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National Instruments USB-6251 Mass Term Multifunction data acquisition device
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National Instruments · USB

NI USB-6251 Mass Term

The NI USB-6251 Mass Term is an M Series multifunction USB DAQ device combining analog input, analog output, digital I/O and counters. This variant routes signals through a 68-pin mass-termination connector.

ManufacturerNational Instruments
ModelUSB-6251 Mass Term
Product TypeMultifunction data acquisition device
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30-Day Warrantystandard coverage
30-Day Returnspolicy applies
Technical Supportmodel & compatibility help
Analog inputs16 channels, 16-bit resolution
Maximum AI sampling1.25 MS/s single channel; 1.00 MS/s multichannel aggregate
Analog outputs2 channels, 16-bit resolution
Digital I/O24 lines
Counters/timers2 counters, 32-bit resolution
Signal connection68-pin SCSI mass termination
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Overview

Product overview

Key product information and technical features.

The USB-6251 combines voltage acquisition, analog output, digital I/O and counter/timer functions in a USB-connected M Series device. NI identifies laboratory automation, research, design verification and manufacturing test as applications.

Mass termination distinguishes this version from the USB-6251 BNC and screw-terminal variants. Signal wiring uses an external cable and accessory rather than direct onboard terminals; select connectivity using NI's 62xx cable and accessory guide.

  • 16-bit analog acquisition with up to 1.25 MS/s single-channel sampling.
  • Two analog outputs with maximum updates of 2.86 MS/s for one channel or 2.00 MS/s per channel with two channels.
  • 24 digital I/O lines, with waveform functionality on the eight Port 0 lines.
  • Two 32-bit counters/timers and digital triggering.
Verified specifications

Technical data

Verified product specifications.

Analog input channels16 channels
Analog input resolution16 bits
Maximum single-channel AI sample rate1.25 MS/s
Maximum multichannel AI aggregate sample rate1.00 MS/s
Analog output channels2 channels
Analog output resolution16 bits
Maximum AO update rate, one channel2.86 MS/s
Maximum AO update rate, two channels2.00 per channel MS/s
Digital I/O24 total; 8 Port 0 waveform-capable lines lines
Counters/timers2, each with 32-bit resolution
Signal connector68-pin SCSI 0.050 D-Type
Condition & included items

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Condition

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Included

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Compatibility

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National Instruments

Manufacturer

M Series / USB

DAQ family and host interface

USB-6251 Mass Term

Multifunction DAQ with external signal connectivity

Driver family

NI-DAQmx

Use the mass-termination pinout and connector-specific accessory guide; BNC and screw-terminal variants use different signal connections.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

USB-6251 Product OverviewManufacturer Product Page · ni.com
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M Series User Manual — USB-6251 Mass Termination PinoutUser Manual · docs-be.ni.com
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62xx Multifunction I/O Cable and Accessory CompatibilityAccessory Guide · ni.com
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USB-6251 Dimensional DrawingsDimensional Drawings · ni.com
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NI 625x Family Specifications in USB M Series Data SheetTechnical resource
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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 Screw TerminalView product →
Related model
NI USB-6259 Mass TermView product →
FAQ

Product-specific questions

Product-specific answers based on available technical information.

What does Mass Term mean on the USB-6251?

It identifies the mass-termination variant, which uses a 68-pin signal connector and external cabling rather than direct BNC or screw-terminal signal connections.

Can both analog outputs update at 2.86 MS/s?

No. The specified maximum is 2.86 MS/s for one output channel and 2.00 MS/s per channel when using two output channels.

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