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National Instruments NI-9251 C Series voltage input module
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National Instruments · CompactDAQ / CompactRIO

NI-9251

The NI-9251 is a two-channel, 24-bit C Series voltage input module with a 3 Vrms input range and simultaneous sampling up to 102.4 kS/s per channel. It provides mini XLR connections and AC/DC coupling.

ManufacturerNational Instruments
ModelNI-9251
Product TypeC Series voltage input module
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Input channels2 differential
Resolution24 bit
Input range3 Vrms
Maximum sample rate102.4 kS/s/ch, simultaneous
Signal connectionmini XLR
Input couplingAC or DC
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Overview

Product overview

Key product information and technical features.

The NI-9251 combines two differential analog input channels with 24-bit conversion and simultaneous acquisition. Its 3 Vrms range and AC/DC coupling support voltage signal acquisition through mini XLR connections.

As an NI C Series module, the NI-9251 fits into supported CompactDAQ and CompactRIO systems. System selection must account for the specific chassis, programming mode, and driver support; the module has no input isolation.

  • Two differential analog input channels.
  • Simultaneous acquisition at up to 102.4 kS/s per channel with 24-bit resolution.
  • 3 Vrms voltage input range with AC and DC coupling.
  • Mini XLR signal connections.
Verified specifications

Technical data

Verified product specifications.

Differential analog input channels2 channels
Analog input resolution24 bit
Analog input range3 Vrms
Maximum sample rate per channel102.4 kS/s/ch
Simultaneous samplingYes
Input couplingAC/DC
Front connectionmini XLR
Input isolationNone
Condition & included items

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Compatibility

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National Instruments

Manufacturer

CompactDAQ / CompactRIO

Supported system platforms, subject to hardware and programming-mode requirements

NI-9251

C Series two-channel voltage input module

Signal interface

Mini XLR inputs with AC/DC coupling

Check the exact chassis and programming mode in NI's compatibility table before system integration.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI 9251 with mini XLR Calibration ProcedureManufacturer Procedure · download.ni.com
Open →
C Series Module and CompactDAQ or CompactRIO Hardware CompatibilityHardware Compatibility Guide · ni.com
Open →
NI-9251 Product CertificationsProduct Certification Index · ni.com
Open →
Signal-Based Synchronization of Analog Input C Series Modules with NI-DAQmx in LabVIEWTechnical resource
Open →
Shipping, warranty & returns

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Warranty
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Returns
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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Does the NI-9251 sample both channels simultaneously?

Yes. The NI-9251 provides simultaneous sampling at up to 102.4 kS/s per channel with 24-bit resolution.

What input range and coupling does the NI-9251 provide?

The module has a 3 Vrms input range and supports AC and DC coupling.

What connectors does the NI-9251 use?

The NI-9251 uses mini XLR connections for its analog inputs.

Are the NI-9251 inputs isolated?

No. NI lists no continuous isolation for the NI-9251.

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