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Table of Contents
Where to find more information.........................................................................................................................5
Software features................................................................................................................................................6
Configuring the hardware...................................................................................................................................9
Connectors, cables – main I/O connector.........................................................................................................................10
Screw terminal pin out – differential ...............................................................................................................................11
Screw terminal pin out – single-ended.............................................................................................................................12
Mechanical drawings........................................................................................................................................15
Input isolation...................................................................................................................................................20
Analog output terminals (VDAC0 through VDAC3).......................................................................................21
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OMB-DAQ-2416-4AO User's Guide
Specifications......................................................................................................................................25
Analog input.....................................................................................................................................................25
Compatible sensors..........................................................................................................................................................26
Thermocouple measurement accuracy.............................................................................................................................26
Input bandwidth...............................................................................................................................................................37
Noise performance...........................................................................................................................................................37
Channel switching error...................................................................................................................................................38
Analog input/output calibration........................................................................................................................41
Screw terminal pin out.....................................................................................................................................................44
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Preface
About this User's Guide
What you will learn from this user's guide
This user's guide explains how to install, configure, and use the OMB-DAQ-2416-4AO so that you get the most
out of its analog I/O, thermocouple (TC) input, digital I/O, and counter/timer I/O features.
This user's guide also refers you to related documents available on our web site, and to technical support
resources.
Conventions used in this user's guide
For more information on …
Text presented in a box signifies additional information and helpful hints related to the subject matter you are
reading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
< : >
Angle brackets that enclose numbers separated by a colon signify a range of numbers, such as those assigned
to registers, bit settings, etc.
bold text
Bold text is used for the names of objects on the screen, such as buttons, text boxes, and check boxes. For
example:
1. Insert the disk or CD and click the OK button.
italic text
Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase. For
example:
The InstaCal installation procedure is explained in the OMB-DAQ-2416 Series Software User’s Guide.
Never touch the exposed pins or circuit connections on the board.
Where to find more information
For additional information relevant to the operation of your hardware, refer to the Documents subdirectory
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Chapter 1
Introducing the OMB-DAQ-2416-4AO
Overview: OMB-DAQ-2416-4AO features
The OMB-DAQ-2416-4AO is supported under popular Microsoft® Windows® operating systems. The OMB-
DAQ-2416-4AO is a multifunction measurement and control board designed for the USB bus.
The OMB-DAQ-2416-4AO is a full-speed, multiplexed 24-bit measurement system that provides up to 16
differential and up to 32 single-ended (SE) analog inputs. It offers software-selectable analog input ranges of
±20 V, ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, ±0.312 V, ±0.156 V, and ±0.078 V.
It also protects your computer by providing a minimum of 500 VDC input isolation between field wiring and
the USB interface.
You can configure up to 16 of the analog inputs as differential thermocouple (TC) inputs. In thermocouple
mode, the OMB-DAQ-2416-4AO includes built-in cold-junction compensation and open thermocouple
detection.
You can add up to 32 single-ended or up to 16 differential channels by connecting the OMB-DAQ-2416-4AO
to an OMB-AI-EXP32 expansion module. Each channel is software-configurable as single-ended or differential.
For each channel pair configured differentially, you lose one SE channel.
The OMB-DAQ-2416-4AO has four 16-bit analog output channels with an update rate of up to1102 S/s and an
output range of ±10 V.
The device has eight high-speed lines of digital I/O and two 32-bit counters. You can expand up to 24 DIO
channels by connecting the OMB-DAQ-2416-4AO to an OMB-AI-EXP32 expansion module.
Six banks of removable screw-terminal blocks provide connectivity to the analog input channels, digital I/O
lines, counter/timer channels, and analog outputs.
Software features
For information on the features of InstaCal and the other software included with your OMB-DAQ-2416-4AO,
refer to the OMB-DAQ-2416 Series Software User’s Guide that shipped with your device.
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Chapter 2
Installing the OMB-DAQ-2416-4AO
What comes with your OMB-DAQ-2416-4AO shipment?
As you unpack your OMB-DAQ-2416-4AO, verify that the following components are included.
Hardware
.
OMB-DAQ-2416-4AO
.
.
USB cable (2-meter length)
OMB-DAQ-2416-ADAP (+5VDC, 10 Watt regulated power supply)
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OMB-DAQ-2416-4AO User's Guide
Installing the OMB-DAQ-2416-4AO
Optional components
Expansion devices that are compatible with the OMB-DAQ-2416-4AO must be ordered separately. If you
ordered any of the following products with your device, they should be included with your shipment:
.
OMB-AI-EXP32
Analog input expansion module adds up to 16 differential or 32 single-ended inputs to the OMB-DAQ-2416-
4AO.
Additional documentation
In addition to this hardware user's guide, you should also receive the OMB-DAQ-2416 Series Software User’s
Guide. This booklet supplies a brief description of the software you received with your OMB-DAQ-2416-4AO
and information regarding installation of that software. Please read this booklet completely before installing any
software or hardware.
Unpacking the OMB-DAQ-2416-4AO
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the OMB-DAQ-2416-4AO from its packaging, ground yourself using a wrist strap
or by simply touching the computer chassis or other grounded object to eliminate any stored static charge.
If any components are missing or damaged, notify Omega Engineering immediately by phone, fax, or e-mail.
.
.
.
Phone: (203) 359-1660
Fax: (203) 359-7700
Installing the software
Refer to the OMB-DAQ-2416 Series Software User’s Guide for instructions on installing the software on the
OMB-DAQ-2416 Series Data Acquisition Software CD. This booklet is available in PDF at
We recommend that you download the latest Windows Update onto your computer before installing and
operating the OMB-DAQ-2416-4AO.
Installing the hardware
To connect the OMB-DAQ-2416-4AO to your system, turn your computer on, and then do the following:
1. Connect the OMB-DAQ-2416-ADAP power supply to the device's external power connector, and plug the
other end into a power outlet.
2. Connect the USB cable to the device's USB connector and to a USB port on your computer. A USB2.0 port
is recommended.
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OMB-DAQ-2416-4AO User's Guide
Installing the OMB-DAQ-2416-4AO
When you connect the OMB-DAQ-2416-4AO for the first time, a Found New Hardware message opens as the
OMB-DAQ-2416-4AO is detected. When the message closes, the installation is complete.
The power LED (bottom LED) blinks during device detection and initialization, and then remains solid if
properly detected. If not, check if the OMB-DAQ-2416-4AO has sufficient power. When the device is first
powered on, there is usually a momentary delay before the power LED begins to blink, or come on solid.
Caution! Do not disconnect any device from the USB bus while the computer is communicating with the
OMB-DAQ-2416-4AO, or you may lose data and/or your ability to communicate with the OMB-
DAQ-2416-4AO.
Connecting to an OMB-AI-EXP32 with the DSUB37 expansion
connector
Use the 37-pin expansion connector to connect the OMB-DAQ-2416-4AO to an OMB-AI-EXP32 expansion
module.
To connect the two devices directly to each other, follow these steps.
1. Disconnect the USB cable from the OMB-DAQ-2416-4AO.
2. Remove the external power cable from the OMB-DAQ-2416-4AO.
3. Connect the two devices together by inserting the OMB-AI-EXP32's DSUB37 connector into the DSUB37
connector on the OMB-DAQ-2416-4AO.
Figure 1. OMB-DAQ-2416-4AO directly connected to an OMB-AI-EXP32
4. Turn the connected modules over and secure the connection by screwing the connection plate to both
modules, as shown below.
Figure 2. OMB-DAQ-2416-4AO secured to an OMB-AI-EXP32
5. Connect the external power supply to the OMB-DAQ-2416-4AO's external power connector, and plug the
other end into an AC outlet.
6. Connect the USB cable from the OMB-DAQ-2416-4AO to the host computer's USB port.
Connect to a USB 2.0 high speed hub to achieve the highest transfer rate (480 Mbps). When connected to a
USB 1.1 full-speed port, the transfer rate is limited to 12 Mbps.
Configuring the hardware
Except for the DIO pull-up selection, all hardware configuration options on the OMB-DAQ-2416-4AO are
software controlled. You can select some of the configuration options using InstaCal, such as the analog input
configuration (single-ended or differential channels). When measuring from thermocouples, make sure you
configure the channels for differential mode.
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Installing the OMB-DAQ-2416-4AO
Caution! Turn off power to all devices connected to the system before making connections. Electrical shock
or damage to equipment can result even under low-voltage conditions.
Caution! Always handle components carefully, and never touch connector terminals or circuit components
unless you are following ESD guidelines in an appropriate ESD-controlled area. These guidelines
include using properly-grounded mats and wrist straps, ESD bags and cartons, and related
procedures.
Avoid touching board surfaces and onboard components. Only handle boards by their edges. Make
sure the OMB-DAQ-2416-4AO does not come into contact with foreign elements such as oils,
water, and industrial particulate.
The discharge of static electricity can damage some electronic components. Semiconductor
devices are especially susceptible to ESD damage.
Connecting the board for I/O operations
Connectors, cables – main I/O connector
The following table lists the board connectors and compatible accessory products for the OMB-DAQ-2416-
4AO.
Main connector specifications
Main connectors
Six banks of detachable screw terminals
Compatible accessory product for the 37-pin expansion
connector
OMB-AI-EXP32 expansion board with screw terminals
(connects directly to the OMB-DAQ-2416-4AO)
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Installing the OMB-DAQ-2416-4AO
Screw terminal pin out – differential
No connection
Channel 0 HI
Channel 0 LO
No connection
No connection
Channel 1 HI
Channel 1 LO
No connection
No connection
Channel 2 HI
Channel 2 LO
No connection
No connection
Channel 3 HI
Channel 3 LO
No connection
NC
1
2
3
4
5
6
7
8
49
50
51
52
53
54
55
56
57
58
69
60
61
62
63
64
NC
No connection
CH0H
CH0L
NC
CH15L Channel 15 LO
CH15H Channel 15 HI
NC
NC
CH14L Channel 14 LO
CH14H Channel 14 HI
NC
NC
CH13L Channel 13 LO
CH13H Channel 13 HI
NC
NC
CH12L Channel 12 LO
CH12H Channel 12 HI
NC
No connection
No connection
NC
CH1H
CH1L
NC
No connection
No connection
NC
9
CH2H
CH2L
NC
10
11
12
13
14
15
16
No connection
No connection
NC
CH3H
CH3L
NC
No connection
No connection
Analog ground
Channel 4 HI
Channel 4 LO
No connection
No connection
Channel 5 HI
Channel 5 LO
No connection
No connection
Channel 6 HI
Channel 6 LO
No connection
No connection
Channel 7 HI
Channel 7 LO
NC
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
NC
GND
No connection
Analog ground
GND
CH4H
CH4L
NC
CH11L Channel 11 LO
CH11H Channel 11 HI
NC
NC
CH10L Channel 10 LO
CH10H Channel 10 HI
NC
No connection
No connection
NC
CH5H
CH5L
NC
No connection
No connection
Channel 9 LO
Channel 9 HI
No connection
No connection
Channel 8 LO
Channel 8 HI
NC
NC
CH6H
CH6L
NC
NC
CH7H
CH7L
CH9L
CH9H
NC
NC
CH8L
CH8H
No connection
No connection
+5 V output
Analog ground
Analog out 0
Analog out 1
Analog ground
Analog out 2
NC
NC
+5V
GND
VDAC0 37
VDAC1 38
GND
VDAC2 40
VDAC3 41
GND
CTR0
GND
CTR1
GND
NC
33
34
35
36
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
GND
NC
NC
Analog ground
No connection
No connection
Analog ground
GND
DIO7
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
DIO0
DGND
DGND
NC
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital I/O ground
Digital I/O ground
No connection
39
Analog out 3
Analog ground
Counter input 0
Analog ground
Counter input 1
Analog ground
No connection
No connection
42
43
44
45
46
47
48
NC
NC
No connection
Figure 3. 16-channel differential mode pin out
Differential connection guidelines
.
When connecting differential voltage inputs to a "floating" voltage source, make sure there is a DC return
path from each voltage input to ground. You make this path by connecting a resistor from each input to a
GND pin (pins 18, 36, 39, 42, 44, 46, 66, 81, 84). A value of approximately 100 kΩ can be used for most
applications.
Leave any unused input channels either floating or tied to GND (pins 18, 36, 39, 42, 44, 46, 66, 81, 84).
Source impedances should be kept as small as possible to avoid settling time and accuracy errors.
.
When configuring thermocouple sensors, keep any stray capacitance as small as possible relative to GND
(pins 18, 36, 39, 42, 44, 46, 66, 81, 84) to avoid settling time and accuracy errors. For thermocouple
channels, do not provide a return path to ground. This is done internally.
11
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Installing the OMB-DAQ-2416-4AO
Screw terminal pin out – single-ended
No connection
Channel 0
Channel 16
No connection
No connection
Channel 1
Channel 17
No connection
No connection
Channel 2
Channel 18
No connection
No connection
Channel 3
NC
1
2
3
4
5
6
7
8
49
50
51
52
53
54
55
56
57
58
69
60
61
62
63
64
NC
No connection
CH0H
CH0L
NC
CH15L Channel 31
CH15H Channel 15
NC
NC
CH14L Channel 30
CH14H Channel 14
NC
NC
CH13L Channel 29
CH13H Channel 13
NC
NC
CH12L Channel 28
CH12H Channel 12
NC
No connection
No connection
NC
CH1H
CH1L
NC
No connection
No connection
NC
9
CH2H
CH2L
NC
10
11
12
13
14
15
16
No connection
No connection
NC
CH3H
CH3L
NC
Channel 19
No connection
No connection
No connection
Analog ground
Channel 4
Channel 20
No connection
No connection
Channel 5
Channel 21
No connection
No connection
Channel 6
Channel 22
No connection
No connection
Channel 7
NC
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
NC
GND
No connection
Analog ground
GND
CH4H
CH4L
NC
CH11L Channel 27
CH11H Channel 11
NC
NC
CH10L Channel 26
CH10H Channel 10
NC
No connection
No connection
NC
CH5H
CH5L
NC
No connection
No connection
Channel 25
Channel 9
No connection
No connection
Channel 24
Channel 8
NC
NC
CH6H
CH6L
NC
NC
CH7H
CH7L
CH9L
CH9H
NC
NC
CH8L
CH8H
Channel 23
No connection
No connection
+5 V output
Analog ground
Analog out 0
Analog out 1
Analog ground
Analog out 2
NC
NC
+5V
GND
VDAC0 37
VDAC1 38
GND
VDAC2 40
VDAC3 41
GND
CTR0
GND
CTR1
GND
NC
33
34
35
36
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
GND
NC
NC
Analog ground
No connection
No connection
Analog ground
GND
DIO7
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
DIO0
DGND
DGND
NC
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital I/O ground
Digital I/O ground
No connection
39
Analog out 3
Analog ground
Counter input 0
Analog ground
Counter input 1
Analog ground
No connection
No connection
42
43
44
45
46
47
48
NC
NC
No connection
Figure 4. 32-channel single-ended mode pin out
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
Figure 5. DSUB37 expansion connector pin out
The OMB-AI-EXP32 expansion port is intended to interface directly with the OMB-DAQ-2416-4AO. Do not
attempt to use any of the expansion port pins for any other purpose.
Power down the OMB-DAQ-2416-4AO before you connect it the OMB-AI-EXP32 expansion board.
12
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Chapter 3
Functional Details
This chapter contains detailed information on all of the features available from the board, including:
.
.
.
.
Device components
Functional block diagram and mechanical drawings
Signal descriptions
Signal diagrams using default or conventional device settings
OMB-DAQ-2416-4AO components
.
.
.
.
.
One USB connector
One external power connector
Two LED indicators ("Power" and "Activity")
One 37-pin DSUB expansion connector
Six removable screw terminal blocks
Analog/TC input screw terminal blocks
· CH 0 – CH 7 differential
· CH 0 – CH 7, CH 16 - CH 23 SE
Analog output and counter
screw terminal blocks
External power
connector
USB
connector
Power
LED
Activity
LED
Figure 6. Front view components
Digital I/O screw
terminal blocks
37-pin
expansion connector
Analog/TC input screw terminal blocks
·
·
CH 8 - CH 15 differential
CH 8 - CH 31 single-ended
Figure 7. Rear view components
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OMB-DAQ-2416-4AO User's Guide
Functional Details
LEDs
When the OMB-DAQ-2416-4AO is connected to a computer, in its normal idle state both LEDs are lit solid
green.
Power LED
The Power LED is the top LED on the right side of the OMB-DAQ-2416-4AO housing.
The Power LED blinks when you plug the power supply into the OMB-DAQ-2416-4AO, and continues to blink
while the device initializes the hardware. If it continues blinking for more than ½ second, then there is a
problem with the OMB-DAQ-2416-4AO and you should cycle the power.
If an application issues a "blink LED" command, then the power LED blinks a few times.
Activity LED
The (USB) Activity LED is the bottom LED on the right side of the OMB-DAQ-2416-4AO housing. It blinks
rapidly when both the USB cable and external power cables are plugged in. It continues blinking rapidly while
the device is connecting to the computer, and then turns solid.
Whenever the device receives a USB command, the Activity LED blinks off and then returns to solid green.
When an analog in or analog out scan is running, the Activity LED blinks continuously.
USB connector
The USB connector provides communication.
External power connector
Connect the OMB-DAQ-2416-ADAP power supply to this connector. The power supply provides 5 VDC, 10W
regulated power.
Screw terminal wiring
The OMB-DAQ-2416-4AO has six groups of screw terminals—three on each side of the housing. Each group
14
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OMB-DAQ-2416-4AO User's Guide
Functional Details
Block diagram
Figure 10 shows a simplified block diagram of the OMB-DAQ-2416-4AO. This device provides all of the
functional elements shown in the figure.
Figure 10. OMB-DAQ-2416-4AO functional block diagram
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OMB-DAQ-2416-4AO User's Guide
Functional Details
Analog/TC input terminals
You can connect up to 32 single-ended analog input connections or up to 16 differential analog/TC input
connections to these screw terminal pins.
.
.
.
.
.
.
.
.
CH0H and CH0L
CH1H and CH1L
CH2H and CH2L
CH3H and CH3L
CH4H and CH4L
CH5H and CH5L
CH6H and CH6L
CH7H and CH7L
.
.
.
.
.
.
.
.
CH8H and CH8L
CH9H and CH9L
CH10H and CH10L
CH11H and CH11L
CH12H and CH12L
CH13H and CH13L
CH14H and CH14L
CH15H and CH15L
You can select a unique input range or signal type for each channel. For example, one channel could be used for
volts and another for temperature.
When connecting differential voltage inputs to a "floating" voltage source, make sure there is a DC return path
from each voltage input to ground. You make this path by connecting a resistor from each input to a GND pin
(pins 18, 36, 39, 42, 44, 46, 66, 81, 84). A value of approximately 100 kΩ can be used for most applications.
This does not apply to channels configured for thermocouple input, as they have their own internal reference.
Leave unused input channels either floating or tied to GND (pins 18, 36, 39, 42, 44, 46, 66, 81, 84).
Source impedances should be kept as small as possible to avoid settling time and accuracy errors.
Analog input mode
The OMB-DAQ-2416-4AO makes high-resolution voltage measurements in either a single-ended or fully
differential mode. You can configure the OMB-DAQ-2416-4AO for the following voltage input ranges.
.
.
.
.
.
.
.
.
.
±20 V
±10 V
±5 V
±2.5 V
±1.25 V
±0.625 V
±0.3125 V
±0.15625 V
±0.078125 V
Each analog input channel has the following measurement parameters:
.
.
signal type of volts or thermocouple type J, K, T, E, R, S, B, or N
full scale voltage from -20 to + 20 VDC
Thermocouple inputs
You can make up to 16 high-resolution differential thermocouple measurements with the OMB-DAQ-2416-
4AO. Built-in cold-junction sensors are provided for each of the screw-terminal blocks, and any supported TC
type can be attached to any of the 16 thermocouple channels.
Do not connect thermocouples as single-ended—doing so can cause false readings.
You do not need to use ground-referencing resistors because the analog front-end circuit level-shifts the
thermocouple's output into the common-mode input range of the A/D.
When configuring thermocouple sensors, keep any stray capacitance as small as possible relative to GND
(pins 18, 36, 39, 42, 44, 46, 66, 81, 84) to avoid settling time and accuracy errors.
17
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Functional Details
The OMB-DAQ-2416-4AO also provides an open thermocouple detection (OTD) feature for each of the analog
input channels configured for thermocouple measurement. This feature is automatically enabled as part of the
overall acquisition process, and detects if an open-circuit condition exists at the thermocouple sensor.
The OMB-DAQ-2416-4AO provides electrostatic discharge (ESD) protection for each of the thermocouple
inputs. However, before handling thermocouple sensors, follow standard ESD practices and discharge any
accumulated ESD charge.
The OMB-DAQ-2416-4AO includes an ESD protection device at each of the analog input terminal block pins.
If an ESD or transient voltage is coupled into the device, the input protection device(s) clamps the voltage to
protect the thermocouple input circuitry from possible damage.
Once the thermocouple sensor is connected to the OMB-DAQ-2416-4AO, the configuration options have been
selected, and the recommended 45 minute warm up has elapsed, the OMB-DAQ-2416-4AO is ready to make
high-resolution differential voltage measurements.
Cold junction compensation (CJC) is needed to compensate for the additional thermal EMF's generated by
connecting the thermocouple leads to the OMB-DAQ-2416-4AO terminal blocks.
CJC is performed using a high-resolution temperature sensor connected close to the OMB-DAQ-2416-4AO's
terminal blocks. The OMB-DAQ-2416-4AO includes four separate CJC sensors—two on each side of the PCB.
Software corrects for the additional thermocouples created at the terminal.
Once the A/D and CJC data is collected, the application software uses this data to linearize to an accurate
temperature reading. The thermocouple linearization uses the latest NIST linearization coefficients for each of
the eight thermocouple types supported by the OMB-DAQ-2416-4AO.
Figure 11 below shows a typical thermocouple connection.
Figure 11. Differential thermocouple connection example
Noise filtering, data rate, and throughput rate
Although the OMB-DAQ-2416-4AO's A/D converter has a maximum data rate of 3,750 samples per second,
the actual throughput rate you observe for voltage and temperature data is determined by these formulas.
.
Maximum single-channel throughput:
1
1
data rate
640
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.
Maximum multiple-channel throughput:
1
1
640 μs
data rate
n
where n is the number of channels
Refer to the tables in the Throughput rate section of the Specifications chapter for details.
This drop-off in throughput rate is due to the OMB-DAQ-2416-4AO's noise filtering feature. You can control
the amount of the noise filtering by adjusting the data rate setting. By reducing the data rate, the averaging of
samples increases, and noise drops correspondingly.
Figure 12 below illustrates this inverse relationship. This graph applies to the A/D converter only—do not
expect this level of performance from the OMB-DAQ-2416-4AO itself.
Figure 12. OMB-DAQ-2416-4AO A/D converter data rate vs. noise graph
If low noise is your main concern, you can operate the OMB-DAQ-2416-4AO at very low data rates starting
from 2.5 S/s. At low rates, much of the noise is averaged out of the data, and issues such as reference noise
become less important.
At higher data rates, higher-frequency noise sources are not averaged out and begin to be troublesome. These
noise sources include the noise inherent in the A/D converter itself, which is not reducible.
Since thermocouples can pick up noise in your environment, select a data rate based on the primary noise
frequency. For example, to reduce the effect of 60 Hz noise, select a data rate of 60 (or a sub-multiple of 60,
such as 10 or 20).
Multiple-channel throughput rates
When setting different sample rates for different channels, be aware that the all channels will be sampled within
the same sample window based on the channel with the lowest sample rate.
For example, if you set a 10 Hz data rate for channel 0, and a 50 Hz data rate for channel 1, basically, both
channels pass the same number of samples per second to the host computer. However, more averaging is
performed on channel 0's samples; therefore, channel 0 is sampled at a higher resolution.
The OMB-DAQ-2416-4AO's A/D converter performs averaging, and the number of averages equals
30,000/data rate.
In this example, channel 0 is sampled 3000 times over 100 ms, and all samples are averaged into one sample.
Then, channel 1 is sampled 600 times over 20 ms, and samples are likewise averaged into one sample.
The final samples are available to you at a maximum rate of about 8 Hz (8.245 Hz).
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Resolution = 19.6 bits
Resolution = 20.6 bits
640 µs delay before
next sample taken
Figure 13. OMB-DAQ-2416-4AO data rate vs. resolution example
Input isolation
The OMB-DAQ-2416-4AO is an isolated data acquisition device. The analog I/O, digital I/O, counters, and all
the digital control/timing are referenced to an isolated ground as shown in the figure below. This ground is
physically and electrically separate from the ground use by the circuit connected to the system bus interface.
Isolation provides a barrier between the host PC and potentially hazardous voltages by physically and
electrically separating two parts of the measurement device.
.
.
The "non-isolated" ground is common to the chassis ground of the PC, while the "isolated" ground is not.
Isolation
barrier
I/O connector
AIN/TIN
Aout
Non-
isolated
µC
Isolated
µC
Digital
isolator
USB
DIO
Counters
Isolated
ground
Non--isolated
ground
DSUB-37
connector
(OMB-AI-EXP32)
Figure 14. OMB-DAQ-2416-4AO input isolation diagram
When making measurements in industrial environments, DAQ devices can encounter hazardous voltages,
transients, large common mode voltages and fluctuating ground potentials. Any one of these issues can
seriously degrade the measurement accuracy of the device and possibly damage the measurement instrument.
To overcome these issues, some DAQ devices provide physical and electrical isolation. Some of the benefits of
isolation include:
.
.
Safety: A DAQ device employing physical and electrical isolation helps to keep high voltages and
transients from damaging the system-side host PC.
Ground loops: Improper grounding of the signal source that the DAQ device is measuring is one of the
most common sources of noise and measurement inaccuracies. Isolation improves the measurement
accuracy by physically preventing ground loops. Ground loops—a common source of noise and error—are
the results of a measurement system having multiple grounds at different potentials.
.
Common mode rejection: With isolation, a DAQ device can measure small signals in the presence of
large common mode voltages. Isolation increases the measurement system's ability to reject common mode
voltages. The common mode voltage is the signal that is common to both the positive and negative inputs
of the measurement device, but is not part of the signal to measure.
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Analog output terminals (VDAC0 through VDAC3)
The OMB-DAQ-2416-4AO has four 16-bit analog output channels with a ±10 V output range.
Analog outputs can be updated at a maximum rate of 1000 samples per second (S/s).
Digital I/O
Up to eight digital I/O lines are available in each OMB-DAQ-2416-4AO.
Digital input voltage ranges of 0 to +15V are permitted, with thresholds of 0.6 V (low) and 2.6 V (high). Each
DIO channel is an open-drain, which, when used as an output, is capable of sinking up to 150 mA for direct
drive applications. The maximum sink current is 150 mA per 8-channel bank, or if all eight channels are used,
18 mA (maximum) per channel.
Figure 15 represents a typical DIO connection for one channel. The other seven channels are connected in the
same manner.
Figure 15. Digital output connection example
Internal pull-up/pull-down capability
Each of the eight DIO bits on the OMB-DAQ-2416-4AO has a 47 kΩ pull-up/pull-down resistor. The pull-
up/pull-down voltage is common to all of the internal 47 kΩ resistors.
All pins are pulled up to +5V by default. To configure these bits for the 0V pull-down option, open the OMB-
DAQ-2416-4AO case to access the three-pin jumper labeled JP1.
To open the case and set the JP1 jumper, do the following.
1. Turn over the OMB-DAQ-2416-4AO and rest it on its top on a flat, stable surface.
3. Holding both the top and bottom sections of the module, turn it back over, rest it on the surface, and
carefully remove the top portion of the case.
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Figure 16. Location of screws connecting bottom and top sections of case
Figure 17. Location of JP1
4. To pull the digital pins down to ground, place the shorting block across pins 2 and 3 (refer to the jumper
orientation shown in Figure 17).
To pull the digital pins up to +5V, place the shorting block across pins 1 and 2.
External pull-up/pull-down capability
You can also place an external pull-up resistor on any of the DIO bits, which enables you to pull the DIO bit up
to a voltage that exceeds the internal +5 V pull-up voltage.
When using external pull-up resistors, be aware of the following:
.
.
You should either remove the JP1 jumper, or store it by attaching it to one of the three pins.
When using external pull-up resistors, the internal resistors cause slight impedance shifts to digital lines in
the "on" state as the number of lines in the "off" state changes.
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+ V
+5 V
JP1
47 kΩ
Internal jumper
disabled (placed on
center pin only)
External pull-up resistor
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
Figure 18. Digital I/O external resistor configuration
Counter input terminals (CTR0, CTR1)
Two 32-bit event counters are built into the OMB-DAQ-2416-4AO. Each counter accepts frequency inputs up
to 1 MHz.
Refer to the "Screw terminal pin out" diagrams starting on page 11 for the location of these pins. The internal
counter increments when the TTL levels transition from low to high. The counter can count frequencies of up to
1 MHz.
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Chapter 4
Calibrating the OMB-DAQ-2416-4AO
The OMB-DAQ-2416-4AO is initially calibrated using an NIST-traceable calibration method. This method
stores a correction factor for each AIN and AOUT range in non-volatile memory on the device at the time of
calibration.
Allow a 45 minute warm-up period before calibrating the OMB-DAQ-2416-4AO.
Calibration methods
Factory calibration
You can return the OMB-DAQ-2416-4AO once a year to Omega Engineering for a new factory calibration and
calibration certificate.
Self calibration
Use InstaCal to calibrate the OMB-DAQ-2416-4AO whenever the ambient temperature changes by more than
±10 °C from the last self-calibration
You can perform this procedure with thermocouple and voltage inputs connected to the input terminal blocks.
To calibrate the AOUT circuits, disconnect the analog outputs at the terminal block pins to ensure optimum
calibration results.
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Chapter 5
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
All specifications apply to all temperature and voltage input channels unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. General analog input specifications
Parameter
Conditions
Specification
A/D converter type
A/D data rates
ADS1256, 24-bit Sigma Delta
3750 samples per second (S/s), 2000 S/s, 1000 S/s, 500 S/s, 100 S/s,
60 S/s, 50 S/s, 25 S/s, 10 S/s, 5 S/s, 2.5 S/s
. Single channel: 2.5 Hz to 1102.94 Hz, software selectable
. Multiple channels: 0.16 Hz to 1102.94 Hz, software selectable
Throughput
Number of channels
Up to 32 channels individually software-configurable as single-
ended or differential
Thermocouples require differential mode. For each channel
configured as differential, you essentially lose one single-ended
channel. You can add channels by connecting to an
OMB-AI-EXP32.
Input isolation
500 VDC minimum between field wiring and USB interface
Channel configurations
Temperature sensor input, s/w programmable to match sensor type
Voltage input
±0.078125 V
Input voltage range
Thermocouple mode
Voltage mode (Note 1)
±20 V, ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, ±0.3125 V,
±0.15625 V, ±0.078125 V, software-configurable
. ±30 V maximum (power on)
. ±10 V maximum (power off)
Absolute maximum
input voltage
CxH-CxL relative to
GND
. 2 GΩ (power on)
. 390Ω (power off)
Input impedance
Input leakage current
±10.6 nA
. Input voltage >±30 V
(power on/off)
±1 µA maximum
Input capacitance
590 pf
Maximum working
voltage (signal +
common mode)
Voltage mode: ±20 V
range
±20.01 V maximum
Voltage mode: all other
voltage input ranges
±10.25 V maximum
110 dB
Common mode
Thermocouple mode,
rejection ratio (Note 1) (fIN = 60 Hz)
Voltage mode,(fIN
=
90 dB
60 Hz, all input ranges)
Adjacent channels
Up to 64 elements
ADC resolution
Crosstalk
24 bits
100 dB
Input coupling
Channel gain queue
Warm-up time
DC
Software-configurable channel and range
45 minutes minimum
Open thermocouple
detect
Automatically enabled when the channel is configured for a
thermocouple sensor.
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Specifications
Parameter
Conditions
Specification
CJC sensor accuracy
15 °C to 35 °C
0 °C to 55 °C
±0.15 °C typical
±0.5 °C maximum
Note 1: Placing a notch of the A/D digital filter at 60 Hz (setting A/D data rate = 60 S/s, 10 S/s, 5 S/s or
2.5 S/s) further improves the common mode rejection of this frequency.
Channel configurations
When any item is changed, the firmware stores channel configurations in the EEPROM of the isolated
microcontroller. An external application issues commands over the USB to make changes, and the configuration
is made non-volatile through the use of the EEPROM.
When connecting differential voltage inputs to a floating voltage source, provide a DC return path from each
voltage input to ground. To do this, connect a resistor from each input to a GND pin (pins 18, 36, 39, 42, 44, 46,
66, 81, 84). A value of approximately 100 kΩ can be used for most applications.
Leave unused input channels either floating or tied to GND (pins 18, 36, 39, 42, 44, 46, 66, 81, 84).
Source impedances should be kept as small as possible to avoid settling time and accuracy errors.
For each voltage/thermocouple channel configured as differential, you essentially lose one single-ended
channel. You can add channels by connecting to an OMB-AI-EXP32.
Table 2. Channel configurations
Channel Category
Specification
CxH/CxL Thermocouple 16 differential channels
CxH/CxL Voltage
CxH/CxL Voltage
32 individually-configurable channels that can be configured as either single-ended or
differential.
Compatible sensors
Table 3. Compatible sensor type specifications
Parameter
Conditions
Thermocouple
J: -210 °C to 1200 °C
K: -270 °C to 1372 °C
R: -50 °C to 1768 °C
S: -50 °C to 1768 °C
T: -270 °C to 400 °C
N: -270 °C to 1300 °C
E: -270 °C to 1000 °C
B: 0 °C to 1820 °C
Accuracy
Thermocouple measurement accuracy
Thermocouple measurement accuracy specifications include polynomial linearization error, cold-junction
compensation measurement error, and system noise. These specs are for one year, or 3000 operating hours,
whichever comes first.
There is a CJC sensor for each terminal block of the module. The accuracy listed below assumes the screw
terminals are at the same temperature as the CJC sensor.
The accuracy errors shown do not include the inherent accuracy error of the thermocouple sensor itself. Contact
your thermocouple supplier for details on the actual thermocouple sensor accuracy limitations.
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Specifications
Connect thermocouples to the OMB-DAQ-2416-4AO such that they are floating with respect to GND (pins 18,
36, 39, 42, 44, 46, 66, 81, 84, 93, and 94).
When configuring thermocouple sensors, keep any stray capacitance relative to GND (pins 18, 36, 39, 42, 44,
46, 66, 81, 84) as small as possible to avoid settling time and accuracy errors.
The OMB-DAQ-2416-4AO GND and DGND pins are isolated from earth ground. You can connect
thermocouple sensors to voltages referenced to earth ground as long as isolation between the GND/DGND pins
and earth ground is maintained.
Table 4. J type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data rate
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
Sensor temperature range
Accuracy error
maximum
Accuracy error
typical
Tempco
(°C/°C)
-210 °C
0 °C
2.572 °C
0.935 °C
1.869 °C
2.572 °C
0.935 °C
1.869 °C
2.572 °C
0.935 °C
1.869 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
1.416 °C
0.469 °C
1.456 °C
1.416 °C
0.469 °C
1.456 °C
1.416 °C
0.469 °C
1.456 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
0.022
0.022
0.022
0.022
0.022
0.022
0.022
0.022
0.022
0.022
0.022
1200 °C
-210 °C
0 °C
1200 °C
-210 °C
0 °C
1200 °C
-210 °C
0 °C
1200 °C
-210 °C
0 °C
1200 °C
-210 °C
0 °C
1200 °C
-210 °C
0 °C
50 S/s
1200 °C
-210 °C
0 °C
25 S/s
1200 °C
-210 °C
0 °C
10 S/s
1200 °C
-210 °C
0 °C
5 S/s
1200 °C
-210 °C
0 °C
2.5 S/s
1200 °C
To achieve the thermocouple accuracies listed above, the OMB-DAQ-2416-4AO should be warmed up for
45 minutes after the initial power on. The accuracies listed above are only guaranteed if the OMB-DAQ-2416-
4AO is housed in its plastic enclosure.
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Table 5. K type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data
rate
Sensor temperature
range
Accuracy error
maximum
Accuracy error
typical
Tempco
(°C/°C)
-210 °C
0 °C
2.917 °C
1.017 °C
2.478 °C
2.917 °C
1.017 °C
2.478 °C
2.917 °C
1.017 °C
2.478 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
1.699 °C
0.526 °C
2.022 °C
1.699 °C
0.526 °C
2.022 °C
1.699 °C
0.526 °C
2.022 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
0.029
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
1372 °C
-210 °C
0 °C
0.029
0.029
0.029
0.029
0.029
0.029
0.029
0.029
0.029
0.029
1372 °C
-210 °C
0 °C
1372 °C
-210 °C
0 °C
1372 °C
-210 °C
0 °C
1372 °C
-210 °C
0 °C
1372 °C
-210 °C
0 °C
50 S/s
1372 °C
-210 °C
0 °C
25 S/s
1372 °C
-210 °C
0 °C
10 S/s
1372 °C
-210 °C
0 °C
5 S/s
1372 °C
-210 °C
0 °C
2.5 S/s
1372 °C
To achieve the thermocouple accuracies listed above, the OMB-DAQ-2416-4AO should be warmed up for
45 minutes after the initial power on. The accuracies listed above are only guaranteed if the OMB-DAQ-2416-
4AO is housed in its plastic enclosure.
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Table 6. N type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data
rate
Sensor
temperature range
Accuracy error maximum
Accuracy error
typical
Tempco
(°C/°C)
0.029
-200 °C
0 °C
3.480°C
1.201 °C
1.991 °C
3.480°C
1.201 °C
1.991 °C
3.480°C
1.201 °C
1.991 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
2.030 °C
0.659 °C
1.600 °C
2.030 °C
0.659 °C
1.600 °C
2.030 °C
0.659 °C
1.600 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
1300 °C
-200 °C
0 °C
0.029
0.029
0.029
0.029
0.029
0.029
0.029
0.029
0.029
0.029
1300 °C
-200 °C
0 °C
1300 °C
-200 °C
0 °C
1300 °C
-200 °C
0 °C
1300 °C
-200 °C
0 °C
1300 °C
-200 °C
0 °C
50 S/s
1300 °C
-200 °C
0 °C
25 S/s
1300 °C
-200 °C
0 °C
10 S/s
1300 °C
-200 °C
0 °C
5 S/s
1300 °C
-200 °C
0 °C
2.5 S/s
1300 °C
To achieve the thermocouple accuracies listed above, the OMB-DAQ-2416-4AO should be warmed up for
45 minutes after the initial power on. The accuracies listed above are only guaranteed if the OMB-DAQ-2416-
4AO is housed in its plastic enclosure.
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Specifications
Table 7. R type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data rate Sensor
temperature range
Accuracy error
maximum
Accuracy error
typical
Tempco
(°C/°C)
0.082
-50 °C
4.826 °C
2.117 °C
2.842 °C
4.826 °C
2.117 °C
2.842 °C
4.826 °C
2.117 °C
2.842 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
3.133 °C
1.424 °C
2.347 °C
3.133 °C
1.424 °C
2.347 °C
3.133 °C
1.424 °C
2.347 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
250 °C
1768 °C
-50 °C
0.082
0.082
0.082
0.082
0.082
0.082
0.082
0.082
0.082
0.082
250 °C
1768 °C
-50 °C
250 °C
1768 °C
-50 °C
250 °C
1768 °C
-50 °C
250 °C
1768 °C
-50 °C
250 °C
1768 °C
-50 °C
50 S/s
250 °C
1768 °C
-50 °C
25 S/s
250 °C
1768 °C
-50 °C
10 S/s
250 °C
1768 °C
-50 °C
5 S/s
250 °C
1768 °C
-50 °C
2.5 S/s
250 °C
1768 °C
To achieve the thermocouple accuracies listed above, the OMB-DAQ-2416-4AO should be warmed up for
45 minutes after the initial power on. The accuracies listed above are only guaranteed if the OMB-DAQ-2416-
4AO is housed in its plastic enclosure.
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Specifications
Table 8. S type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data rate Sensor
temperature range
Accuracy error
maximum
Accuracy error
typical
Tempco
(°C/°C)
0.088
0.088
0.088
0.088
0.088
0.088
0.088
0.088
0.088
0.088
0.088
-50 °C
4.510 °C
2.165 °C
3.187 °C
4.510 °C
2.165 °C
3.187 °C
4.510 °C
2.165 °C
3.187 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
2.930 °C
1.468 °C
2.597 °C
2.930 °C
1.468 °C
2.597 °C
2.930 °C
1.468 °C
2.597 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
250 °C
1768 °C
-50 °C
250 °C
1768 °C
-50 °C
250 °C
1768 °C
-50 °C
250 °C
1768 °C
-50 °C
250 °C
1768 °C
-50 °C
250 °C
1768 °C
-50 °C
50 S/s
250 °C
1768 °C
-50 °C
25 S/s
250 °C
1768 °C
-50 °C
10 S/s
250 °C
1768 °C
-50 °C
5 S/s
250 °C
1768 °C
-50 °C
2.5 S/s
250 °C
1768 °C
To achieve the thermocouple accuracies listed above, the OMB-DAQ-2416-4AO should be warmed up for
45 minutes after the initial power on. The accuracies listed above are only guaranteed if the OMB-DAQ-2416-
4AO is housed in its plastic enclosure.
31
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OMB-DAQ-2416-4AO User's Guide
Specifications
Table 9. B type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data rate Sensor
temperature range
Accuracy error
maximum
Accuracy error
typical
Tempco
(°C/°C)
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
5.489 °C
2.283 °C
2.202 °C
5.489 °C
2.283 °C
2.202 °C
5.489 °C
2.283 °C
2.202 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
3.956 °C
1.743 °C
1.842 °C
3.956 °C
1.743 °C
1.842 °C
3.956 °C
1.743 °C
1.842 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
50 S/s
25 S/s
10 S/s
5 S/s
2.5 S/s
To achieve the thermocouple accuracies listed above, the OMB-DAQ-2416-4AO should be warmed up for
45 minutes after the initial power on. The accuracies listed above are only guaranteed if the OMB-DAQ-2416-
4AO is housed in its plastic enclosure.
32
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Specifications
Table 10. E type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data
rate
Sensor temperature
range
Accuracy error
maximum
Accuracy error typical
Tempco
(°C/°C)
-200 °C
0 °C
2.413 °C
1.069 °C
1.575 °C
2.413 °C
1.069 °C
1.575 °C
2.413 °C
1.069 °C
1.575 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
1.352 °C
0.551 °C
1.211 °C
1.352 °C
0.551 °C
1.211 °C
1.352 °C
0.551 °C
1.211 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
0.017
0.017
0.017
0.017
0.017
0.017
0.017
0.017
0.017
0.017
0.017
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
1000 °C
-200 °C
0 °C
1000 °C
-200 °C
0 °C
1000 °C
-200 °C
0 °C
1000 °C
-200 °C
0 °C
1000 °C
-200 °C
0 °C
1000 °C
-200 °C
0 °C
50 S/s
1000 °C
-200 °C
0 °C
25 S/s
1000 °C
-200 °C
0 °C
10 S/s
1000 °C
-200 °C
0 °C
5 S/s
1000 °C
-200 °C
0 °C
2.5 S/s
1000 °C
To achieve the thermocouple accuracies listed above, the OMB-DAQ-2416-4AO should be warmed up for
45 minutes after the initial power on. The accuracies listed above are only guaranteed if the OMB-DAQ-2416-
4AO is housed in its plastic enclosure.
33
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Specifications
Table 11. T type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data rate Sensor
temperature range
Accuracy error
maximum
Accuracy error
typical
Tempco
(°C/°C)
-200 °C
0 °C
2.821 °C
1.050 °C
0.957 °C
2.821 °C
1.050 °C
0.957 °C
2.821 °C
1.050 °C
0.957 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
1.676 °C
0.558 °C
0.595 °C
1.676 °C
0.558 °C
0.595 °C
1.676 °C
0.558 °C
0.595 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
0.027
0.027
0.027
0.027
0.027
0.027
0.027
0.027
0.027
0.027
0.027
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
400 °C
-200 °C
0 °C
400 °C
-200 °C
0 °C
400 °C
-200 °C
0 °C
400 °C
-200 °C
0 °C
400 °C
-200 °C
0 °C
400 °C
-200 °C
0 °C
50 S/s
400 °C
-200 °C
0 °C
25 S/s
400 °C
-200 °C
0 °C
10 S/s
400 °C
-200 °C
0 °C
5 S/s
400 °C
-200 °C
0 °C
2.5 S/s
400 °C
To achieve the thermocouple accuracies listed above, the OMB-DAQ-2416-4AO should be warmed up for
45 minutes after the initial power on. The accuracies listed above are only guaranteed if the OMB-DAQ-2416-
4AO is housed in its plastic enclosure.
34
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Specifications
Analog input DC voltage measurement accuracy
Table 12. DC Accuracy components and specifications. All values are (±)
Range
A/D
data
rate
Gain error Offset
INL
Absolute
Gain
Offset
(% of
error
error (% accuracy
of
range)
temperature
coefficient (%
reading/°C)
temperature
coefficient
(µV/°C)
reading)
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.003
0.003
0.003
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.0015
0.0015
0.0015
0.0015
0.0015
0.0015
0.0015
0.0015
0.0025
98 µV
61 µV
27 µV
12 µV
11 µV
15 µV
12 µV
12 µV
13 µV
14 µV
14 µV
42 µV
36 µV
15 µV
7 µV
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
857.600 µV
821.185 µV
787.226 µV
772.193 µV
771.014 µV
774.689 µV
771.603 µV
772.070 µV
773.400 µV
773.579 µV
773.537 µV
421.600 µV
416.004 µV
395.252 µV
387.216 µV
288.470 µV
290.090 µV
287.719 µV
285.672 µV
285.982 µV
286.003 µV
286.086 µV
210.800 µV
210.712 µV
198.254 µV
146.499 µV
147.285 µV
148.216 µV
146.196 µV
145.996 µV
145.820 µV
145.817 µV
145.810 µV
83.000 µV
83.062 µV
79.487 µV
66.232 µV
66.685 µV
67.014 µV
65.314 µV
65.901 µV
65.759 µV
65.800 µV
65.769 µV
48.050 µV
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
2
2
2
2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
±20 V
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
50 S/s
25 S/s
10 S/s
5 S/s
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
±10 V
8 µV
10 µV
8 µV
50 S/s
6 µV
25 S/s
6 µV
10 S/s
6 µV
5 S/s
6 µV
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
21 µV
21 µV
8 µV
±5 V
6 µV
7 µV
8 µV
6 µV
50 S/s
6 µV
25 S/s
6 µV
10 S/s
6 µV
5 S/s
6 µV
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
13 µV
13 µV
9 µV
±2.5 V
9 µV
9 µV
10 µV
8 µV
50 S/s
8 µV
25 S/s
8 µV
10 S/s
8 µV
5 S/s
8 µV
2.5 S/s
3750 S/s
7 µV
±1.25 V
35
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Specifications
Range
A/D
data
rate
Gain error Offset
INL
Absolute
Gain
Offset
(% of
error
error (% accuracy
of
range)
temperature
coefficient (%
reading/°C)
temperature
coefficient
(µV/°C)
reading)
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.003
0.003
0.003
0.003
0.003
0.002
0.002
0.002
0.002
0.002
0.002
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.035
0.035
0.035
0.035
0.035
9 µV
8 µV
8 µV
8 µV
8 µV
8 µV
8 µV
8 µV
8 µV
8 µV
7 µV
7 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
7 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0008
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0005
0.0009
0.0009
0.0009
0.0009
0.0009
50.632 µV
49.359 µV
49.709 µV
49.604 µV
49.417 µV
49.610 µV
49.584 µV
49.482 µV
49.489 µV
49.489 µV
28.775 µV
28.679 µV
27.762 µV
28.167 µV
28.088 µV
21.709 µV
21.773 µV
21.746 µV
21.927 µV
21.803 µV
21.784 µV
24.500 µV
23.443 µV
23.086 µV
23.094 µV
23.084 µV
23.288 µV
23.232 µV
23.191 µV
23.125 µV
23.182 µV
23.127 µV
15.856 µV
15.793 µV
15.902 µV
16.118 µV
15.877 µV
16.014 µV
16.122 µV
15.903 µV
15.927 µV
15.981 µV
15.979 µV
33.547 µV
34.252 µV
33.696 µV
34.002 µV
34.005 µV
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
50 S/s
25 S/s
10 S/s
5 S/s
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
±0.625 V
50 S/s
25 S/s
10 S/s
5 S/s
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
±0.3125 V
50 S/s
25 S/s
10 S/s
5 S/s
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
±0.15625 V
50 S/s
25 S/s
10 S/s
5 S/s
2.5 S/s
±0.078125 V 3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
36
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Specifications
Range
A/D
data
rate
Gain error Offset
INL
Absolute
Gain
Offset
(% of
error
error (% accuracy
of
range)
temperature
coefficient (%
reading/°C)
temperature
coefficient
(µV/°C)
reading)
0.035
0.035
0.035
0.035
0.035
0.035
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
0.0009
0.0009
0.0009
0.0009
0.0009
0.0009
33.866 µV
34.026 µV
33.933 µV
33.937 µV
33.969 µV
33.934 µV
0.0006
0.0006
0.0006
0.0006
0.0006
0.0006
1
1
1
1
1
1
60 S/s
50 S/s
25 S/s
10 S/s
5 S/s
2.5 S/s
Input bandwidth
Table 13. input bandwidth
A/D data rate
-3 dB Bandwidth (Hz)
1615
878
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
441
221
44.2
26.5
22.1
11.1
4.42
2.21
1.1
50 S/s
25 S/s
10 S/s
5 S/s
2.5 S/s
Noise performance
For the peak-to-peak noise distribution test, a differential input channel is connected to GND at the input
terminal block, and 50,000 samples are acquired at the maximum rate available at each setting.
Table 14. Peak-to-peak noise performance specifications (µV)
A/D data rate
Range
3750 S/s 2000 S/s 1000 S/s 500 S/s 100 S/s 60 S/s 50 S/s 25 S/s 10 S/s 5 S/s
2.5 S/s
230.31
126.84
56.74
32.96
18.57
18.88
15.33
13.28
13.47
186.92
100.14
47.56
28.79
17.52
16.58
14.76
16.84
15.02
126.84
71.76
34.21
17.94
13.83
8.45
100.14
45.06
25.87
14.19
9.30
57.22
30.52
16.21
7.51
5.48
5.32
4.75
5.70
4.28
57.22
30.52
14.31
7.09
5.48
4.80
4.69
4.48
4.16
49.59
26.70
14.31
7.09
5.01
4.38
4.49
4.48
4.00
47.58
19.07
14.30
5.72
3.81
3.86
3.70
4.24
3.57
23.84 23.84 14.31
±20 V
11.92
5.96
3.81
3.34
2.50
3.34
2.66
2.28
9.54
4.77
2.86
3.34
2.61
2.56
3.07
2.13
9.54
4.77
2.38
2.86
1.98
2.45
2.29
2.40
±10 V
±5 V
±2.5 V
±1.25 V
±0.625 V
±0.3125 V
±0.15625 V
±0.078125 V
7.41
8.19
6.94
7.47
6.61
9.17
6.88
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Table 15. RMS noise performance specifications (µVRMS)
A/D data rate
Range
3750 S/
s
2000 S/
s
1000 S/
s
500 S/
s
100 S/
s
60 S/
s
50 S/
s
25 S/
s
10 S/
s
5 S/
s
2.5 S/
s
±20 V
34.90
19.22
8.60
4.99
2.81
2.86
2.32
2.01
28.32
15.17
7.21
4.36
2.66
2.51
2.24
2.55
19.22
10.87
5.18
2.72
2.10
1.28
1.24
1.13
15.17
6.83
3.92
2.15
1.41
1.12
1.05
1.00
8.67
4.62
2.46
1.14
0.83
0.81
0.72
0.86
8.67
4.62
2.17
1.07
0.83
0.73
0.71
0.68
7.51
4.05
2.17
1.07
0.76
0.66
0.68
0.68
7.22
2.89
2.16
0.87
0.58
0.58
0.56
0.64
3.61
1.81
0.90
0.58
0.51
0.38
0.51
0.40
3.61
2.17
1.44
0.72
0.36
0.43
0.30
0.37
0.35
±10 V
1.44
0.72
0.43
0.51
0.40
0.39
0.47
±5 V
±2.5 V
±1.25 V
±0.625 V
±0.3125 V
±0.15625 V
±0.078125
V
2.04
2.28
1.39
1.04
0.65
0.63
0.60
0.54
0.35
0.32
0.36
Table 16. Noise-free resolution specifications (bits)
A/D data rate
Range
3750 S/
s
2000 S/
s
1000 S/
s
500 S/
s
100 S/
s
60 S/
s
50 S/
s
25 S/
s
10 S/
s
5 S/
s
2.5 S/
s
±20 V
17.4
17.2
17.4
17.2
17.0
16.0
15.3
14.5
17.7
17.6
17.6
17.4
17.1
16.2
15.3
14.1
18.2
18.1
18.1
18.1
17.4
17.1
16.2
15.3
18.6
18.7
18.5
18.4
18.0
17.3
16.4
15.5
19.4
19.3
19.2
19.3
18.8
17.8
17.0
15.7
19.4
19.3
19.4
19.4
18.8
18.0
17.0
16.1
19.6
19.5
19.4
19.4
18.9
18.1
17.0
16.1
19.6
20.0
19.4
19.7
19.3
18.3
17.3
16.1
20.6
20.6
20.6
20.3
19.5
18.9
17.5
16.8
20.6
21.0
21.0
20.7
19.5
18.8
17.9
16.9
21.4
21.0
21.0
21.0
19.7
19.2
17.9
17.1
±10 V
±5 V
±2.5 V
±1.25 V
±0.625 V
±0.3125 V
±0.15625 V
±0.078125
V
14.5
14.3
15.0
15.4
16.1
16.2
16.2
16.4
17.0
17.1
16.9
Channel switching error
Table 17. Step response accuracy specifications
Accuracy
Range
3750 S/s 2000 S/s 1000 S/s 500 S/s 100 S/s 60 S/s
50 S/s
25 S/s
10 S/s
5 S/s
2.5 S/s
±20 V
0.0011% 0.0006% 0.0004% 0.0003% 0.0002% 0.0002% 0.0002% 0.0002% 0.0001% 0.0001% 0.0001%
0.0010% 0.0008% 0.0005% 0.0004% 0.0002% 0.0002% 0.0003% 0.0002% 0.0001% 0.0001% 0.0001%
0.0009% 0.0008% 0.0004% 0.0004% 0.0003% 0.0002% 0.0002% 0.0002% 0.0001% 0.0001% 0.0001%
0.0010% 0.0007% 0.0008% 0.0004% 0.0003% 0.0002% 0.0002% 0.0002% 0.0002% 0.0001% 0.0001%
0.0013% 0.0009% 0.0008% 0.0007% 0.0004% 0.0004% 0.0003% 0.0003% 0.0003% 0.0003% 0.0003%
0.0022% 0.0016% 0.0011% 0.0011% 0.0007% 0.0007% 0.0005% 0.0005% 0.0004% 0.0005% 0.0003%
0.0031% 0.0031% 0.0020% 0.0017% 0.0015% 0.0012% 0.0010% 0.0010% 0.0012% 0.0009% 0.0009%
0.0056% 0.0062% 0.0048% 0.0037% 0.0032% 0.0025% 0.0024% 0.0021% 0.0019% 0.0022% 0.0016%
0.0114% 0.0123% 0.0076% 0.0070% 0.0041% 0.0051% 0.0046% 0.0036% 0.0032% 0.0030% 0.0034%
±10 V
±5 V
±2.5 V
±1.25 V
±0.625 V
±0.3125 V
±0.15625 V
±0.078125 V
Channel switching error is defined as the accuracy that can be expected after one conversion when switching
from a channel with a DC input at one extreme of full scale to another channel with a DC input at the other
extreme of full scale, expressed in terms of percentage of full scale value.
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Throughput rate
The single channel throughput rate is calculated using this formula:
Maximum throughput
Table 18. Single channel throughput rate specifications
A/D data rate Maximum throughput (Hz)
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s
1102.94
877.19
609.76
378.79
93.98
57.78
48.45
24.61
9.94
50 S/s
25 S/s
10 S/s
5 S/s
4.98
2.5 S/s
2.50
The multiple-channel throughput rate is calculated using this formula:
Maximum throughput where n is the number of channels
Table 19. Multiple-channel throughput rate specifications (Hz)
3750 S/s 2000 S/s 1000 S/s 500 S/s 100 S/s 60 S/s 50 S/s 25 S/s 10 S/s 5 S/s 2.5 S/s
Number
of input
channels
1
2
1102.94
551.47
367.65
275.74
220.59
183.82
157.56
137.87
122.55
110.29
100.27
91.91
877.19
438.60
292.40
219.30
175.44
146.20
125.31
109.65
97.47
609.76
304.88
203.25
152.44
121.95
101.63
87.11
76.22
67.75
60.98
55.43
50.81
46.90
43.55
40.65
38.11
378.79
189.39
126.26
94.70
75.76
63.13
54.11
47.35
42.09
37.88
34.44
31.57
29.14
27.06
25.25
23.67
93.98
46.99
31.33
23.50
18.80
15.66
13.43
11.75
10.44
9.40
57.78
28.89
19.26
14.45
11.56
9.63
8.25
7.22
6.42
5.78
5.25
4.82
4.44
4.13
3.85
3.61
48.45
24.22
16.15
12.11
9.69
8.07
6.92
6.06
5.38
4.84
4.40
4.04
3.73
3.46
3.23
3.03
24.61
12.30
8.20
6.15
4.92
4.10
3.52
3.08
2.73
2.46
2.24
2.05
1.89
1.76
1.64
1.54
9.94
4.97
3.31
2.48
1.99
1.66
1.42
1.24
1.10
0.99
0.90
0.83
0.76
0.71
0.66
0.62
4.98
2.49
1.66
1.25
1.00
0.83
0.71
0.62
0.55
0.50
0.45
0.42
0.38
0.36
0.33
0.31
2.50
1.25
0.83
0.62
0.50
0.42
0.36
0.31
0.28
0.25
0.23
0.21
0.19
0.18
0.17
0.16
3
4
5
6
7
8
9
10
11
12
13
14
15
16
87.72
79.74
8.54
73.10
7.83
84.84
67.48
7.23
78.78
62.66
6.71
73.53
58.48
6.27
68.93
54.82
5.87
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Analog voltage output
Unused VDACx output channels should be left disconnected.
The OMB-DAQ-2416-4AO output voltage level defaults to 0 V whenever the host PC is reset, shut down or
suspended, or if a reset command is issued to the device.
The duration of the output transient depends highly on the enumeration process of the host PC. Typically, the
output of the OMB-DAQ-2416-4AO is stable after two seconds.
Table 20. Analog voltage output specifications
Parameter
Conditions
Specifications
Digital-to-analog
converter
DAC8555
Number of channels
Resolution
4
16 bits
Output ranges
Calibrated
±10 V
Uncalibrated
±10.05 V, software configurable
Output transient
Host PC is reset, powered on, suspended or a
reset command is issued to device (Note 6)
Duration: 2 s
Amplitude: 2 V p-p
Initial power on
Duration: 50 ms
Amplitude: 5 V peak
Differential
non-linearity
±0.25 LSB typical
±1 LSB maximum
Output current
VDACx pins
±3.5 mA maximum
Unlimited duration
Output short-circuit
protection
VDACx connected to AGND
Output coupling
DC
VDACx readback
Each VDACx output can be independently
measured by the onboard A/D converter.
Software selectable
Power on and reset
state
DACs cleared to zero-scale: 0 V, ±50 mV
Output noise
Settling time
Slew rate
30 µVrms
To rated accuracy, 10 V step
45 µs
1.0 V/µs
Throughput
Single-channel
Multi-channel
1000 S/s maximum, system-dependent
1000 S/s / #ch maximum, system-dependent
Table 21. Calibrated absolute accuracy specifications
Range
Accuracy (±LSB)
16.0
±10 V
Table 22. Calibrated absolute accuracy components specifications
Range
% of reading
Offset (±mV)
Temp drift (%/°C)
Absolute accuracy at FS (±mV)
±10 V
±0.0183
1.831
0.00055
3.661
Table 23. Relative accuracy specifications
Range
Relative accuracy (±LSB)
±10 V
4.0 typical
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Analog input/output calibration
Table 24. Analog input/output calibration specifications
Parameter
Specifications
Recommended warm-up time
Calibration
45 minutes minimum
Firmware calibration
Calibration interval
Calibration reference
1 year
+10.000 V, ±5 mV maximum. Actual measured values stored in EEPROM
Tempco: 5 ppm/°C maximum
Long term stability: 30 ppm/1000 hours
Digital input/output
Table 25. Digital input specifications
Number of I/O
Configuration
8 channels
Each DIO bit can be independently read from (DIN) or written to (DOUT).
The DIN bits can be read at any time whether the DOUT is active or tri-stated.
0 to +15 V
Input voltage range
Input type
CMOS (Schmitt trigger)
Input characteristics
Maximum input voltage range
47 kΩ pull-up/pull-down resistor, 28 kΩ series resistor
0 to +20 V maximum (power on/off, relative to DGND pins 93 and 94)
Pull-up/pull-down
configuration
All pins pulled up to +5 V via individual 47 kΩ resistors (the JP1 shorting block
default position is pins 1 and 2).
Pull down capability is available by placing the JP1 shorting block across pins 2 and 3.
Transfer rate (software paced)
Input high voltage
500 port reads or single bit reads per second typical.
1.3 V minimum, 2.2 V maximum
Input low voltage
1.5 V maximum, 0.6 V minimum
Schmitt trigger hysteresis
0.4 V minimum, 1.2 V maximum
Note 2: DGND pins (pins 93, 94) are recommended for use with digital input and digital output pins. The
DGND and GND pins are common and are isolated from earth ground.
Table 26. Digital output specifications
Number of I/O
Configuration
8 channels
Each DIO bit can be independently read from (DIN) or written to (DOUT).
The DIN bits may be read at any time whether the DOUT is active or tri-stated
Output characteristics
Pull-up configuration
47 kΩ pull-up, open drain (DMOS transistor)
All pins pulled up to +5 V via individual 47 kΩ resistors (the JP1 shorting block
default position is pins 1 and 2).
Transfer rate (software paced)
Output voltage range
Digital output – 500 port writes or single-bit writes per second typical.
0 to +5 V (no external pull up resistor, internal 47 kΩ pull-up resistors connected to
+5 V by default)
0 to +15 V maximum (Note 5)
Drain to source breakdown
voltage
+50 V minimum
Off state leakage current
(Note 6)
0.1 µA
. 150 mA maximum (continuous) per output pin
. 150 mA maximum (continuous) for all eight channels
Sink current capability
DMOS transistor on-resistance
(drain to source)
4 Ω
Note 3: Each DMOS transistor’s source pin is internally connected to GND.
Note 4: DGND pins (pins 93, 94) are recommended for use with digital input and digital output pins. The
DGND and GND pins are common and are isolated from earth ground.
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Note 5: The external pull-up is connected to the digital output bit through an external pull-up resistor. Adding
an external pull-up resistor connects it in parallel with the internal 47 kΩ pull-up resistor of that
particular digital input/output bit. Careful consideration should be made when considering the external
pull-up resistor value and the resultant pull-up voltage produced at the load.
Note 6: Does not include the additional leakage current contribution that may occur when using an external
pull-up resistor.
Counter
Table 27. CTR specifications
Conditions
Parameter
Specification
Pin name
CTR0, CTR1
Number of channels
Resolution
2 channels
32-bits
Counter type
Input type
Event counter
Schmitt trigger, rising edge triggered
Input source
CTR0 (pin 43)
CTR1 (pin 45)
Counter read/writes rates
(software paced)
Counter read
System dependent, 500 reads per second.
System dependent, 500 writes per second.
Counter write
Input characteristics
Each CTRx input pin
562 KΩ pull-up resistor to +5 V, 10 kΩ series
resistor
Input voltage range
±15 V maximum
Maximum input voltage range
CTR0,CTR1 relative to GND and
DGND (pins
±20 V maximum (power on/off)
18,36,39,42,44,46,66,81,84,93,94)
Input high voltage
Input low voltage
1.3 V minimum, 2.2 V maximum
1.5 V maximum, 0.6 V minimum
0.4 V minimum, 1.2 V maximum
1 MHz
Schmitt trigger hysteresis
Input bandwidth (-3 dB)
Input capacitance
Input leakage current
Input frequency
25 pf
±120 nA
1 MHz, maximum
500 ns, minimum
High pulse width
Low pulse width
500 ns, minimum
Note 7: The DGND and GND pins (pins 18,36,39,42,44,46,66,81,84,93,94) are common and are isolated from
earth ground.
Memory
Table 28. Memory specifications
EEPROM
4096 bytes isolated micro reserved for sensor configuration
256 bytes USB micro for external application use
Microcontroller
Table 29. Microcontroller specifications
Type
One high-performance 8-bit RISC microcontroller with USB interface (non-isolated)
One high-performance 16-bit RISC microcontroller for measurements (isolated)
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Power
Table 30. Power specifications
Conditions
Parameter
Specification
Supply current (Note 8)
External power input (Note 9)
External power supply
Quiescent current
340 mA
+5 V, ±5%
OMB-DAQ-2416-ADAP (included)
4.5 V > Vext or Vext > 5.5 V
+5 VDC, 10 W, 5% regulation
PWR LED = Off; (power fault)
PWR LED = On
Voltage supervisor limits
4.5 V < Vext < 5.5 V
+5 V user output voltage range
User +5V user output current
Available at terminal block pin 35
Available at terminal block pin 35
4.9 V minimum to 5.1 V maximum
10 mA maximum
Isolation
Measurement system to PC
500 VDC minimum
Table 31. AC power requirements
Parameter
Conditions
Specification
Output voltage
+5 V, ±5%
10 watts
Output wattage
Power jack configuration
Power jack barrel diameter
Power jack pin diameter
Power jack polarity
Two conductor
6.3 mm
2.0 mm
Center positive
Note 8: This is the total quiescent current requirement for the OMB-DAQ-2416-4AO which includes up to
10 mA for the status LED. This does not include any potential loading of the digital I/O bits, +5V user
terminal or the VDACx outputs.
Note 9: This specification applies to the actual voltage level at the input to the external power connector of the
OMB-DAQ-2416-4AO.
USB specifications
Table 32. USB specifications
USB device type
Device compatibility
USB cable type
USB 2.0 (full-speed)
USB 1.1, USB 2.0
A-B cable, UL type AWM 2527 or equivalent. (minimum 24 AWG VBUS/GND,
minimum 28 AWG D+/D–)
USB cable length
5 meters maximum
Environmental
The environmental specifications listed in Table 33 apply only to the OMB-DAQ-2416-4AO and not to the
external power supply.
Table 33. Environmental specifications
Operating temperature range
Storage temperature range
Humidity
0 to 50° C maximum
-40 to 85 ° C maximum
0 to 90% non-condensing maximum
Mechanical
Table 34. Mechanical specifications
Dimensions
245 mm (L) x 146 mm (W) x 50 mm (H)
5 meters maximum
User connection length
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Screw terminal connector type and pin-out
Table 35. Screw terminal connector specifications
Connector type
Detachable screw terminal
16 AWG to 30 AWG
Wire gauge range
Screw terminal pin out
For additional channel configurations when using the optional AI-EXP expansion device, refer to the "Optional
OMB-AI-EXP32 expansion module" section on page 47.
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Table 36. 16-channel differential mode pin out
Do not connect to terminal block pins labeled "NC."
Pin
1
Signal name
NC
Pin description
No connect
Pin
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
Signal name
NC
Pin description
No connect
2
CH0H
CH0L
NC
Channel 0 HI
Channel 0 LO
No connect
CH15L
CH15H
IC14
Channel 15 LO
Channel 15 HI
No connect
3
4
5
IC0
No connect
4WC14
CH14L
CH14H
IC13
No connect
6
CH1H
CH1L
4WC1
IC1
Channel 1 HI
Channel 1 LO
No connect
Channel 14 LO
Channel 14 HI
No connect
7
8
9
No connect
4WC13
CH13L
CH13H
IC12
No connect
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
CH2H
CH2L
4WC2
IC2
Channel 2 HI
Channel 2 LO
No connect
Channel 13 LO
Channel 13 HI
No connect
No connect
4WC12
CH12L
CH12H
IC11
No connect
CH3H
CH3L
4WC3
IC3
Channel 3 HI
Channel 3 LO
No connect
Channel 12 LO
Channel 12 HI
No connect
No connect
4WC11
GND
No connect
GND
CH4H
CH4L
4WC4
IC4
Analog ground
Channel 4 HI
Channel 4 LO
No connect
Analog ground
Channel 11 LO
Channel 11 HI
No connect
CH11L
CH11H
IC10
No connect
4WC10
CH10L
CH10H
IC9
No connect
CH5H
CH5L
4WC5
IC5
Channel 5 HI
Channel 5 LO
No connect
Channel 10 LO
Channel 10 HI
No connect
No connect
4WC9
CH9L
CH9H
IC8
No connect
CH6H
CH6L
4WC6
IC6
Channel 6 HI
Channel 6 LO
No connect
Channel 9 LO
Channel 9 HI
No connect
No connect
4WC8
CH8L
CH8H
GND
No connect
CH7H
CH7L
4WC7
IC7
Channel 7 HI
Channel 7 LO
No connect
Channel 8 LO
Channel 8 HI
Analog ground
No connect
No connect
NC
+5V
+5V output
NC
No connect
GND
VDAC0
VDAC1
GND
VDAC2
VDAC3
GND
CTR0
GND
CTR1
GND
NC
Analog ground
Analog output Ch0
Analog output Ch1
Analog ground
Analog output Ch2
Analog output Ch3
Analog ground
Counter input Ch0
Analog ground
Counter input Ch1
Analog ground
No connect
GND
Analog ground
DIO7
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital I/O ground
Digital I/O ground
No connect
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
DIO0
DGND
DGND
NC
NC
No connect
NC
No connect
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Table 37. 32-channel single-ended mode pin out
Do not connect to terminal block pins labeled "NC."
Pin
1
Signal name
NC
Pin description
No connect
Pin
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
Signal name
NC
Pin description
No connect
Channel 31
Channel 15
No connect
No connect
Channel 30
Channel 14
No connect
No connect
Channel 29
Channel 13
No connect
No connect
Channel 28
Channel 12
No connect
No connect
Analog ground
Channel 27
Channel 11
No connect
No connect
Channel 26
Channel 10
No connect
No connect
Channel 25
Channel 9
2
CH0H
CH0L
NC
Channel 0
CH15L
CH15H
IC14
3
Channel 16
No connect
4
5
IC0
No connect
4WC14
CH14L
CH14H
IC13
6
CH1H
CH1L
4WC1
IC1
Channel 1
7
Channel 17
No connect
8
9
No connect
4WC13
CH13L
CH13H
IC12
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
CH2H
CH2L
4WC2
IC2
Channel 2
Channel 18
No connect
No connect
4WC12
CH12L
CH12H
IC11
CH3H
CH3L
4WC3
IC3
Channel 3
Channel 19
No connect
No connect
4WC11
GND
GND
CH4H
CH4L
4WC4
IC4
Analog ground
Channel 4
CH11L
CH11H
IC10
Channel 20
No connect
No connect
4WC10
CH10L
CH10H
IC9
CH5H
CH5L
4WC5
IC5
Channel 5
Channel 21
No connect
No connect
4WC9
CH9L
CH9H
IC8
CH6H
CH6L
4WC6
IC6
Channel 6
Channel 22
No connect
No connect
No connect
Channel 24
Channel 8
No connect
4WC8
CH8L
CH8H
GND
CH7H
CH7L
4WC7
IC7
Channel 7
Channel 23
No connect
Analog ground
No connect
No connect
Analog ground
No connect
NC
+5V
+5V output
NC
GND
VDAC0
VDAC1
GND
VDAC2
VDAC3
GND
CTR0
GND
CTR1
GND
NC
Analog ground
Analog output Ch0
Analog output Ch1
Analog ground
Analog output Ch2
Analog output Ch3
Analog ground
Counter input Ch0
Analog ground
Counter input Ch1
Analog ground
No connect
GND
DIO7
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital I/O ground
Digital I/O ground
No connect
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
DIO0
DGND
DGND
NC
NC
No connect
NC
No connect
46
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OMB-DAQ-2416-4AO User's Guide
Specifications
Optional OMB-AI-EXP32 expansion module
Use the OMB-AI-EXP32 (sold separately) for applications that need additional analog/thermocouple input and
digital I/O channels. See the Omega Engineering web site for product details.
The OMB-AI-EXP32 expansion port is intended to interface with a OMB-DAQ-2416 series product. Do not try
to use any of the expansion port pins for any other purpose.
Table 38. OMB-AI-EXP32 37-pin connector pin out
Do not connect to terminal block pins labeled "NC."
Pin
1
Signal name
GND
Pin description
Analog ground
No connect
2
NC
3
GND
Analog ground
No connect
4
NC
5
GND
Analog ground
+12 V power
6
VCC
7
NC
No connect
8
NC
No connect
9
IM_A2
IM_A1
IM_A0
IMEN10
IMEN9
IMEN8
IMEN7
DIO_LOAD2
DIO_LOAD1
NC
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
No connect
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
NC
No connect
+3.3V_ISO
GND
+3.3 V power
Analog ground
+5 V analog power
+20.5 V power
Analog ground
-20.5 V power
+5 VA
+20.5V
GND
-20.5V
VDD_ISO
EXTDIO_INT
CM_A3
SM_A1
SM_AO
CM_A2
SCL
+5 V digital power
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
Serial I/O control signal
Serial I/O control signal
Serial I/O control signal
Serial I/O control signal
No connect
SDA
MOSI
SCK
NC
NC
No connect
The multiple-channel throughput rate calculation is based on the following formula:
Maximum throughput =
, where n is the number of channels
47
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OMB-DAQ-2416-4AO User's Guide
Specifications
Table 39. Multiple-channel throughput rate specifications (Hz),
OMB-DAQ-2416-4AO and optional OMB-AI-EXP32 expansion module
3750 S/s 2000 S/s 1000 S/s 500 S/s 100 S/s 60 S/s 50 S/s 25 S/s 10 S/s 5 S/s 2.5 S/s
Number
of input
channels
1
1102.94
551.47
367.65
275.74
220.59
183.82
157.56
137.87
122.55
110.29
100.27
91.91
877.19
438.60
292.40
219.30
175.44
146.20
125.31
109.65
97.47
609.76
304.88
203.25
152.44
121.95
101.63
87.11
76.22
67.75
60.98
55.43
50.81
46.90
43.55
40.65
38.11
378.79
189.39
126.26
94.70
75.76
63.13
54.11
47.35
42.09
37.88
34.44
31.57
29.14
27.06
25.25
23.67
93.98
46.99
31.33
23.50
18.80
15.66
13.43
11.75
10.44
9.40
57.78
28.89
19.26
14.45
11.56
9.63
8.25
7.22
6.42
5.78
5.25
4.82
4.44
4.13
3.85
3.61
48.45
24.22
16.15
12.11
9.69
8.07
6.92
6.06
5.38
4.84
4.40
4.04
3.73
3.46
3.23
3.03
24.61
12.30
8.20
6.15
4.92
4.10
3.52
3.08
2.73
2.46
2.24
2.05
1.89
1.76
1.64
1.54
9.94
4.97
3.31
2.48
1.99
1.66
1.42
1.24
1.10
0.99
0.90
0.83
0.76
0.71
0.66
0.62
4.98
2.49
1.66
1.25
1.00
0.83
0.71
0.62
0.55
0.50
0.45
0.42
0.38
0.36
0.33
0.31
2.50
1.25
0.83
0.62
0.50
0.42
0.36
0.31
0.28
0.25
0.23
0.21
0.19
0.18
0.17
0.16
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
87.72
79.74
8.54
73.10
7.83
84.84
67.48
7.23
78.78
62.66
6.71
73.53
58.48
6.27
68.93
54.82
5.87
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
64.88
61.27
58.05
55.15
52.52
50.13
47.95
45.96
44.12
42.42
40.85
39.39
38.03
36.76
35.58
34.47
51.60
48.73
46.17
43.86
41.77
39.87
38.14
36.55
35.09
33.74
32.49
31.33
30.25
29.24
28.30
27.41
35.87
33.88
32.09
30.49
29.04
27.72
26.51
25.41
24.39
23.45
22.58
21.78
21.03
20.33
19.67
19.05
22.28
21.04
19.94
18.94
18.04
17.22
16.47
15.78
15.15
14.57
14.03
13.53
13.06
12.63
12.22
11.84
5.53
5.22
4.95
4.70
4.48
4.27
4.09
3.92
3.76
3.61
3.48
3.36
3.24
3.13
3.03
2.94
3.40
3.21
3.04
2.89
2.75
2.63
2.51
2.41
2.31
2.22
2.14
2.06
1.99
1.93
1.86
1.81
2.85
2.69
2.55
2.42
2.31
2.20
2.11
2.02
1.94
1.86
1.79
1.73
1.67
1.61
1.56
1.51
1.45
1.37
1.30
1.23
1.17
1.12
1.07
1.03
0.98
0.95
0.91
0.88
0.85
0.82
0.79
0.77
0.58
0.55
0.52
0.50
0.47
0.45
0.43
0.41
0.40
0.38
0.37
0.35
0.34
0.33
0.32
0.31
0.29
0.28
0.26
0.25
0.24
0.23
0.22
0.21
0.20
0.19
0.18
0.18
0.17
0.17
0.16
0.16
0.15
0.14
0.13
0.12
0.12
0.11
0.11
0.10
0.10
0.10
0.09
0.09
0.09
0.08
0.08
0.08
48
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OMB-DAQ-2416-4AO User's Guide
Specifications
OMB-AI-EXP32 screw terminal pin out
Table 40. 32-channel differential mode pin out
Do not connect to terminal block pins labeled "NC."
Pin
1
Signal name
CH16H
CH16L
CH17H
CH17L
CH18H
CH18L
CH19H
CH19L
CH20H
CH20L
CH21H
CH21L
CH22H
CH22L
CH23H
CH23L
GND
Pin description
Channel 16 HI
Channel 16 LO
Channel 17 HI
Channel 17 LO
Channel 18 HI
Channel 18 LO
Channel 19 HI
Channel 19 LO
Channel 20 HI
Channel 20 LO
Channel 21 HI
Channel 21 LO
Channel 22 HI
Channel 22 LO
Channel 23 HI
Channel 23 LO
Analog ground
Analog ground
+5V output
Pin
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
Signal name
CH31L
CH31H
CH30L
CH30H
CH29L
CH29H
CH28L
CH28H
CH27L
CH27H
CH26L
CH26H
CH25L
CH25H
CH24L
CH24H
GND
Pin description
Channel 31 LO
Channel 31 HI
Channel 30 LO
Channel 30 HI
Channel 29 LO
Channel 29 HI
Channel 28 LO
Channel 28 HI
Channel 27 LO
Channel 27 HI
Channel 26 LO
Channel 26 HI
Channel 25 LO
Channel 25 HI
Channel 24 LO
Channel 24 HI
Analog ground
Analog ground
No connect
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
GND
GND
+5VUSER
NC
NC
No connect
NC
No connect
DIO8
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
Digital ground
No connect
DIO23
DIO22
DIO21
DIO20
DIO19
DIO18
DIO17
DIO16
DGND
DGND
NC
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
DGND
DGND
NC
Digital ground
No connect
NC
No connect
NC
No connect
49
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OMB-DAQ-2416-4AO User's Guide
Specifications
Table 41. 32-channel single-ended mode pin out
Do not connect to terminal block pins labeled "NC."
Pin
1
Signal name
CH16H
CH16L
CH17H
CH17L
CH18H
CH18L
CH19H
CH19L
CH20H
CH20L
CH21H
CH21L
CH22H
CH22L
CH23H
CH23L
GND
Pin description
Channel 16
Pin
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
69
70
71
72
73
74
75
76
61
62
63
64
Signal name
CH31L
CH31H
CH30L
CH30H
CH29L
CH29H
CH28L
CH28H
CH27L
CH27H
CH26L
CH26H
CH25L
CH25H
CH24L
CH24H
GND
Pin description
Channel 63
Channel 31
Channel 62
Channel 30
Channel 61
Channel 29
Channel 60
Channel 28
Channel 59
Channel 27
Channel 58
Channel 26
Channel 57
Channel 25
Channel 56
Channel 24
Analog ground
Analog ground
No connect
No connect
2
Channel 48
3
Channel 17
4
Channel 49
5
Channel 18
6
Channel 50
7
Channel 19
8
Channel 51
9
Channel 20
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Channel 52
Channel 21
Channel 53
Channel 22
Channel 54
Channel 23
Channel 55
Analog ground
Analog ground
+5V output
GND
GND
+5VUSER
NC
NC
No connect
NC
DIO8
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
Digital ground
No connect
DIO23
DIO22
DIO21
DIO20
DIO19
DIO18
DIO17
DIO16
DGND
DGND
NC
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
DGND
DGND
NC
Digital ground
No connect
NC
No connect
NC
No connect
50
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OMB-DAQ-2416-4AO User's Guide
Specifications
OMB-DAQ-2416-4AO screw terminal pin out (with OMB-AI-EXP32 attached)
Table 42. OMB-DAQ-2416-4AO single-ended mode pin out with OMB-AI-EXP32 connected
Do not connect to terminal block pins labeled "NC."
Pin
1
Signal name
NC
Pin description
No connect
Pin
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
Signal name
NC
Pin description
No connect
2
CH0H
CH0L
NC
Channel 0
CH15L
CH15H
IC14
Channel 47
3
Channel 32
No connect
Channel 15
4
No connect
5
IC0
No connect
4WC14
CH14L
CH14H
IC13
No connect
6
CH1H
CH1L
4WC1
IC1
Channel 1
Channel 46
7
Channel 33
No connect
Channel 14
8
No connect
9
No connect
4WC13
CH13L
CH13H
IC12
No connect
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
CH2H
CH2L
4WC2
IC2
Channel 2
Channel 45
Channel 34
No connect
Channel 13
No connect
No connect
4WC12
CH12L
CH12H
IC11
No connect
CH3H
CH3L
4WC3
IC3
Channel 3
Channel 44
Channel 35
No connect
Channel 12
No connect
No connect
4WC11
GND
No connect
GND
CH4H
CH4L
4WC4
IC4
Analog ground
Channel 4
Analog ground
Channel 43
CH11L
CH11H
IC10
Channel 36
No connect
Channel 11
No connect
No connect
4WC10
CH10L
CH10H
IC9
No connect
CH5H
CH5L
4WC5
IC5
Channel 5
Channel 42
Channel 37
No connect
Channel 10
No connect
No connect
4WC9
CH9L
CH9H
IC8
No connect
CH6H
CH6L
4WC6
IC6
Channel 6
Channel 41
Channel 38
No connect
Channel 9
No connect
No connect
4WC8
CH8L
CH8H
GND
No connect
CH7H
CH7L
4WC7
IC7
Channel 7
Channel 40
Channel 39
No connect
Channel 8
Analog ground
No connect
No connect
NC
+5V
+5V output
NC
No connect
GND
VDAC0
VDAC1
GND
VDAC2
VDAC3
GND
CTR0
GND
CTR1
GND
NC
Analog ground
Analog output Ch0
Analog output Ch1
Analog ground
Analog output Ch2
Analog output Ch3
Analog ground
Counter input Ch0
Analog ground
Counter input Ch1
Analog ground
No connect
GND
Analog ground
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital I/O ground
Digital I/O ground
No connect
DIO7
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
DIO0
DGND
DGND
NC
NC
No connect
NC
No connect
51
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