Keysight Technologies DAQ970A Installation guide

TECHNICAL
OVERVIEW
Keysight DAQ970A
Data Acquisition/System
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At a fraction of the cost of other
standalone data acquisition systems
– 3-slot mainframe with built-in 6½ digit DMM and
– 8 switch and control plug-in modules
– Measures and converts 12 different input signals:
temperature with thermocouples, RTDs and thermistors; dc/
ac volts; 2- and 4-wire resistance; frequency and period; dc/
ac current and capacitance
– LAN and USB for easy connectivity to your PC:
– Graphical Web interface for point and click monitor and
control
– USB flash drive support to copy/log data in standalone
applications
Features
Price and performance beyond compare
Go ahead and compare the Keysight Technologies, Inc. DAQ970A
Data Acquisition System with other data acquisition systems
currently available. You’ll find it hard to come up with a system
that offers the powerful measurement performance, flexibility,
connectivity options and ease of use of the DAQ970A—even in
systems costing three to five times as much.
What can you expect from a data acquisition
system that’s this affordable? Measurements you
can trust
We took the measurement engine from our best-selling benchtop
DMM and embedded it inside a 3-slot mainframe. You get the
benefit of proven Keysight measurement performance, universal
inputs with built-in signal conditioning, and modular flexibility, all
in a low-cost, compact data acquisition package. The DAQ970A
features 6½ digits (22 bits) of resolution, 0.004% basic dcV
accuracy, and ultra-low reading noise. Combine that with scan
rates of up to 450 channels/sec, and you’ve got the speed and
accuracy you need to get the job done right the first time.
Built-in signal conditioning to get your job done
Whether you need to measure temperature, ac/dc volts,
resistance, frequency, or current, the DAQ970A can handle it.
The internal autoranging DMM directly measures 12 different
functions, eliminating the need for expensive external signal
conditioning. And our unique design allows complete per channel
configurability for maximum flexibility and quick, easy set up. It’s
like having an independent, high-performance DMM behind each
channel.
Standard connectivity to the PC
The DAQ970A has built-in Gigabit LAN and USB 2.0. With the
standard LAN connections you also get the added benefit of a
graphical Web interface for easy configuration of measurements
and monitoring of results using a standard Web browser.
Convenient data storage with USB flash drive
The DAQ970A also features a built-in USB memory port so that
you can use a USB flash drive to collect data without being
connected to a PC. Data can be logged directly to the USB
flash drive, extending your instrument’s memory, or copied from
internal memory for transfer to a computer in another location.
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Virtual front panel control via Web interface
The built-in graphical Web interface provides easy access and
control of the instrument using a Web browser such as Chrome
and Internet Explorer. Using this interface you can configure
measurements, define and execute scan lists, or monitor mea-
surement results from anywhere on the network. Simply enter the
instrument host name or IP address into the browser URL and
gain access to the instrument’s front panel capabilities.
– Specify per channel measurement configuration
– Define and execute switch scans
– Monitor measurement readings
– View and save data
– View error queue
– View instrument information like module configuration, relay
counts, firmware revisions, and more
Additionally, since the Web interface is built into the instrument,
you can access it on any operating system that supports a Web
browser without having to install any special software.
Password protection and LAN lock out are also provided
to limit access. The graphical Web interface makes it easy to
configure measurements, set up and execute scans or trouble-
shoot your designs from anywhere on the network.
BenchVue DAQ software saves you time and
money
Now you don’t have to spend your valuable time writing
or configuring software. Keysight BenchVue DAQ software gives
you a familiar Microsoft Windows interface for test configuration
and real-time data display and analysis.
Unequaled ease of use
From the simplified configuration to BenchVue DAQ, we put in
extra time and energy so you don’t have to. Simple things like
on-module screw-terminal connectors, built-in thermocouple
reference junctions, well-organized user documentation full of
examples and hints, all add up to increased productivity, whether
you use the instrument every day or only now and then.
Custom configurations that grow with you
Three module slots and seven switch/control modules allow you
to customize the DAQ970A to meet your unique requirements.
Buy only what you need—and add more modules later as your
application grows.
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Front Panel at a Glance
Rear Panel at a Glance
Label Description
1 USB port
2 On/Standby switch with LED indicator
3Display
4Softkeys
5 Measurement operation menu (to control the initiation of the measurements)
6 Measurement configuration menu (to set parameters for measurements)
7Knob
8 Cursor navigation keypad
Label Description
1 Slot identifier (100, 200, 300)
2 External trigger input, alarm outputs, channel advance input, and channel close output
3AC mains input
4 Instrument cable lock
5 LAN interface connector
6 Chassis ground screw
7 USB interface connector
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The Keysight DAQ970A Offers
Unequaled Versatility for Your Data
Acquisition Applications
In the past, you had to make a choice. On the one hand, you could
choose the simple operation and low cost of a data logger. On
the other hand, you had the flexibility and higher performance of
a modular data acquisition system. The Keysight DAQ970A Data
Acquisition/System gives you the best of both worlds: a simple
user interface with low per-channel cost, modular flexibility,
standard connectivity and impressive measurement performance.
Whether you’re an R&D engineer working on characterizing your
latest design, or a manufacturing engineer building a test system
or troubleshooting a process, the DAQ970A Data Acquisition/
System offers the best combination of price and measurement
performance.
It’s a data logger
Configured with a 20-channel relay multiplexer, the DAQ970A
becomes a powerful, low-cost data logger for simple charac-
terization applications. What’s more, the DAQ970A with its LAN
and USB interfaces is ideal for easy set up and control for data
logging applications in remote locations.
It’s a data acquisition front end
The DAQ970A is an automated test system with excellent
measurement performance—it’s got the accuracy, resolution, and
speed you need. See page 10 for application information.
An easy-to-use data logger for monitoring and
characterization applications
Data loggers are used to monitor multiple signals (temperature,
voltage, etc.) over extended periods of time to identify irregu-
larities. Example applications include environmental chamber
monitoring, component inspection, benchtop testing, process
troubleshooting, and temperature profiling.
The Keysight DAQ970A is easy to use for a multitude of data
logging and monitoring applications, either stand-alone or
with a computer. Its flexible, modular design makes it scalable
from 20 to 120 channels, and lets you add actuator, digital I/O,
and analog output channels for simple control. Its small size,
ruggedized features and USB memory port on the DAQ970A
make it perfect for portable applications. Use LAN and USB
interfaces for simple connection to the PC and support of remote
applications. The DAQ970A can be set up at remote locations and
accessed through the Web interface on a network connection or
through the USB port by copying instrument configurations and
measurement data results to a USB flash drive.
Better measurements with fewer hassles
Tired of putting up with the mediocre measurement performance
you get with most data loggers or plug-in data acquisition
boards? The DAQ970A offers 6½ digits of resolution and 0.004%
basic 1-year dcV accuracy.
Simplify your data gathering with
Keysight BenchVue DAQ software
Do you want PC-based data logging capability, but don’t
want to spend hours programming? BenchVue DAQ
software is the answer. This Windows-based application is
designed to make it a snap to use your PC for gathering and
analyzing measurements. Use it to set up your test, acquire
and archive measurement data, and perform real-time
display and analysis of the incoming measurements.
A familiar spreadsheet environment makes it easy to
configure and control your tests. And a rich set of colorful
graphics provides many options for analyzing and display-
ing your data—all with point-and-click ease. Set up multiple
graphics using strip charts, histograms, bar and scatter
charts, individual channel results, and more. And of course
you can use BenchVue DAQ to easily move data to other
applications for further analysis, or for inclusion in your
presentations and reports.
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And the DAQ970A measures and converts 12 different input
signals:
– Temperature with thermocouples, RTDs, and thermistors
– dc and ac volts
– 2- and 4-wire resistance
– Frequency and period
– Capacitance and diode
– Strain
What’s more, each channel is independently configurable. This
means you can configure channel 1—for dcV, channel 2 for a
K-type thermocouple, and channels 3 and 13 for a 4-wire RTD
measurement—all on the same module, all in a single scan. For
custom linear conversions, use the Mx+B scaling function on any
channel. You can even display a custom engineering label like
RPM or PSI to identify your measurement units.
Versatile alarms
Alarms are available on a per-channel basis as well. Enter a high
limit, a low limit, or both. The DAQ970A compares each reading
to its limits and flags any out-of-range measurements. You can
assign one of four TTL alarm outputs to any input channel to
trigger external alarm lights, sirens, or send a TTL pulse to your
control system, all without a PC connected.
Scanning made simple
The DAQ970A automatically builds a scan list that includes all
configured inputs (even digital inputs from the Keysight multi-
function module) in ascending order by channel number. You can
pace scans by setting the DAQ970A internal timer for automatic
scanning at a specific interval, by manually pressing a front-panel
button, or by sending a software command or external TTL
trigger pulse.
Monitor any input
A special display mode monitors a selected input channel,
continuously updating the display with new readings—even
during a scan. Or, when using the DAQ970A with built-in LAN, the
channels can be monitored over the network using the graphical
Web interface. It’s great for keeping an eye on a key input, or for
troubleshooting your system before a test.
Non-volatile memory and USB flash drive adds
convenience, portability
All readings are automatically time-stamped and stored in a
nonvolatile 100 k reading memory—enough memory to hold
more than a week’s worth of data (20 channels scanned every
five minutes). The nonvolatile memory holds your data even after
power is removed, so you can use the DAQ970A to collect data at
a remote location for later uploading to a PC. Or if you need even
more memory, the DAQ970A USB port can be used to log data
directly to a USB flash drive or to copy the data from the reading
memory without being connected to a computer.
Data logging feature checklist
– From 1 to 120 channels of analog input
– Measurements include dc volts, ac volts, thermo-
couple, thermistor and RTD temperature measure-
ments, 2- and 4-wire Ohms, dc current, ac current,
frequency, and period and capacitance
– 6½ digits (22 bits) of resolution
– 100 k reading nonvolatile memory including
time-stamp
– Scaling and alarms available on each channel
– Full-featured front panel for stand-alone configuration,
troubleshooting, and data viewing
– BenchVue DAQ software for configura-tion and data
analysis
– Nonvolatile storage for five complete instrument states
– Built-in LAN or USB interfaces to support remote data
logging applications
A powerful, flexible data acquisition system for
automated test
The DAQ970A gives you the resolution, accuracy, repeatability,
and speed you’ve come to expect from a Keysight data acquisition
system. It provides the measurement muscle you need, along with
signal routing and control capability, in a flexible, modular format
that can grow and change to match your varied applications.
Powerful measurements
The internal 6½ digit DMM brings the power and performance
of a world-class stand-alone DMM to the DAQ970A, but at a
fraction of the cost and in a fraction of the space. It’s as accurate
as the best bench DMM available: 0.004% basic 1-year dcV
accuracy, 0.06% basic 1-year acV accuracy, and 0.01% basic
1-year resistance accuracy. Our patented A-D technology offers
incredible linearity (2 ppm of reading +1 ppm of range) along
with 22 bits of real resolution. And since it is an integrating A/D,
it provides excellent noise rejection as well—a nice change from
noisy and sampling A/Ds. No more averaging lots of samples just
to see the real data you wanted. And if you need high scan rates,
the DAQ970A is capable of delivering fully converted measure-
ments at speeds up to 450 ch/s.
The input section of the DMM is optically isolated and shielded
from the DAQ970A earth-referenced circuitry and computer
interface, offering up to 300 V of input isolation. This is important
for reducing ground loop and common mode voltage errors
associated with long wiring runs and floating measurement
sources.
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Get better measurements with built-in
signal conditioning
The Keysight DAQ970A architecture offers advantages over
other data acquisition solutions which rely on external or
plug-in signal conditioning modules for handling functions
other than dcV:
– Minimizes external wiring and the resultant potential for
noise and errors to enter your system
– Reduces hidden costs and overall system cost by
avoiding unnecessary cables, breakout boxes and signal
conditioning elements
– Simplifies your configuration—for faster, easier setup—
with fewer connections and components
– Takes the guesswork out of error analysis.
– Measurement accuracies are specified to include all
system-related errors
– Improves reliability, with fewer interconnects and fewer
parts that can fail
Flexible functionality
The DMM is installed inside the chassis rather than in one of the
slots, leaving all three mainframe slots free for switch and control
modules. You can choose from eight different modules (see page
13) to get the precise functionality you need now—while giving
you flexibility for future expansion.
The internal DMM gives you the flexibility to measure 12 types of
inputs easily and inexpensively. The built-in signal conditioning
and conversion routines turn raw inputs directly into real informa-
tion. Each measurement channel is independently configurable,
so you can set different measurement functions, scale factors and
alarm limits, even on adjacent channels. Advanced measurement
features such as offset compensation, variable integration time,
and delay are also selectable on a per-channel basis.
Software drivers
Your months of test system software development time need
not go to waste. Software drivers that support (C, C#, Visual
Basic, Visual Studio), LAN and USB on the DAQ970A and SCPI
programming language make integration even easier.
The functionality you need
We put a lot of thought into defining and designing the modules
for the DAQ970A in order to cover a broad spectrum of switching
and signal routing requirements with fewer modules. The result?
Simplified ordering and easier configuration. And while we were
at it, we improved performance and density. The DAQ970A mod-
ules can switch from microvolts to 300 volts, dc to 2 GHz, and
with densities as high as 120 single-ended channels or 96 matrix
crosspoints per frame. Plus, simple control capabilities like analog
outputs, open collector digital outputs, and isolated Form-C
relays for controlling higher-powered devices are available.
Easy scanning
The DAQ970A can easily scan with external instruments. It builds
a scan list that includes all enabled low frequency multiplexer
inputs. Scans are controlled with the external channel advance
input, or with the front panel Step key.
Connect to the company network
With the LAN interface, the instrument is easily connected to
the company network to collect measurement data to a central
database, remotely access the instrument’s set up, or monitor
measurement data from anywhere on the network.
ATE feature checklist
– 3-slot cardcage with 6½ digit (22 bit) internal DMM
0.004% basic 1-year dcV accuracy; 0.06% acV accuracy
– Up to 120 single-ended measurements or 96 matrix
crosspoints in a 3½” high, half-rack instrument
– Eight switch and control modules include low- frequency
and RF multiplexers, matrix and actuation switches,
digital input and output, analog output, and event
recording
– Scan rates up to 450 ch/s
– Graphical Web interface to speed up test development
and monitor tests remotely
– and National Instruments LabView
– Relay maintenance feature for system maintenance
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Keysight DAQ970A modules-at-a-glance selection guide
Model description Type Speed
(ch/sec)
Max
volts
Max
amps
Bandwidth Thermal
offset
Comments Page
DAQM900A
20 ch Multiplexer
2-wire solid-state
(4-wire selectable)
450 120 V 20 mA 10 MHz < 4 μV Built-in cold junction reference 19
DAQM901A
20 ch Multiplexer
+ 2 current channels
2-wire armature
(4-wire selectable)
80 300 V 1 A 10 MHz 0 µV Built-in cold junction reference
2 additional current channels
(22 total)
20
DAQM902A
16 ch Multiplexer
2-wire reed
(4-wire selectable)
250 [1] 300 V 50 mA 10 MHz < 4 µV Built-in cold junction reference 20
DAQM903A
20 ch Actuator/GP Switch
SPDT/form C 120 300 V 1 A 10 MHz < 1 µV 21
DAQM904A 4 x 8 Matrix 2-wire armature 120 300 V 1 A 10 MHz < 1 µV 22
DAQM905A
Dual 4 ch RF Mux 50 Ω
Common low
(unterminated)
60 42 V 0.7 A 2 GHz < 4 µV 1 GHz bandwidth through
BNC-to-SMB adapter cable
22
DAQM907A
Multifunction Module
Two 8-bit digital I/O ports 42 V 400 mA Open drain 23
26-bit event counter 42 V 100 KHz Selectable input threshold
Two 16-bit analog outputs ±12 V 10 mA dc Max 40 mA total output per frame
DAQM908A
40 ch Single-Ended Mux
1-wire armature
(common low)
100 300 V 1A 10 MHz < 1 µV No four-wire measurements 21
[1] Up to 250 ch/sec to internal memory.
See scanning rates for measurement condition and rate on each instrument.
Customize your Keysight DAQ970A with plug-in
modules
A complete selection of plug-in modules gives you high quality
measurement, switching, and control capabilities to choose
from. Modules include both low-frequency and RF multiplexers,
a matrix switch, a general-purpose switch, and a multifunction
module that includes digital input/output, analog output, and
totalizer capabilities. You can mix and match modules to get just
the functionality you need right now—then change or add more
channels later as your application grows.
Modules for the DAQ970A are designed to make your testing
easier, faster, and more reliable. Here’s how:
Higher throughput
Our unique architecture incorporates a high-performance
microprocessor on each module, off loading the mainframe
processor and minimizing backplane communications for faster
throughput.
More channels in less space
Surface mount construction and a highly integrated design
minimize the space required for relay drive and interface circuitry.
High density on-module connectors save both board and
connector space normally required by a terminal block. We use
the latest technology to squeeze the most out of the remaining
board space, giving you up to 40 single-ended channels in
roughly the same space used by many data acquisition system
terminal blocks.
Convenient connections
On-module screw-terminal connectors make wiring more
convenient. Built-in strain relief cable routing and cable tie
points keep your wiring secure and safe from accidental tugs and
pulls. An internal analog bus routes signals from any of the low
frequency multiplexers directly to the internal DMM, without the
need for external connections.
Use the chart below to help you pinpoint the modules that meet
your needs.
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Keysight quality
We know you can’t afford instrument downtime due to hardware
failures and unscheduled maintenance. That’s why our engineers
designed reliability into the DAQ970A: A rugged enclosure,
state-of-the-art surface mount construction throughout, reduced
parts counts, and rigorous and thorough testing on all aspects of
the product.
Take the guesswork out of relay maintenance
The DAQ970A uses our proprietary relay maintenance system to
help you to predict relay end-of-life and avoid costly production
line downtime. It automatically counts every individual switch
closure and stores it in nonvolatile memory on each module. You
can query the total number of cycles on any individual channel
so you can schedule maintenance and avoid erratic end-of-life
failures.
Spec interpretation guide
The following pages list the technical specifications for the
Keysight DAQ970A Data Acquisition/System and its modules. The
explanations and examples below are helpful in understanding
how to interpret these specifications:
– Measurement accuracy is specified as percent of reading plus
percent of range, where reading is the actual measured value
and range is the name of the scale (1 V, 10 V, etc.)—not the
full scale value (1.2 V, 12 V, etc.).
– DMM measurement accuracies include all switching errors.
Switching errors are also listed separately in the module
specifications section. Temperature measurement accuracies
include ITS-90 conversion errors. The thermocouple
accuracies include the reference junction error as well.
– Accuracies are listed as either 24-hour, 90-day, or 1-year
specifications. This refers to the length of time since the
instrument’s last calibration. Use the specification that
matches your calibration cycle. The 24-hour specifications
are useful for determining short-term relative performance.
Example 1: Basic dcV accuracy
Calculate the accuracy of the following measurement:
9 V dc input
10 V dc range
1-year accuracy specifications
Normal operating temperature (18 - 28°C)
From the following page, the 1-year accuracy is:
0.003% of reading + 0.0004% or range
Which translates into:
 (0.003/100x9V)+(0.0004/100x10V)=310μV
For a total accuracy of:
 310μV/9V=0.0034%
Example 2: Extreme operating temperature
When the DAQ970A is used outside of its 18 - 28°Ctemperature
range, there are additional temperature drift errors to consider.
Assume the same conditions in Example 1, but at a 35°C operat-
ing temperature.
The basic accuracy is again:
0.003%ofreading+0.0004%ofrange=310μV
Now, multiply the 10 V temperature coefficient from the following
page by the number of degrees outside of operating range for
additional error (non ACAL):
(0.0005% reading + 0.0001% range)
/°C x (35 - 28°C) =
(0.0005% reading + 0.0001% range)
/°C x 7°C =
0.0035% reading + 0.0007% range = 385 µV
Total error is then:
310μV+385μV=695μVor0.0077%
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Example 3: Thermocouple measurement accuracy
Calculating the total thermocouple reading error is easy with
the DAQ970A—just add the listed measurement accuracy to the
accuracy of your transducer. Switching, conversion, and reference
junction errors are already included in the measurement
specification.
For this example, assume a J-type thermocouple input reading 150°C.
From the following page, total error is:
Thermocouple probe accuracy + 1.0°C
The probe vendor specifies accuracy of 1.1°C
or 0.4%, whichever is greater.
Total error is then:
 1.0ºC+1.1ºC=2.1ºCtotal,or1.4%
Example 4: acV accuracy
The acV function measures the true RMS value of the input
waveform, regardless of waveshape. Listed accuracies assume a
sinewave input. To adjust accuracies for non-sinusoids, use the
listed crest factor adder.
For this example, assume a ± 1 V square wave input with
50% duty cycle and a 1 kHz frequency.
Accuracy for 1 V, 1 kHz sinusoid is:
0.05% reading + 0.02% range = 0.7 mV or 0.07%
DAQ970A Accuracy Specifications ±(% of reading + % of range)
Specifications: DC Voltage and resistance. Automatic calibration (ACAL) capable.
Range324 Hour4
Tacal ± 1 °C
90 Days
Tacal ± 5 °C
1 Year
Tacal ± 5 °C
2 year
Tacal ± 5 °C
Non ACAL
Temperature
Coefficient /°C5
With ACAL
Temperature
Coefficient /°C6
Accuracy ± (% of reading + % of range)1
DC voltage2
100 mV 0.0030 + 0.0050 0.0040 + 0.0060 0.0050 + 0.0060 0.0065 + 0.0060 0.0005 + 0.0005 0.0002 + 0.0005
1 V 0.0015 + 0.0006 0.0025 + 0.0006 0.0035 + 0.0006 0.0050 + 0.0006 0.0005 + 0.0001 0.0002 + 0.0001
10 V 0.0010 + 0.0003 0.0021 + 0.0004 0.0030 + 0.0004 0.0045 + 0.0004 0.0005 + 0.0001 0.0002 + 0.0001
100 V 0.0020 + 0.0006 0.0035 + 0.0006 0.0040 + 0.0006 0.0055 + 0.0006 0.0005 + 0.0001 0.0002 + 0.0001
300 V 0.0020 + 0.0020 0.0035 + 0.0020 0.0040 + 0.0020 0.0055 + 0.0020 0.0005 + 0.0001 0.0002 + 0.0001
Resistance2, 7
100 Ω 0.0030 + 0.0050 0.0050 + 0.0060 0.0060 + 0.0060 0.0070+ 0.0060 0.0006 + 0.0005 0.0002 + 0.0005
1 KΩ 0.0020 + 0.0007 0.0030 + 0.0007 0.0040 + 0.0007 0.0050 + 0.0007 0.0006 + 0.0001 0.0002 + 0.0001
10 KΩ 0.0020 + 0.0005 0.0030 + 0.0005 0.0040 + 0.0005 0.0050 + 0.0005 0.0006 + 0.0001 0.0002 + 0.0001
100 KΩ 0.0020 + 0.0005 0.0030 + 0.0005 0.0040 + 0.0005 0.0050 + 0.0005 0.0006 + 0.0001 0.0002 + 0.0001
1 MΩ 0.0020 + 0.0005 0.0060 + 0.0005 0.0070 + 0.0005 0.0080 + 0.0005 0.0010 + 0.0002 0.0002 + 0.0002
10 MΩ 0.010 + 0.001 0.020 + 0.001 0.025 + 0.001 0.030 + 0.001 0.0030 + 0.0004 0.0030 + 0.0004
100 MΩ 0.100 + 0.001 0.250 + 0.001 0.350 + 0.001 0.400 + 0.001 0.1000 + 0.0001 0.0100 + 0.0001
1000 MΩ 2.000 + 0.001 2.500 + 0.001 3.500 + 0.001 4.000 + 0.001 1.0000 + 0.0001 0.1000 + 0.0001
1. Specificationsarefor60-minutewarm-up,integrationsettingof10or100NPLC,auto-zeroon,ACslowfilter.ACALrunwithinthelast2days&901moduleconnectivity.
2. Thesespecificationsincludeoffsetcharacteristicscontributedbythe901Module&backplane(whichaddsDCV+2uV,4-wireohms+2mΩ)
3. 20% over range on all ranges, except 300 VDC, 300 VAC, 1 ADC, 1 AAC, and diode test have 0%.
4. Relative to calibration standards. 24 hrs spec only applicable when calibrated with the same DAQM901 module that is being used to verify spec.
5. Add this for each °C outside the last ACAL ±5 °C.
6. Add this for each °C outside the last external standards calibration ±5 °C.
7. Specifications are for 4-wire ohms function or 2-wire ohms using math null for offset. Without math null, add 2 Ωadditional error in 2-wire ohms function. The 100M and 1G
ohm ranges are 2-wire only. See the manual for low power ohms specification and measurement currents.
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DC Current and Other DC Functions
Range224 Hour3
Tacal 1 °C
90 Days
Tacal 5 °C
1 Year
Tacal 5 °C
2 year
Tacal 5 °C
Temperature
Coefficient /°C5
Accuracy ± (% of reading + % of range)1
Characteristics - typical: DC current
1 uA 0.017 + 0.005 0.040 + 0.005 0.050 + 0.005 0.060 + 0.005 0.0020 + 0.0010
10 uA 0.015 + 0.002 0.040 + 0.002 0.050 + 0.002 0.060 + 0.002 0.0015 + 0.0006
100 uA 0.012 + 0.001 0.040 + 0.001 0.050 + 0.001 0.060 + 0.001 0.0015 + 0.0004
Specifications: DC current
1 mA 0.007 + 0.003 0.030 + 0.005 0.050 + 0.005 0.060 + 0.005 0.0015 + 0.0005
10 mA 0.007 + 0.020 0.030 + 0.020 0.050 + 0.020 0.060 + 0.020 0.0020 + 0.0020
100 mA 0.010 + 0.004 0.030 + 0.005 0.050 + 0.005 0.060 + 0.005 0.0020 + 0.0005
1A 0.050 + 0.006 0.070 + 0.010 0.080 + 0.010 0.100 + 0.010 0.0050 + 0.0010
Characteristics - Typical: Diode Test4
5 V 0.002 + 0.010 0.008 + 0.010 0.010 + 0.010 0.012 + 0.020 0.0010 + 0.0010
Specifications: AC voltage
True RMS AC Voltage6, 7
100 mV, 1 V, 10 V, and 100 V ranges
3 Hz – 5 Hz 0.50 + 0.02 0.50 + 0.02 0.50 + 0.02 0.50 + 0.02 0.010 + 0.003
5 Hz – 10 Hz 0.10 + 0.02 0.10 + 0.02 0.10 + 0.02 0.11 + 0.02 0.008 + 0.003
10 Hz – 20 kHz 0.02 + 0.02 0.04 + 0.02 0.05 + 0.02 0.06 + 0.02 0.007 + 0.003
20 kHz – 50 kHz 0.05 + 0.03 0.06 + 0.03 0.07 + 0.03 0.08+ 0.03 0.010 + 0.005
50 kHz – 100 kHz 0.15 + 0.05 0.15 + 0.05 0.15 + 0.05 0.15 + 0.05 0.060 + 0.008
100 kHz – 300 kHz 1.00 + 0.1 1.00 + 0.1 1.00 + 0.1 1.00 + 0.1 0.200 + 0.020
300 V range
3 Hz – 5 Hz 0.50 + 0.05 0.50 + 0.06 0.50 + 0.06 0.50 + 0.06 0.010 + 0.008
5 Hz – 10 Hz 0.10 + 0.05 0.10 + 0.06 0.10 + 0.06 0.11 + 0.06 0.010 + 0.008
10 Hz – 20 kHz 0.02 + 0.05 0.04 + 0.06 0.05 + 0.06 0.06 + 0.06 0.010 + 0.008
20 kHz – 50 kHz 0.05 + 0.09 0.06 + 0.09 0.07 + 0.09 0.08+ 0.09 0.010 + 0.0012
50 kHz – 100 kHz 0.15 + 0.15 0.15 + 0.15 0.15 + 0.15 0.15 + 0.15 0.060 + 0.020
100 kHz – 300 kHz 1.00 + 0.3 1.00 + 0.3 1.00 + 0.3 1.00 + 0.3 0.200 + 0.050
Specifications: True RMS AC current7, 8
100 uA, 1 mA, 10 mA, 100 mA, 1 A ranges
3 Hz – 5 kHz 0.07 + 0.04 0.09+ 0.04 0.10+ 0.04 0.10 + 0.04 0.015 + 0.006
5 kHz – 10 kHz (typical) 0.10 + 0.04 0.10 + 0.04 0.10 + 0.04 0.10 + 0.04 0.030 + 0.006
1. Specificationsarefor60-minutewarm-up,integrationsettingof10or100NPLC,auto-zeroon,ACslowfilter.ACALrunwithinthelast2days&901moduleconnectivity.
2. 20% over range on all ranges, except 300 VDC, 300 VAC, 1 ADC, 1 AAC, and diode test have 0%.
3. Relative to calibration standards. 24 hrs spec only applicable when calibrated with the same DAQM901 module that is being used to verify spec.
4. Specifications are for the voltage measured at the input terminals. The 1 mA test current is typical. Variation in the current source will create some variation in the voltage
drop across a diode junction.
5. Add this for each °C outside Tcal ±5 °C.
6. Specifications are for sinewave input >0.3% of range and > 1 mVrms. For the 300 Vrms range inputs >1% of range. All VAC ranges limited to 8 x 10^7 Volt–Hz.
7. Low-frequencyperformance:threefiltersettingsareavailable:3Hz,20Hz,200Hz.Frequenciesgreaterthanthesefiltersettingsarespecifiedwithnoadditionalerrors.
8. Specifications are for sinewave input > 1% of range and > 10 µA AC.
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Characteristics - typical: Capacitance
Capacitance7
1.0000 nF 0.50 + 0.50 0.50 + 0.50 0.50 + 0.50 0.50 + 0.50 0.05 + 0.05
10.000 nF 0.40 + 0.10 0.40 + 0.10 0.40 + 0.10 0.40 + 0.10 0.05 + 0.01
100.00 nF 0.40 + 0.10 0.40 + 0.10 0.40 + 0.10 0.40 + 0.10 0.05 + 0.01
1.0000 uF 0.40 + 0.10 0.40 + 0.10 0.40 + 0.10 0.40 + 0.10 0.05 + 0.01
10.000 uF 0.40 + 0.10 0.40 + 0.10 0.40 + 0.10 0.40 + 0.10 0.05 + 0.01
100.00 uF 0.40 + 0.10 0.40 + 0.10 0.40 + 0.10 0.40 + 0.10 0.05 + 0.01
Specifications: Frequency
Frequency1, 3
100 mV, 1 V, 10 V, 100 V, and 300 V ranges3
3 Hz – 10 Hz 0.070 0.070 0.070 0.070 0.0002
10 Hz – 100 Hz 0.030 0.030 0.030 0.030 0.0002
100 Hz – 1 KHz 0.003 0.006 0.007 0.010 0.0002
1 KHz – 300 KHz 0.002 0.005 0.007 0.009 0.0002
Square wave20.001 0.004 0.006 0.008 0.0002
Additional frequency errors (% of reading)1
Aperture (resolution/range) 1 second 0.1 second 0.01 second 0.001 second
3 Hz – 40 Hz 0 0.100 0.160 0.160
40 Hz – 100 Hz 0 0.030 0.160 0.160
100 Hz – 1 KHz 0 0.020 0.200 0.200
1 KHz – 300 KHz 0 0.004 0.030 0.240
Square wave200.000 0.000 0.003
Characteristics - typical: Temperature
Thermocouple DAQ970A
temp ranges
Probe5Ref junction
& DMM accuracy
E –150 °C to 1000 °C 1.0 °C
J –150 °C to 1200 °C 1.0 °C
K –100 °C to 1200 °C 0.9 °C
N –100 °C to 1300 °C 1.0 °C
R 300 °C to 1760 °C 0.5 °C
T–100 °C to 400 °C 0.9 °C
Thermocouple DAQ970A
extended
temp ranges
Probe5Ref junction
& DMM accuracy
E –200 °C to -150 °C 1.4 °C
J –210 °C to -150 °C 1.6 °C
K –200 °C to -100 °C 1.7 °C
N –200 °C to -100 °C 2 °C
R –50 °C to 300 °C 2.9 °C
T –200 °C to -100 °C 1.7 °C
RTD Probe DMM6
PT100 (DIN/IEC 751) [ 4 ] 0.05 C
Thermister
2.2 K, 5 K, 10 K [ 4 ] 0.1 C
Other Measurement Functionality
Strain
Direct strain - measured as 2 or 4 wire ohms (customer enters gauge parameters)4
Bridge strain - voltage measurement (1/4, 1/2 & full bridge, Bending & Poisson configurations, Requires external power supply & bridge completions)4
1. Specifications are for sine wave input unless stated otherwise.
2. Square wave input specified for 10 Hz – 300 KHz for 1 second aperature. For shorter aperatures the minimun frequency requires > 2 cycles.
3. Input > 100 mV. For 10 mV to 100 mV inputs, multiply % of reading error x10. Amplitude 10%–120% of range except 30%–100% for the 300 ACV range. Specifications are for
1-second gate time (7-digits).
4. Accuracy specification depends on Mfg specifications of device.
5. Thermocouple probe accuracies would come from thermocouple supplier and should be selected based on temp ranges required.
6. DMM accuracy assumes measurement with DAQM901A. For 900 module Ohms measurements - see note #2 in page 13.
7. Specifications are for using Math Null zeroing. High dissapation factor capacitors may show different results than a single frequency measurement. Film capacitors usually
have lower dissapation factors than other dielectrics.
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Switch Modules
DAQM900A DAQM901A DAQM902A DAQM903A DAQM904A DAQM905A DAQM908A
General
Number of channels 20 20 + 2 16 20 (SPDT) 4x8 (2 wire) Dual 1x4(50
ohm)
40 (1 wire)
Scanning speed 450 Ch/s 80 ch/s 250 ch/s 100 ch/s
Open/close speed 120 ch/s 120 ch/s 120 Ch/s 120 ch/s 60 ch/s 70 ch/s
Internal DMM measurement functions supported
Voltage AC/DC Yes3, 4 Yes Yes No No No Yes
Current AC/DC No Yes No No No No No
Frequency/period Yes Yes Yes No No No Yes
Ohms - 2 wire Yes2Yes Yes5No No No Yes
Ohms - 4 wire Yes2Yes Yes5No No No No
Thermocouple Yes Yes Yes No No No No
RTD 2-wire No Yes Yes No No No Yes
RTD 4-wire No Yes Yes No No No No
Thermistor No Yes Yes No No No Yes
Capacitance No Yes Yes No No No Yes
Characteristics - typical: Input
Max voltage (dc, ac rms) 120V 300V 300 V 300 V 300 V 42 V 300 V
Max current (dc, ac rms) .02 A 1 A 50 mA 1 A 1 A .7 A 1 A
Power (W, VA) 2.4 W 50 W 2 W 50 W 50 W 50 W 50 W
Characteristics - typical: DC
Offset voltage
(incremental to DMM specs)
< 4 uV 0 uV7< 4 uV < 1 uV < 1 uV < 4 uV < 1 uV
Offset resistance (4-wire)
(incremental to the DMM specs)
< 4 mΩ 0 mΩ7< 4 mΩ
Initial closed channel R < 50 ohms < 1.0 ohms < 1.0 ohms < 0.2 ohms < 1.0 ohms < .5 ohms < 1.0 ohms
Isolation Ch-Ch, Ch-Earth > 10 G ohm > 10 G ohm > 10 G ohm > 10 G ohm > 10 G ohm > 1 G ohm > 10 G ohm
Characteristics - typical: AC
Ch-Ch crosstalk (@ 1 Mhz) NA - 50 db - 55 db - 60db - 50 db -110 db - 25 db
Capacitance (Hi-Lo) NA < 50 pF < 65 pF 10 pF < 50 pF < 20 pF < 50 pF
Capacitance (Lo-Earth) NA < 150 pF < 135 pF < 80 pF < 80 pF NA < 80 pF
Volt-Hertz limit 10^8 10^8 10^8 10^8 10^8 10^10 10^8
Characteristics - typical: Other
T/C CRJ accuracy
Switch life (no load) Unlimited within
FET Banks6
100 M 100 M 100 M 100 M 5 M 100 M
Switch life (rated load) Unlimited within
FET Banks6
100 K 100 K 100 K 100 K 100 K 100 K
DAQM905A: Characteristics - Nominal
10 MHz 100 MHz 500 MHz 1 GHz 1.5 GHz 2 GHz
AC
Insertion loss (db) -0.1 -0.4 -0.6 -1 -1.2 -3
SWR 1.02 1.05 1.2 1.2 1.3 1.4
1. DMM accuracy assumes measurement with DAQM901A. For 900 module Ohms measurements - see note 2.
2. The series resistance of the DAQM900A limits the use of the 100 ohm and 1kohm resistance range. The precision of 2 W ohms is limited by this on resistance. Keysight
recommends the use of 4-wire ohms for these 2 ranges. Maximum resistance range of DAQM900A is 1 Mohm The 10M ohm and above ranges are not specified on this
module.
3. For AC Volts - The input impedance of this module decreases with frequency. A source impedance of 5 ohms or less will maintain specifications over the full frequency range.
A source impedance of 50 ohms or less will maintain specifications to 5 KHz.
4. For DC Volts - Additional settling time may be needed for short integration time and higher source impedance.
5. Resistancerange≥1MΩisTypical
6. This module has an Armature backplane & 2 W/4 W relays with 100 M operational life (FET life within banks is unlimited). Limiting backplane & 2 W/4 W relay cycling is
recommended.
7. Absolute Offset is <2uV. Incremental Offset to 901 = 0 uV. 2uV included in DCV’s % of range specs.
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DAQM907A
Measurement Functionality
Digital I/O (Port 1,2) 16 bits, Input or Output, non-isolated
Totalizer 100 kHz Input
Analog outputs 2 channels, ± 12 V or ± 24 mA
Characteristics - typical : [1, 2, 3, 4]
DAC (output & readback) Accuracy
Voltage ± 0.027% of output + 4.4 mV
Current ± 0.115% of output + 4.4 uA
Characteristics - nominal
DIO Port 1, 2 8 bit, input or output, nonisolated
Vin(L) < 0.8 V (TTL)
Vin(H) > 2.0 V (TTL)
Vout(L) < 0.8 V @ Iout = -400 mA
Vout(H) > 2.4 V @ Iout = 1 mA
Vin(H) max < 42 V with external open drain pull-up
Alarming Maskable pattern match or state change
Speed 4 ms (max) alarm sampling
Latency 5 ms (typical) to DAQ970A alarm output
Read/write speed 95/s
Max count 2^26 - 1
Totalize input 100 kHz (max) Rising or falling edge, programmable, min H or L time 5uS
Signal level 1 Vp-p (min) 42 Vpk (max)
Threshold 0 V or TTL, jumper selectable
Gate Input TTL-Hi, TTL-Lo, or none
Count reset Manual or Read + Reset
Read speed 85/s
DAC 1, 2 ± 12 V or ± 24 ma nonisolated
Resolution 100uV, 0.2uA
Voltage mode current 15 mA max per channel
Current mode compliance 12 V
Settling time 1 ms to 0.01% of output
1. ACAL required within the last 30 days to achieve performance accuracies.
2. ACAL assumes ± 2C with no additional TC adders.
3. Mainframe DMM - calibrated through the 901 module.
4. Standard warranted performance is 1 year, Tcal ± 5 °C
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Characteristics - Nominal: Single Channel Reading Rates to I/O or Internal Memory
DAQ970A DAQ970A
Int. memory (100K) LAN, USB
Single ch ASCII rdgs - DCV, Ohms 5000/s 5000/s
Single ch ASCII rdgs - ACV, ACI 50/s 50/s
Single ch ASCII rdgs - Freq, period 80/s 80/s
Single ch (chg Scale) > 25/s > 25/s
Single ch (chg Func) > 12/s > 12/s
Characteristics - Nominal: Scanning Measurement Rates to I/O or Internal Memory
Scanning DCV or Ohms channels
900A 450 450
901A 80 80
902A 250 250
902A (INIT, FETCh) 240 240
902A (MEAS) 240 240
902A (scale, alarm) 220 220
902A (Alt channel) 80 80
908A 80 80
Scanning ACV channels
900A 90 90
901A 50 50
902A 90 90
908A 50 50
Scanning temperature - thermistor or TC channels
900A 150 150
901A 50 50
902A 150 150
Scanning digital in TOTALIZER channels
907A (Digital IN) 275 275
907A (Totalizer) 240 240
Characteristics - Nominal: Data out of Memory (FETCh of 50K readings)
Single channel DAQ970A over USB DAQ970A over LAN
Readings 55000/s 120000/s
Rdgs (with timestamp) 35000/s 60,000/s
Rdgs (format option ON) 25000/s 50000/s
Characteristics - Measured: Noise performance for DC voltage, DC current, and resistance
Integration time Digits1RMS Noise adder (% of range + fixed base)2
DC volts Ohms DC current3
100 PLC/1.67 s (2 s) 6.5 000
10 PLC/167 ms (200 ms) 6.5 000
1 PLC/16.7 ms (20 ms) 6.5 0.0001 + 0.5 uV 0.0001 + 0.5 mΩ 0.0006 + 0 .02 nA
0.2 PLC/3 ms (3 ms) 6.5 0.0005 + 3 uV 0.0010 +10 mΩ 0.0050 + 5 nA
0.06 PLC/1 ms (1 ms) 6 0.0020 + 3 uV 0.0020 + 10 mΩ 0.0070 + 10 nA
0.02 PLC/400 µs (300 µs) 6 0.0020 + 3 uV 0.0020 + 10 mΩ 0.0070 + 10 nA
1. For DCV on the 10 volt range with zero volts input and auto zero on.
2. RMS noise adder measured with zero volts input and auto zero on.
3. The follow DCI ranges have these additional multipliers: The 10 mA by 5x, the 100 mA by 2x.
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Characteristics - Measured: DC and AC Current Burden Voltage at Full Scale.
DC current range Burden voltage
1 µA < 0.0011 V
10 µA < 0.011 V
100 µA < 0.11 V
1 mA < 0.11 V
10 mA < 0.027 V
100 mA < 0.27 V
1 A < 0.7 V
Characteristics - Nominal: Other
A/D linearity: 0.0001% of reading + 0.0001% of range (measured)
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General Characteristics
Line power
Power supply (Mains supply voltage fluctuation is
not allowed to exceed ± 10%)
100 - 240 VAC
Power line frequency 50/60/400 Hz
Power consumption 45 watts
Environment
Operating environment Full accuracy - 0 to 55 C
Operating humidity Full accuracy to 80% R.H. at 40 °C non–condensing
(Humidity degrades linearly to 50%RH at 55 °C non-condensing)
Operating altitude up to 3,000 m
Storage temperature -40 to +70 C
Mechanical
Rack dimensions 212.6 mm x 88.5 mm x 348.3 mm
Bench dimensions 261.0 mm x 103.7 mm x 378.0 mm
Weight 4.1 kg
Regulatory
Safety EN 61010-1:2010 (3rd Edition)
ANSI/ISA-61010-1 (82.02.01) Third Edition
ANSI/UL 61010-1 Third Edition
CAN/CSA-C22.2 No. 61010-1 Third Edition
EN 61010-2-030:2010 (1st Edition)
ANSI/ISA-61010-2-030 (82.02.03) First Edition
ANSI/UL 61010-2-030 First Edition
CAN/CSA-C22.2 No. 61010-2-030 First Edition
Refer to Declaration of Conformity for current revisions
Pollution Degree 2
EMC IEC 61326
EN 61326
CISPR
ICES-001
AS/NZS 2064.1
Refer to Declaration of Conformity for current revisions
Acoustic noise - Nominal 35 dBA
Triggering conditions
External Delay
Jitter
Minimum Pulse width
Maximum rate
Voltmeter complete Polarity
Pulse width
Computer interfaces LXI (rev 1.4)
USB
LAN
Language SCPI-1999, IEEE-488
34970A/72A compatible
Front panel USB host port USB 2.0 - high speed mass storage (MSC) class device
Capability: Import/export instrument configuration files, save volatile readings and screen captures
Math Functions
Display
Real-time Clock
Software available IO Libraries: www.keysight.com/find/IOLibraries
BenchVue: www.keysight.com/find/benchvue
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Multiplexer Actuator Matrix RF multiplexer Multifunction
DAQM900A DAQM901A DAQM902A1DAQM908A DAQM903A DAQM904A DAQM905A DAQM907A
General
Number of channels 20 20 + 2 16 40 20 4 x 8 Dual 1 x 4 See page 23
for module
specifications
2/4 wire 2/4 wire 2/4 wire 1 wire SPDT 2 wire 50 Ω
Connects to internal DMM ● ● ● ●
Scanning speed 450 ch/s 80 ch/s 250 ch/s [1] 100 ch/s
Open/close speed 120/s 120/s 70/s 120/s 120/s 60/s
Input
Voltage (dc, ac rms)2120 V 300 V 300 V 300 V 300 V 300 V 42 V
Current (dc, ac rms) 1 A 1 A 50 mA 1 A 1 A 1 A 0.7 A
Power (W, VA) 50 W 50 W 2 W 50 W 50 W 50 W 20 W
DC characteristics
Offset voltage3< 3 uV < 3 uV < 6 uV < 3 uV < 3 uV < 3 uV < 6 uV
Initial closed channel R3< 1 Ω < 1 Ω < 1 Ω < 1 Ω < 0.2 Ω < 1 Ω < 0.5 Ω
Isolation ch-ch, ch-earth > 10 GΩ > 10 GΩ > 10 GΩ > 10 GΩ > 10 GΩ > 10 GΩ > 1 GΩ
Risetime 300 ps < 300 ps
Signal delay < 3 ns < 3 ns
Capacitance HI - LO < 50 pF < 50 pF < 50 pF < 50 pF < 10 pF < 50 pF < 20 pF
LO - Earth < 80 pF < 80 pF < 80 pF < 80 pF < 80 pF < 80 pF —
Volt-Hertz limit 1081081081081081081010
Other
T/C cold junction accuracy3
(typical) 0.8 °C 0.8 °C 0.8 °C
Switch life No load (typical) 100 M 100 M 100 M 100 M 100 M 5 M
Rated load (typical)7100 k 100 k 100 k 100 k 100 k 100 k
Temperature Operating all cards: 0 to 55 °C
all cards: –40 to 70 °C
all cards: 40 °C to 80% RH
Storage
Humidity (non-condensing)
1. Not recommended for connection to ac line without external transient suppression. Up to 250 ch/s to internal memory. See scanning rates for measurement
condition and rate on each instrument.
2. Channel-to-channel or channel-to-earth
3. Errors included in DMM measurement accuracy specifications
4. 50Ωsource,50Ωload
5. Bandwidth direct to card SMB connectors
6. Isolation within channel 1 to 20 or 21 to 40 banks is –40 dB
7. Applies to resistive loads only
Modules characteristics
The Keysight DAQ970A accuracy specifications already include
the switching offset and reference junction errors shown below.
These errors are listed separately for determining system error
with external measurement devices.
Up to three modules, in any combination, can be inserted into
a single mainframe. The DAQ970A’s internal DMM connections
are accessible only through the DAQM900A, DAQM901A,
DAQM902A, and DAQM908A low-frequency multiplexers.
On-module screw terminals accept wire sizes from 16 gage to
22 gage. Twenty-gage wire is recommended for high channel
count applications. The DAQM905A RF Multiplexer uses SMB
connectors. A standard set of (10) BNC-to-SMB adapter cables is
provided with each RF module for convenient BNC connections.
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Multiplexer selection guide
Choose between the broad functionality of the DAQM901A,
the high speed scanning of the DAQM902A, or the DAQM900A
solid-state module, and the single-ended density of the
DAQM908A. These four modules are the only way to connect
to the DAQ970A internal DMM. They can be used to scan with
external instruments as well.
All multiplexer modules employ break-before-make scanning,
ensuring only one closed channel (or channel pair) at a time.
DAQM900A 20-Channel FET multiplexer module
20-Channel General Purpose Multiplexer
– 450 ch/s scanning
– Two- and four-wire scanning
– Built-in thermocouple reference junction
– 120 V switching
The DAQM900A module is divided into two banks of 10 two-wire
channels each. All 20 channels switch both HI and LO inputs, thus
providing fully isolated inputs to the internal DMM or an external
instrument. During 4-wire resistance measurements, channels
from Bank A are automatically paired with channels from Bank B
to provide the source and sense connections. The module has a
built-in thermocouple reference junction to minimize errors due to
thermal gradients when measuring thermocouples.
DAQM900A DAQM901A DAQM902A DAQM908A
Number of channels 20 20 + 2 16 40
Max scan speed 450 ch/s 80 ch/s 250 ch/s 100 ch/s
Number of contacts 2 or 4 2 or 4 2 or 4 1
Temperature
Thermocouple ●●●
2-wire RTD ● ●
4-wire RTD ● ●
Thermistor ● ●
dc Volts ●●●●
ac Volts ●●●●
2-wire Ohms ●●●●
4-wire Ohms ●●●
Frequency ●●●●
Period ●●●●
dc current ●
ac current ●
capacitance ●●●
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DAQM901A
20-Channel General Purpose Multiplexer
– 80 ch/s scanning
– Two- and four-wire scanning
– Built-in thermocouple reference junction
– 300 V switching
The Keysight DAQM901A is the most
versatile multiplexer for general
purpose scanning. It combines dense, multifunction
switching with 80-channel/second scan rates
to address a broad spectrum of data acquisition
applications.
Two- and four-wire channels can be mixed on the
same module. Two additional fused inputs (22 chan-
nels total) route up to 1 A of current to the internal
DMM, allowing ac and dc current measurements
without the need for external shunt resistors.
Backplane switches
Internal
DMM input
01
10
Com
H
L
H
L
H
L
H
L
H
L
H
L
I
L
I
L
I
L
I
L
H
L
H
L
T
Com
(4W sense)
11
20
21
Current
channels
22
Com
(Current)
Fuse
Fuse
Internal
DMM input
(4W sense)
Internal
DMM input
(Current)
Reference
junction
sensor
Channel switches
Bank switch
Shunt switches
DAQM902A
16-Channel High-Speed Multiplexer
– Scanning up to 250 ch/s
– Two- and four-wire scanning
– Built-in thermocouple reference junction
The Keysight DAQM902A employs reed relays to
achieve scan rates up to 250 channels per second.
Use this module for high-throughput automated test
applications as well as high-speed data logging and
monitoring tasks.
Sixteen two-wire inputs switch up to 300 V. Two-
and four-wire channels may be mixed on the same
module. User provided shunt resistors are required
for current measurements.
Backplane switches
Internal
DMM input
01
08
Com
Com
(4W sense)
09
16
Internal
DMM input
(4W sense)
Reference
junction
sensor
Channel switches
Bank switch
H
L
H
L
T
H
L
H
L
H
L
H
L
H
L
H
L
Note: Not recommended for connection to ac line without
external transient suppression.
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