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National Instruments · SCXI

SCXI-1521

Name: SCXI-1521
Brand: National Instruments

The National Instruments SCXI-1521 is a 24-channel strain/bridge input module for 350 Ω quarter-bridge strain gauges. It provides software-selectable voltage excitation, lowpass filtering, and 350 Ω bridge-completion resistors.

ManufacturerNational Instruments

ModelSCXI-1521

Part Number777966-21

Product TypeQuarter-bridge strain/bridge input module

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Input channels24

Gauge configuration350 Ω quarter bridge

ExcitationSoftware-selectable voltage

Required terminal blockSCXI-1317

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Overview

Product overview

Key product information and technical features.

The SCXI-1521 provides high-channel-count quarter-bridge strain measurement for static and fatigue structural testing using 350 Ω gauges.

Sensor wiring connects through the SCXI-1317 terminal block. Installation requires an SCXI or PXI/SCXI combination chassis, with cabling and a cable adapter selected for the application.

24 quarter-bridge strain input channels.
350 Ω bridge-completion resistors for matching quarter-bridge gauges.
Software-selectable voltage excitation and lowpass filtering.
SCXI-1317 connection guidance covers both two-wire and three-wire quarter-bridge strain gauges.

Verified specifications

Technical data

Verified product specifications.

Input channel count	24 channels
Bridge configuration	Quarter bridge
Nominal strain-gauge resistance	350 Ω
Bridge-completion resistance	350 Ω
Excitation type	Software-selectable voltage
Filter type	Lowpass
Required front-mount terminal block	SCXI-1317

Condition & included items

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National Instruments

Manufacturer

SCXI

Modular signal-conditioning platform

SCXI-1521

350 Ω quarter-bridge strain input module

Sensor connection

SCXI-1317 front-mount terminal block

Confirm the module suffix before selecting gauges: SCXI-1521 uses 350 Ω gauges; SCXI-1521B uses 120 Ω gauges.

Manuals & software

Technical resources

Manuals, software and technical resources for this model.

SCXI-1521 Official Product PageProduct Page · ni.com

Open →

SCXI-1317 Terminal Block Installation Guide and SpecificationsInstallation Guide · download.ni.com

Open →

NI-DAQmx 17.5 ReadmeDriver Support Reference · ni.com

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SCXI-1317 Two-Wire and Three-Wire Quarter-Bridge Wiring GuideTechnical resource

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FAQ

Product-specific questions

Product-specific answers based on available technical information.

What is the difference between SCXI-1521 and SCXI-1521B?

The SCXI-1521 is intended for 350 Ω quarter-bridge gauges and has 350 Ω completion resistors. The SCXI-1521B is the 120 Ω quarter-bridge version. They should not be treated as the same model.

Which terminal block does the SCXI-1521 require?

NI specifies the SCXI-1317 front-mount terminal block. Its installation guide includes two-wire and three-wire quarter-bridge wiring diagrams.

Does NI-DAQmx support the SCXI-1521?

The NI-DAQmx 17.5 readme explicitly lists NI SCXI-1521/B among supported modules. This is version-specific evidence, not a statement of compatibility with every driver release or operating system.