, A-10
Time code display, 2-5, 3-3, 4-16
Timing cursors, 3-9
Servicing, 1-9
Set, instrument gain, 3-22
Setup, graticule, 4-2
Trace rotation, 3-24
Signal intensity, 1-15, 3-24
Software version, 3-23
Specification
U
Utility drawer (optional accessory), 1-8
Audio Mode, A-10
Calibrator, A-8
Certifications and compliances, A-13
CRT Display, A-11
Electrical, A-2
V
Vector display, 2-5, 3-1
Environmental Characteristics, A-12
External Reference, A-5
Measurement Cursors, A-7
Physical Characteristics, A-13
Power Source, A-12
Vector graticule, 4-7
Vector markers, 3-8
Vector Mode, Specification, A-8
Vertical Deflection, Specification, A-2
Vertical position control, 2-5
Viewing hood (optional accessory), 1-7
Voltage cursors, 3-9
RGB/YRGB, A-7
SCH Phase Mode, A-11
Time Code, A-10
Vector Mode, A-8
Waveform Horizontal Deflection, A-6
Waveform Vertical Deflection, A-2
Staircase, 3-23, B-1
W
Waveform cursors, 3-9
Waveform display, 2-5, 3-1
Waveform graticule, 4-1
Standard (NTSC/PAL), 1-1, 3-20
Standard accessories, 1-7
Standby mode, 1-10, 2-1
Stereo audio measurements, 4-15
Store presets, 3-17
Waveform Horizontal Deflection, Specifica-
tion, A-6
Waveform markers, 3-9
Subcarrier-to-horizontal phase, 3-2
Waveform Vertical Deflection, Specifica-
tion, A-3
I-4
1740A/1750A Series Waveform/Vector Monitor User Manual
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