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NI-9251, Simultaneous, 2-Channel, C Series Voltage Input Module
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.
Model | NI-9251 |
---|---|
Manufacturer | National Instruments |
Part Number | 783814-01 |
Type | C Series Voltage Input Module |
Differential Analog Input Channels | 2 |
Maximum Sample Rate | 102.4 kS/s per channel |
Analog Input Resolution | 24 bits |
Front Connector | Mini-XLR |
Weight | 4.9 oz. |
Warranty | 2-3 Year Warranty |
NI-9251 Manual | User Manual and Maintenance Manual Available for Download |
Price | Contact a sales representative for a quote. |
Associated part numbers for NI-9251:
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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