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National Instruments USB-6251 Screw Terminal Multifunction data acquisition device
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National Instruments · USB

NI USB-6251 Screw Terminal

The NI USB-6251 Screw Terminal is an M Series multifunction USB data acquisition device with integrated screw-terminal connections. It combines 16-bit analog acquisition and generation, 24 digital I/O lines and two 32-bit counters/timers.

ManufacturerNational Instruments
ModelUSB-6251 Screw Terminal
Product TypeMultifunction data acquisition device
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30-Day Warrantystandard coverage
30-Day Returnspolicy applies
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ConnectionsIntegrated screw terminals
Analog inputs16 single-ended or 8 differential; 16-bit
Acquisition speed1.25 MS/s single-channel; 1 MS/s multichannel aggregate
Analog outputs2 channels
Digital I/O24 lines
Counters/timers2 × 32-bit
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Overview

Product overview

Key product information and technical features.

The USB-6251 brings analog I/O, digital I/O, counter/timer functions and digital triggering to a USB-connected measurement system. NI identifies laboratory automation, research, design verification and manufacturing test as applications for this model.

This catalog record identifies the Screw Terminal version. Use its dedicated terminal pinout in the M Series User Manual rather than the BNC or Mass Termination pinouts when planning signal wiring.

  • Screw-terminal access to analog, digital and timing signals.
  • Analog input ranges from ±0.1 V to ±10 V.
  • Two analog outputs for signal generation.
  • Digital triggering and two 32-bit counters/timers.
  • NI-DAQmx driver support for configuration and measurements.
Verified specifications

Technical data

Verified product specifications.

Analog input configuration16 single-ended or 8 differential channels
Analog input resolution16 bit
Maximum single-channel input sample rate1.25 MS/s
Maximum multichannel aggregate input sample rate1.00 MS/s
Analog input ranges±0.1, ±0.2, ±0.5, ±1, ±2, ±5, ±10 V
Analog output channels2 channels
Analog output resolution16 bit
Maximum analog output update rate, one channel2.86 MS/s
Maximum analog output update rate, two channels2.00 per channel MS/s
Digital I/O24 total; 8 Port 0 lines support waveform I/O lines
Counters/timers2, each 32-bit
Host interfaceUSB 2.0 Hi-Speed or full-speed
Condition & included items

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Condition

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Included

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Revision

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Compatibility

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National Instruments

Manufacturer

M Series / USB

DAQ family and host interface

USB-6251 Screw Terminal

Multifunction DAQ device with terminal wiring

Driver

NI-DAQmx

Use the Screw Terminal pinout; BNC and Mass Termination versions have different connection arrangements.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI USB-6251 Product PageProduct Page · ni.com
Open →
NI 6251 Device SpecificationsSpecifications PDF · download.ni.com
Open →
M Series User ManualUser Manual PDF · docs-be.ni.com
Open →
USB-6251 Dimensional DrawingsDimensional Drawings And CAD · ni.com
Open →
62xx DAQ Cable and Accessory Compatibility GuideTechnical resource
Open →
Shipping, warranty & returns

Commercial terms

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Shipping
Free Shipping. Full policy terms apply.
Warranty
30-Day Warranty. Standard coverage applies.
Returns
30-Day Returns. Return policy applies.
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Related products

Alternatives & system components

Related model
NI USB-6251 BNCView product →
Related model
NI USB-6251 Mass TermView product →
Related model
USB-6251 OEMView product →
FAQ

Product-specific questions

Product-specific answers based on available technical information.

Where is the Screw Terminal wiring pinout?

The M Series User Manual includes a dedicated USB-6251 Screw Terminal pinout and default NI-DAQmx counter/timer terminal assignments.

Does 1.25 MS/s apply to multichannel acquisition?

No. The maximum is 1.25 MS/s for one channel and 1.00 MS/s aggregate for multichannel acquisition.

Which driver does the USB-6251 use?

NI identifies NI-DAQmx as the driver for configuration and measurements.

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