National Instruments NI-9237 C Series Strain/Bridge Input Module

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National Instruments · CompactDAQ / CompactRIO

NI-9237

The NI-9237 acquires four bridge-sensor channels simultaneously at up to 50 kS/s/channel with 24-bit conversion. It integrates bridge signal conditioning for CompactDAQ and CompactRIO systems.

ManufacturerNational Instruments

ModelNI-9237

Product TypeC Series Strain/Bridge Input Module

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Inputs4 bridge analog input channels

Sampling50 kS/s/channel, simultaneous

Resolution24 bit

Input range±25 mV/V

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Overview

Product overview

Key product information and technical features.

The NI-9237 supports strain and load measurements from bridge-based sensors. Its remote sensing helps compensate for excitation-lead resistance.

The catalog identifies a D-Sub connection, but its coating information conflicts with the tagged part number. NI identifies 780264-02 as conformal-coated and 780264-01 as non-coated; confirm the module label before selecting variant-specific wiring.

Simultaneous acquisition across all four channels.
Programmable internal excitation.
Half- and full-bridge support; quarter bridges require external completion.

Verified specifications

Technical data

Verified product specifications.

Analog input channels	4 channels
ADC resolution	24 bit
Typical input range	-25 to +25 mV/V
Maximum sample rate using internal timebase	50 kS/s/channel
Internal excitation settings	2.5, 3.3, 5, 10 V
Maximum total internal excitation power	150 mW

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Compatibility

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National Instruments

Manufacturer

CompactDAQ / CompactRIO

Host platforms

NI-9237

C Series bridge input module

D-Sub connectivity

NI lists the NI-9923 front-mount terminal block for both D-Sub part numbers, 780264-01 and 780264-02.

Confirm the connector and part number before choosing terminal blocks or bridge-completion accessories.

Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI-9237 Product Page and Variant ComparisonProduct Page · ni.com

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NI 9237 DatasheetDatasheet · download.ni.com

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NI 9237 Getting Started GuideGetting Started Guide · download.ni.com

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Using Quarter-Bridge Completion Accessories with the D-Sub NI-9237Technical resource

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Configuring a Load Cell in MAX with the NI-9237Technical resource

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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Can the D-Sub NI-9237 measure quarter-bridge strain gauges?

Yes, with external quarter-bridge completion and the module configured for half-bridge completion. NI states that NI-9926, NI-9944, and NI-9945 accessories cannot connect directly to the D-Sub variant; wiring through the NI-9923 is required. The completion resistance must match the gauge.

Does the catalog establish which D-Sub variant this unit is?

No. The tags specify 780264-02, which NI identifies as conformal-coated, while the legacy description states no conformal coating. The model remains NI-9237, but the exact variant requires label confirmation.