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National Instruments NI 9944, NI 9945 Quarter-bridge completion accessory
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National Instruments · NI C Series strain/bridge measurement systems

NI 9944, NI 9945

The NI 9944 and NI 9945 are external quarter-bridge completion accessories for strain measurements with C Series Strain/Bridge Input Modules. The NI 9944 provides 120 Ω completion resistance; the NI 9945 provides 350 Ω.

ManufacturerNational Instruments
ModelNI 9944, NI 9945
Part Number194738-01 · 194738-02
Product TypeQuarter-bridge completion accessory
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30-Day Warrantystandard coverage
30-Day Returnspolicy applies
Technical Supportmodel & compatibility help
FunctionExternal quarter-bridge completion
NI 9944 resistance120 Ω
NI 9945 resistance350 Ω
VariantsStandard and high-accuracy versions
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Overview

Product overview

Key product information and technical features.

These accessories supply the external completion resistor needed for quarter-bridge strain-gauge measurements. Select the NI 9944 for a 120 Ω gauge or the NI 9945 for a 350 Ω gauge; the completion resistor must match the gauge's nominal resistance.

NI documents their use with the NI 9237 strain/bridge input module. Connection requirements depend on the module variant: RJ50 models support the accessory connection, while DSUB models require wiring through the NI 9923 terminal block rather than direct attachment.

  • Model-specific completion resistance for 120 Ω or 350 Ω quarter-bridge strain gauges.
  • Standard and high-accuracy variants allow selection by measurement requirements.
  • NI provides connection guidance for both two-wire and three-wire strain gauges.
Verified specifications

Technical data

Verified product specifications.

NI 9944 nominal completion resistance120 Ω
NI 9945 nominal completion resistance350 Ω
NI 9944 standard variant part number194738-01
NI 9944 high-accuracy variant part number194738-02
NI 9945 standard variant part number194739-01
NI 9945 high-accuracy variant part number194739-02
Condition & included items

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Confirmed per unit.

Included

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Revision

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Compatibility

Complete the measurement chain

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National Instruments

Manufacturer

C Series Strain/Bridge Input Modules

Measurement module family

NI 9944 / NI 9945

External quarter-bridge completion accessories

Resistance selection

Match 120 Ω gauges with NI 9944 and 350 Ω gauges with NI 9945.

Confirm the exact accessory variant, gauge resistance, and measurement-module connector before selecting connection hardware.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI 9926/9944/9945 User GuideUser Guide · download.ni.com
Open →
NI-9944 Product DetailsManufacturer Product Page · ni.com
Open →
NI-9945 Product DetailsManufacturer Product Page · ni.com
Open →
Connecting Strain Gauges to NI-9237 Using NI-9926/9944/9945Technical resource
Open →
Using NI 9926/9944/9945 With NI 9237 DSUB VariantsTechnical resource
Open →
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.

What is the difference between NI 9944 and NI 9945?

The NI 9944 provides a 120 Ω quarter-bridge completion resistor, while the NI 9945 provides a 350 Ω resistor. Choose the model that matches the nominal resistance of the strain gauge.

Are these standalone data acquisition modules?

No. NI identifies both models as quarter-bridge completion accessories for C Series Strain/Bridge Input Modules.

Can they connect directly to an NI 9237 DSUB variant?

No. NI specifies wiring through the NI 9923 terminal block for the NI 9237 DSUB variants identified as 780264-01 and 780264-02.

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