NI USB-6251 BNC 16-Bit, 1.25 MS/s M Series, Integrated BNC, External Power

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  • National Instruments recommends using the NI USB-6361 for all new applications.
  • 8 differential BNC analog inputs (16-bit), 1.25 MS/s single-channel (1 MS/s aggregate)
  • 2 BNC analog outputs (16-bit, 2.8 MS/s); 24 digital I/O (8 clocked, 8 BNC); 32-bit counters
  • NI Signal Streaming for bidirectional high-speed data streams over USB; OEM version available
  • Compatible with LabVIEW, ANSI C/C++, C#, Visual Basic .NET, and Visual Basic 6.0
  • NI-DAQmx driver software and NI SignalExpress LE interactive data-logging software
  • View Data Sheet  |  Specifications  
  • View Support Resources
The NI USB-6251 BNC is a USB high-performance M Series multifunction DAQ module optimized for superior accuracy at fast sampling rates. It is ideal for applications such as data logging and benchtop sensor measurements. It provides 8 analog input, 2 analog output, 8 digital I/O, 1 APFI, and 2 user-defined BNC terminals.

The USB-6251 BNC is designed specifically for mobile or space-constrained applications. Plug-and-play installation minimizes configuration and setup time, while direct screw-terminal connectivity helps keep costs down and simplifies signal connections.

This module also features new NI Signal Streaming technology, which allows for DMA-like bidirectional high-speed streaming of data across the USB bus. For more information about NI Signal Streaming, see the Resources tab.

Each module also features an OEM version. See the Resources tab or use the left navigation to get pricing and technical information. Certified power supply included.

Driver Software
NI-DAQmx driver and measurement services software provides easy-to-use configuration and programming interfaces with features such as DAQ Assistant to help reduce development time. Browse the information in the Resources tab to learn more about driver software or download a driver. M Series devices are not compatible with the Traditional NI-DAQ (Legacy) driver.

Application Software
Every M Series DAQ device includes a copy of NI SignalExpress LE so you can quickly acquire, analyze, and present data without programming. In addition to SignalExpress, M Series DAQ devices are compatible with the following versions (or later) of NI application software: LabVIEW 7.1, LabWindows™/CVI 7.x, or Measurement Studio 7.x. M Series DAQ devices are also compatible with Visual Studio .NET, C/C++, and Visual Basic 6.0.

The mark LabWindows is used under a license from Microsoft Corporation. Windows is a registered trademark of Microsoft Corporation in the United States and other countries.

View Data Sheet | View Pricing and Purchasing Information

Part Number Description Est Ship  US Dollars Qty
780115-01NI USB-6251 M Series DAQ Device, BNC Term, U.S. (120 V)5 - 10$ 2,483.00
779697-02BNC Male (plug) to BNC Male (plug) 2m cables, 4 pack of 183882-021 - 3$ 173.00
780315-01Rugged Carrying Case for Portable Instrumentation5 - 10$ 180.00
780214-01Externally Powered USB M Series Panel Mounting Kit5 - 10$ 59.00

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Extended Warranties

National Instruments designs and manufactures all products to minimize failures, however unexpected failures can still occur. Extended warranties provide a fixed economical price at the time of system purchase, covering any repair costs for up to three years. In addition, they offer the following benefits:

  • Significant cost savings compared to individual repair incidents
  • Fault location, diagnostics, and repair by NI any time the system product fails
  • All parts and labor costs covered as well as any adjustments needed to restore the hardware to manufacturing specifications

For more information about your warranty options:


NI recognizes the need to maintain properly calibrated devices for high-accuracy measurements. NI provides manual calibration procedures, services to recalibrate your products, and automated calibration software to calibrate many NI measurement products.


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Repair Services

Return your registered product under warranty at no additional labor and parts cost. NI offers fault location, diagnostics, and repair any time the system fails as well as any adjustments needed to restore the hardware to manufacturing specifications.

Technical Support

Additional Product Information

  • View Data Sheet