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NI-9251
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NI-9251, Simultaneous, 2-Channel, C Series Voltage Input Module

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National Instruments NI-9251 C Series Voltage Input Module

The National Instruments NI-9251 (Part number: 783814-01) is a 2-Channel Voltage Input Module from the C Series. This model comes featured with mini XLR connectivity- a low-distortion input channel that offers high dynamic range measurements required in the testing and evaluation of modern audio outputs. Unlike other sound-card based systems, the National Instruments NI-9251 can be deployed quickly to ensure long-term measurement repeatability and improved test system uptime. For a better low-noise performance, the differential input in the NI 9251 is provided through a mini XLR connector.

This Voltage Input Module is designed for CompactRIO and CompactDAQ systems, offering up to 102.4 kS/s update rate, 3 Vrms input range, and 24-bit resolution. Coupling the NI-9251 with an NI-9260 through the mini XLR connector will allow users to perform a comprehensive range of measurements typically done through expensive, high-end audio analyzers. This module measures signals on AI+ with respect to AI- and its ground pin is internally connected to chassis ground. The AI+ and AI- come with a 2 MΩ resistor, also connected to chassis ground. Thus, users can connect either a ground differential signal or a floating differential signal to the input.

 The National Instruments NI-9251 module offers ±30 V overvoltage protection on both of its channels. This device offers software-selectable AC/DC input coupling and controls the maximum idle channel noise around 8.5 μVrms.  In addition, this module operates with 2 MΩ single ended and 4 MΩ differential input resistance and 940 pF input capacitance from the input pin to ground.

ModelNI-9251
ManufacturerNational Instruments
Part Number783814-01
TypeC Series Voltage Input Module
Differential Analog Input Channels2
Maximum Sample Rate102.4 kS/s per channel
Analog Input Resolution24 bits
Front ConnectorMini-XLR
Weight4.9 oz.
Warranty2-3 Year Warranty
NI-9251 ManualUser Manual and Maintenance Manual Available for Download
PriceContact a sales representative for a quote.

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National Instruments NI-9251 Frequently Asked Questions

 

Question: What is the analog input voltage range of the NI 9251?

 

Answer: The analog input voltage range of the NI 9251 is 3 Vrms.

 

Question: Are any accessories required to operate the NI-9251?

 

Answer: To operate the NI-9251, the user needs an extended temperature MXLRF-MXLRF Cable, an extended temperature MXLRF-XLRF Cable, an extended temperature MXLRF-XLRM Cable, or an extended temperature BNCM-MXLRF Cable. Each cable is available in various lengths.

 

Question: Which applications are ideal for the NI 9251?

 

Answer: The NI 9251 is ideal for noise, vibrations, and harshness and audio testing.

 

Question: Which kinds of signals can be connected to the NI-9251?

 

Answer: Floating differential and grounded differential signals can be connected to the NI-9251.

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MI-9251, NO-9251, NI-9Q51, NI-92T1, NI-92Y1
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