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NI USB-6251 Screw Terminal

Legacy USB DAQ Device

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  • NI recommends the NI USB-6351 X Series DAQ device for all new applications.
  • 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


The NI USB-6251 is a USB high-speed M Series multifunction DAQ device optimized for superior accuracy at fast sampling rates.

It 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 the DAQ Assistant to help reduce development time.

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 the 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 LabVIEW SignalExpress LE so you can quickly acquire, analyze, and present data without programming. In addition to LabVIEW SignalExpress, M Series DAQ devices are compatible with the following versions (or later) of NI application software - LabVIEW 7.1, LabWindows™/CVI 7.x, and Measurement Studio 7.x. M Series DAQ devices are also compatible with Visual Studio .NET, ANSI 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.

Specifications Documents

View Data Sheet

Specifications Summary

General
Product Name USB-6251 Mass Term
Product Family Multifunction Data Acquisition
Form Factor USB
Part Number 779694-07 , 779694-06 , 779694-04 , 779694-03 , 779694-02 , 779694-01
Operating System/Target Windows
DAQ Product Family M Series
Measurement Type Quadrature encoder , Voltage
Isolation Type None
RoHS Compliant Yes
USB Power External-Powered
Analog Input
Channels 16 , 8
Single-Ended Channels 16
Differential Channels 8
Resolution 16 bits
Sample Rate 1.25 MS/s
Max Voltage 10 V
Maximum Voltage Range -10 V - 10 V
Maximum Voltage Range Accuracy 1.92 mV
Maximum Voltage Range Sensitivity 112 µV
Minimum Voltage Range -100 mV - 100 mV
Minimum Voltage Range Accuracy 52 µV
Minimum Voltage Range Sensitivity 6 µV
Number of Ranges 7
Simultaneous Sampling No
On-Board Memory 4095 samples
Analog Output
Channels 2
Resolution 16 bits
Max Voltage 10 V
Maximum Voltage Range -10 V - 10 V
Maximum Voltage Range Accuracy 2.08 mV
Minimum Voltage Range -5 V - 5 V
Minimum Voltage Range Accuracy 1.045 mV
Update Rate 2.86 MS/s
Current Drive Single 5 mA
Current Drive All 10 mA
Digital I/O
Bidirectional Channels 24
Input-Only Channels 0
Output-Only Channels 0
Timing Software , Hardware
Maximum Clock Rate 1 MHz
Logic Levels TTL
Input Current Flow Sinking , Sourcing
Output Current Flow Sinking , Sourcing
Programmable Input Filters Yes
Supports Programmable Power-Up States? Yes
Current Drive Single 24 mA
Current Drive All 448 mA
Watchdog Timer No
Supports Handshaking I/O? No
Supports Pattern I/O? Yes
Maximum Input Range 0 V - 5 V
Maximum Output Range 0 V - 5 V
Counter/Timers
Counters 2
Buffered Operations Yes
Debouncing/Glitch Removal Yes
GPS Synchronization No
Maximum Range 0 V - 5 V
Max Source Frequency 80 MHz
Pulse Generation Yes
Resolution 32 bits
Timebase Stability 50 ppm
Logic Levels TTL
Physical Specifications
Length 26.67 cm
Width 17.09 cm
Height 4.45 cm
I/O Connector Screw terminals
Timing/Triggering/Synchronization
Triggering Digital , Analog
Synchronization Bus (RTSI) No
most popular item most popular item(s)
Part Number Description Est Ship  US Dollars Qty
Device and Professional Accessory Set
779627-01NI USB-6251 M Series, 26 cm, Screw Term US (120V)5 - 10$ 1,799.00
780315-01Rugged Carrying Case for Portable Instrumentation5 - 10$ 175.00
780214-01Externally Powered USB M Series Panel Mounting Kit5 - 10$ 57.00
Optional Accessories
776844-01most popular item SCB-68 Noise Rejecting, Shielded I/O Connector Block1 - 3$ 330.00

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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:

Calibration

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.

Training

NI training is the fastest, most certain route to productivity with NI tools and successful application development.

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

ni.com/support