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National Instruments NI 9237 C Series Strain/Bridge Input Module
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National Instruments · CompactDAQ and CompactRIO

NI 9237

The NI 9237 is a four-channel C Series strain/bridge input module with simultaneous 24-bit acquisition at up to 50 kS/s per channel. It provides signal conditioning and excitation for bridge-based sensors in CompactDAQ and CompactRIO systems.

ManufacturerNational Instruments
ModelNI 9237
Part Number779521-01
Product TypeC Series Strain/Bridge Input Module
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30-Day Warrantystandard coverage
30-Day Returnspolicy applies
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Analog inputs4 simultaneous bridge channels
Maximum sample rate50 kS/s per channel
Resolution24-bit
Input range±25 mV/V
779521-01 connectionFour RJ50 sensor connectors
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Overview

Product overview

Key product information and technical features.

Designed for strain and load measurements, the NI 9237 powers and acquires signals from up to four bridge-based sensors simultaneously. Its independent channel ADCs eliminate interchannel phase delay.

NI offers RJ50 and D-SUB versions of this model. The catalog-associated part number 779521-01 identifies the RJ50 version; connection accessories should be selected for the actual module variant.

  • Built-in excitation for half-bridge and full-bridge sensors.
  • Remote sensing and shunt calibration functions help address bridge wiring resistance errors.
  • Analog and digital filtering reject out-of-band signals.
  • Quarter-bridge measurements are supported with appropriate external bridge-completion accessories.
Verified specifications

Technical data

Verified product specifications.

Analog input channels4 channels
ADC resolution24 bit
Maximum sampling rate per channel50 kS/s
Sampling architectureSimultaneous
Bridge input range±25 mV/V
Operating temperature-40 to 70 °C
Isolation architectureBank isolated from earth ground; channels are not isolated from each other
Channel-to-earth ground isolation60 VDC
Front connection for 779521-014 RJ50 connectors
Condition & included items

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Condition

Confirmed per unit.

Included

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Revision

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Compatibility

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National Instruments

Manufacturer

CompactDAQ / CompactRIO

System platforms

C Series

Modular I/O family and interface

NI 9237

Strain/bridge analog input module

Do not insert RJ45 Ethernet connectors into the RJ50 version; NI warns that they can damage the connector.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI-9237 Official Product PageProduct Page · ni.com
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NI 9237 DatasheetDatasheet · download.ni.com
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NI-9237 Dimensional DrawingsDimensional Drawings And CAD Models · ni.com
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C Series RJ45/RJ50 Cable and Accessory GuideTechnical resource
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NI Guidance on Ethernet Cables and NI-9237 ConnectorsTechnical resource
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Shipping, warranty & returns

Commercial terms

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Warranty
30-Day Warranty. Standard coverage applies.
Returns
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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Is the NI 9237 a 16-channel voltage input module?

No. It has four simultaneous bridge input channels, 24-bit resolution, a ±25 mV/V input range, and a maximum rate of 50 kS/s per channel.

Can the RJ50 version measure quarter-bridge strain gauges?

Yes, with suitable external completion accessories. NI lists the NI 9944 for 120 Ω quarter bridges and the NI 9945 for 350 Ω quarter bridges.

Can I use a standard RJ45 Ethernet cable?

No. NI warns that RJ45 connectors can damage the NI 9237 RJ50 connector. Use the appropriate RJ50 cable.

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