Description

The NI SCXI-1327 is a 16-channel,single-pole single-throw(SPST)electromechanical relay module designed for the National Instruments SCXI(Signal Conditioning eXtensions for Instrumentation)modular data acquisition platform.Capable of switching signals up to 300 V DC/AC(rms)and 2 A per channel,it enables flexible signal routing,load switching,and device-under-test(DUT)control in automated test,validation,and research environments.With 500 V channel-to-channel isolation,low thermal EMF(<2µV),and compatibility with LabVIEW,DAQmx,and SCXI chassis controllers,the SCXI-1327 serves as a robust,programmable switching backbone in aerospace,power electronics,automotive,and semiconductor test systems.

Application Scenarios

At an electric vehicle(EV)inverter manufacturer in Michigan,engineers needed to automate endurance testing of 400 V DC bus capacitors under rapid charge/discharge cycles.Using a bank of NI SCXI-1327 modules controlled by a PXI system running LabVIEW,they created a programmable matrix that connected each capacitor to a high-current source,then to a dump resistor—switching sequences at 1 Hz for 10,000 cycles.The SCXI-1327’s 300 V rating(with derating margin)and reliable electromechanical contacts handled the arcing without degradation.Over 18 months,the system tested 12,000+units with zero relay failures,reducing manual labor by 90%and accelerating time-to-market.The SCXI-1327 thus became the silent workhorse behind scalable,high-voltage validation.

Parameter

Main Parameters Value/Description

Product Model SCXI-1327

Manufacturer National Instruments(now part of Emerson Electric as”NI”)

Product Category 16-Channel Electromechanical Relay Switch Module(SCXI Platform)

Compatible Systems SCXI-1000,SCXI-1100,SCXI-1102,SCXI-1122 chassis;controlled via DAQ devices(e.g.,PCI-6251,PXI-6259)

Relay Type Electromechanical,SPST(Form A–normally open)

Number of Channels 16 independent relays

Maximum Switching Voltage 300 V DC or 300 V AC(rms)

Maximum Switching Current 2 A(resistive load)

Carry Current(Continuous)1 A per channel

Contact Resistance<100 mΩ(typical)

Thermal EMF<2µV(ideal for precision DC measurements)

Isolation 500 V between channels and to chassis ground

Actuation Time~5 ms(typical operate/release)

Mechanical Life>10⁷operations

Electrical Life(at full load)>10⁵operations

Front Connector 37-pin D-Sub(female);compatible with SHC68-37 cables

Control Interface Digital I/O lines from SCXI controller module(e.g.,SCXI-1122)

Daisy-Chain Support Yes–multiple SCXI-1327 modules can be controlled via one digital port

LED Indicators One per channel(illuminates when relay is energized)

Operating Temperature 0°C to+50°C

Certifications CE,UL,cUL,RoHS

Note:The SCXI-1327 requires an SCXI chassis and a compatible DAQ controller.It does not provide signal conditioning—only switching.

Technical Principles and Innovative Values

Innovation Point 1:Low Thermal EMF for Metrology-Grade Switching

Unlike reed or solid-state relays,the SCXI-1327 uses copper-alloy contacts with minimal thermoelectric offset—critical when switchingµV-level sensor signals in calibration labs.

Innovation Point 2:Daisy-Chain Architecture for Scalable I/O

A single 16-bit digital port can control up to eight SCXI-1327 modules(128 relays)via serial addressing—dramatically reducing DAQ channel consumption.

Innovation Point 3:True High-Voltage Isolation in Compact Form Factor

Despite its 1-slot SCXI width,the module achieves 500 V isolation through careful PCB layout and creepage/clearance design—enabling safe mixed-signal test beds.

Innovation Point 4:Seamless Software Integration via DAQmx

In LabVIEW or Python(nidaqmx),users switch relays with simple commands like WriteDigitalLines()—no low-level register programming required.

Application Cases and Industry Value

In a satellite component test facility in France,the SCXI-1327 routes solar array simulator outputs to different power regulation units during qualification campaigns.Its reliability over 5+years of daily cycling eliminated contact welding issues seen with cheaper relays.Meanwhile,in a university plasma physics lab,researchers use it to sequence high-voltage bias supplies across diagnostic probes—with the low thermal EMF ensuring accurate Langmuir probe I-V curves.These deployments prove the SCXI-1327 remains indispensable in applications where precision,isolation,and longevity outweigh the trend toward solid-state switching.

Related Product Combination Solutions

NI SCXI-1122:Digital I/O controller module that drives SCXI-1327 relays

NI SCXI-1000/1100:1-slot or multi-slot SCXI chassis housing the SCXI-1327

NI PCI-6251/PXIe-6341:DAQ boards providing digital control signals to SCXI chassis

NI LabVIEW/DAQmx:Software stack for programming relay sequences and integrating with measurements

NI TB-2706:Terminal block accessory for screw-terminal field wiring to SCXI-1327

Keysight or Tektronix SMUs:Source-measure units often switched via SCXI-1327 in semiconductor test

Custom Shielded Cables(SHC68-37):Ensure noise-free relay control in EMI-heavy environments

NI VeriStand:Real-time test automation platform that can incorporate SCXI-1327 switching logic

Installation,Maintenance,and Full-Cycle Support

Installation involves inserting the SCXI-1327 into an SCXI chassis slot,connecting the 37-pin D-Sub to a terminal block or custom fixture,and linking its control lines to an SCXI digital I/O module(e.g.,SCXI-1122).Configuration is performed in software—no jumpers or DIP switches.

Maintenance best practices include:

Monitoring relay cycle counters in test software to predict end-of-life

Periodic inspection of contact resistance using a milliohmmeter during calibration

Avoiding inductive loads without flyback diodes to prevent contact arcing

Every NI SCXI-1327 we supply is fully validated:

✅All 16 relays tested for continuity,isolation,and switching at 300 V/1 A

✅LED indicators verified per channel

✅D-Sub pinout continuity confirmed

✅Firmware/hardware revision matched to legacy system requirements

We offer a 24-month warranty,access to original NI manuals and driver support files,and lifecycle management guidance—even as NI transitions focus to newer platforms like CompactDAQ and PXI.For organizations maintaining mission-critical SCXI-based test systems,we ensure continued access to trusted,high-performance switching.

Contact us for a customized solution—because in test and measurement,how you connect your signals is just as important as what you measure.

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