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National Instruments · SCXI

SCXI-1140

The National Instruments SCXI-1140 is an eight-channel differential amplifier module for SCXI systems, providing simultaneous input sampling and connections for external sample-and-hold timing.

ManufacturerNational Instruments

ModelSCXI-1140

Part Number776572-40

Product Type8-channel simultaneous-sampling differential amplifier module

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Input channels8 differential channels

SamplingSimultaneous sample-and-hold

TimingExternal sample-and-hold timing connections

Overvoltage protection±30 V maximum, powered on

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Overview

Product overview

Key product information and technical features.

The SCXI-1140 adds simultaneous sample-and-hold signal conditioning to an SCXI measurement system. NI describes this sampling method as capturing channel values at the same instant, then multiplexing those values for analog-to-digital conversion.

NI documents cascaded configurations with SCXI-1120 or SCXI-1120D isolation amplifiers for simultaneous isolated measurements. Correct module order, cabling, driver support, and DAQ selection are configuration-dependent.

Eight simultaneously sampled differential inputs.
Connections for an external sample-and-hold timing signal.
Maximum ±30 V overvoltage protection while powered on.

Verified specifications

Technical data

Verified product specifications.

Input channel count	8 channels
Input configuration	Differential
Sampling method	Simultaneous sample-and-hold
Maximum overvoltage protection, powered on	±30 V

Condition & included items

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Compatibility

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National Instruments

Manufacturer

SCXI

Signal-conditioning platform

SCXI-1140

Simultaneous-sampling differential amplifier

System timing

NI's multichassis configuration guide gives simultaneous-sampling modules, including the SCXI-1140, priority when selecting the cabled module.

Confirm the complete chassis, DAQ, timing, cabling, and driver configuration before integration.

Manuals & software

Technical resources

Manuals, software and technical resources for this model.

SCXI-1140 Official Product Overview (Spanish)Official Product Page · ni.com

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Cascading SCXI ModulesIntegration Guide · ni.com

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Types of Scanning Supported by NI Acquisition DevicesTechnical resource

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Archived: Configuring a Multichassis SCXI SystemTechnical resource

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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Does simultaneous sampling mean simultaneous conversion?

Not necessarily. NI lists the SCXI-1140 under simultaneous sampling: sample-and-hold circuitry captures channel values together, after which the values are multiplexed and sent to an ADC.

Is ±30 V the specified measurement range?

No. The cited NI overview identifies ±30 V as maximum overvoltage protection while powered on, not as the measurement range.

Can the SCXI-1140 be used after an SCXI-1120D?

NI documents SCXI-1120/D first-stage modules followed by an SCXI-1140 for simultaneous isolation with M-series or E-series DAQ devices. Follow the documented cabling and driver requirements.