- 16 analog inputs (16-bit), 1.25 MS/s single-channel (1 MS/s aggregate)
- 2 analog outputs (16-bit, 2.8 MS/s); 24 digital I/O (8 clocked); 32-bit counters
- Use mass termination version with SCC signal conditioning
- NI Signal Streaming for bidirectional high-speed data streams over USB; OEM version available
- Compatible with LabVIEW, LabWindows/CVI, and Measurement Studio for Visual Studio .NET
- NI-DAQmx driver software and NI LabVIEW SignalExpress LE interactive data-logging software
 Data Sheet
The National Instruments USB-6251 is a USB high-speed M Series multifunction data acquisition (DAQ) module optimized for superior accuracy at fast sampling rates. The NI USB-6251 is ideal for applications such as dynamic signal acquisition, and for sensor measurements when used with NI signal conditioning.
The National Instruments USB-6251 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. 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.
This module also features the 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, check the resources tab.
Each module also features an OEM version. Check the resources tab or use the left navigation to get pricing and technical information.
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 data acquisition device includes a copy of NI LabVIEW SignalExpress LE so you can quickly acquire, analyze, and present data without programming. In addition to LabVIEW SignalExpress, M Series data acquisition 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 data acquisition devices are also compatible with Visual Studio .NET, C/C++, and
Visual Basic 6.
Additional Product Information
Related Information
Specifications Documents
Specifications Summary
| General | |
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| Form Factor | USB |
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| OS Support | Windows |
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| Measurement Type | Quadrature encoder, Voltage |
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| DAQ Product Family | M Series |
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| Analog Input | |
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| Number of Channels | 16 SE/8 DI |
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| Sample Rate | 1.25 MS/s |
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| Resolution | 16 bits |
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| Simultaneous Sampling | No |
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| Maximum Voltage Range | -10..10 V |
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| Range Accuracy | 1.92 mV |
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| Range Sensitivity | 112 µV |
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| Minimum Voltage Range | -50..50 mV |
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| Range Accuracy | 0.052 mV |
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| Range Sensitivity | 6 µV |
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| Number of Ranges | 7 |
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| On-Board Memory | 4095 samples |
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| Signal Conditioning | Low-pass filtering |
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| Analog Output | |
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| Number of Channels | 2 |
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| Update Rate | 2.86 MS/s |
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| Resolution | 16 bits |
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| Maximum Voltage Range | -10..10 V |
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| Range Accuracy | 2.08 mV |
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| Minimum Voltage Range | -5..5 V |
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| Range Accuracy | 1.045 mV |
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| Current Drive (Channel/Total) | 5 mA/10 mA |
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| Digital I/O | |
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| Number of Channels | 24 DIO |
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| Timing | Hardware, Software |
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| Maximum Clock Rate | 1 MHz |
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| Logic Levels | TTL |
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| Maximum Input Range | 0..5 V |
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| Maximum Output Range | 0..5 V |
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| Input Current Flow | Sinking, Sourcing |
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| Programmable Input Filters | Yes |
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| Output Current Flow | Sinking, Sourcing |
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| Current Drive (Channel/Total) | 24 mA/448 mA |
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| Watchdog Timer | No |
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| Supports Programmable Power-Up States? | Yes |
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| Supports Handshaking I/O? | No |
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| Supports Pattern I/O? | Yes |
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| Counter/Timers | |
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| Number of Counter/Timers | 2 |
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| Resolution | 32 bits |
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| Maximum Source Frequency | 80 MHz |
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| Logic Levels | TTL |
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| Maximum Range | 0..5 V |
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| Timebase Stability | 50 ppm |
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| GPS Synchronization | No |
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| Pulse Generation | Yes |
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| Buffered Operations | Yes |
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| Debouncing/Glitch Removal | Yes |
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| Timing/Triggering/Synchronization | |
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| Synchronization Bus (RTSI) | No |
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| Triggering | Analog, Digital |
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| Physical Specifications | |
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| Length | 18.8 cm, 26.67 cm |
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| Width | 17.09 cm |
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| Height | 4.45 cm |
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| I/O Connector | 68-pin male SCSI-II type, Screw terminals |
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Extended Warranties
National Instruments designs and manufactures all products to minimize failures, but we know 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.
- 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 bring the hardware back to manufacturing specifications
Calibration
NI recognizes the need to maintain properly calibrated devices for high-accuracy measurements. We provide manual calibration procedures, services to recalibrate your products, and automated calibration software to calibrate many of our measurement products.
Training
NI training is the fastest, most certain route to productivity with NI tools and successful application development.
Repair Services
- You can 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 bring the hardware back to manufacturing specifications.
- Contact us to obtain a Return Material Authorization (RMA) form and shipping instructions
- View your RMA support request status online
- Register your product
Technical Support
www.ni.com/support
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