NI USB-6225 16-Bit, 250 kS/s M Series Multifunction DAQ, External Power

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  • 80 analog inputs (16-bit, 250 kS/s)
  • 2 analog outputs (16-bit, 833 kS/s); 24 digital I/O (8 clocked); 32-bit counters
  • Use mass termination version with SCC signal conditioning
  • NI signal streaming for sustained 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
  • View Data Sheet
  • View Support Resources
The National Instruments USB-6225 is a USB high-performance M Series multifunction data acquisition (DAQ) module optimized for superior accuracy at fast sampling rates. The NI USB-6225 is ideal for applications such as high-channel-count data logging and for sensor measurements when used with NI signal conditioning.

The USB-6225 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 the new NI signal streaming technology, which gives you DMA-like bidirectional high-speed streaming of data across USB. 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 data-logging software, 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.

The mark LabWindows is used under a license from Microsoft Corporation.

Specifications Documents

Specifications Summary

Product Name USB-6225 Mass Term
Product Family Multifunction Data Acquisition
Form Factor USB
Part Number 779974-01 , 779974-02 , 779974-03 , 779974-04 , 779974-06 , 779974-07
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 80 , 40
Single-Ended Channels 80
Differential Channels 40
Resolution 16 bits
Sample Rate 250 kS/s
Max Voltage 10 V
Maximum Voltage Range -10 V - 10 V
Maximum Voltage Range Accuracy 3100 µV
Maximum Voltage Range Sensitivity 97.6 µV
Minimum Voltage Range -200 mV - 200 mV
Minimum Voltage Range Accuracy 112 µV
Minimum Voltage Range Sensitivity 5.2 µV
Number of Ranges 4
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 3230 µV
Update Rate 833 kS/s
Current Drive All 5 mA
Digital I/O
Bidirectional Channels 24
Input-Only Channels 0
Output-Only Channels 0
Timing Software , Hardware
Clocked Lines 8
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
Counters 2
Number of DMA Channels 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 68-pin male SCSI-II type
most popular item most popular item(s)
Part Number Description Est Ship  US Dollars Qty
Device and Professional Accessory Set
779973-01NI USB-6225 M Series Screw Term U.S. (120 V)5 - 10$ 1,828.00
779974-01NI USB-6225 M Series Mass Term U.S. (120V)5 - 10$ 1,828.00
199006-01SH68-68-EPM Shielded Cable, 68 D-Type to 68 D-Type, 1M5 - 10$ 114.00
185262-01Type SH68-68-S, 2 X 68-POS .050 Series D-Type Shielded, 1m12 - 20$ 141.00
780315-01Rugged Carrying Case for Portable Instrumentation5 - 10$ 177.00
780214-01Externally Powered USB M Series Panel Mounting Kit5 - 10$ 58.00
Optional Accessories
779475-01most popular item SCC-68 I/O Connector with 4 SCC Module Slots10 - 15$ 333.00
776844-01most popular item SCB-68 Noise Rejecting, Shielded I/O Connector Block1 - 3$ 333.00

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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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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