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Product Background

SCXI (Signal Conditioning eXtensions for Instrumentation) is NI’s legacy signal‑conditioning platform designed to pre‑process real‑world sensor signals before feeding them into DAQ data‑acquisition boards. Many raw field signals carry high‑voltage, common‑mode noise or require isolation, amplification and filtering. The SCXI system separates signal conditioning from measurement hardware: conditioning modules live inside an SCXI chassis, while a terminal block provides field‑wiring access.

The SCXI‑1325 is the dedicated mating terminal block for the SCXI‑1125 and SCXI‑1126 isolated high‑voltage amplifier modules. It is not a signal‑conditioning amplifier itself; it is the field‑wiring interface accessory.

• Designed for high‑voltage isolated measurement scenarios; rated for 250 V channel‑to‑channel and channel‑to‑earth isolation.
• Mechanical specification: standard SCXI module footprint, installs on the front of SCXI‑1125 /‑1126 modules inside an SCXI chassis.
• Status: This is a legacy product, long‑term EOL (End‑of‑Life). New original stock is scarce; market supply consists mainly of used, surplus and refurbished units.

NI SCXI‑1325 High‑Voltage Terminal Block Module

Main Functions

1. Field‑signal wiring interface Provides screw‑terminal connections to route external high‑voltage analog input signals into the SCXI‑1125 / SCXI‑1126 isolation amplifier modules. Engineers connect sensors, transducers and high‑voltage test signals directly to its screw terminals.
2. High‑voltage isolation‑compliant wiring carrier Mechanically and electrically matches the isolation architecture of SCXI‑1125/1126. It maintains module‑level isolation ratings (250 V) between input channels and chassis ground. The front‑panel “HIGH VOLTAGE” marking serves as safety warning for operators.More products: plcva.com
3. Signal routing without signal modification SCXI‑1325 performs no amplification, filtering or A/D conversion. It purely conducts analog signals to the underlying amplifier module, where isolation, gain and filtering are accomplished.
4. Mechanical integration for SCXI chassis Uses standard SCXI mechanical latches. It fastens onto the front of the amplifier module, occupies the front‑panel space of one SCXI slot, and provides strain relief for field wiring inside cabinet‑mounted test systems.
5. Safety mechanical layout Terminal positions follow NI SCXI pin‑out definitions. The physical layout prevents accidental short‑circuit between high‑voltage channels when performing field wiring.

NI SCXI‑1325 High‑Voltage Terminal Block Module

Typical Applications & Use‑Cases

1. High‑voltage analog signal measurement Industrial AC/DC voltage measurement up to 250 V, for power‑supply test, power‑distribution monitoring.
2. Isolated sensor measurement Isolated voltage output transducers, voltage‑type sensors in industrial sites where ground‑loop noise is a major concern. Working together with SCXI‑1125/1126, it eliminates ground‑loop interference.
3. Industrial‑site data‑acquisition systems Factory‑floor signal collection, cabinet‑based test benches, where field signals come from high‑potential equipment.
4. Laboratory and educational measurement systems High‑voltage experimental measurement in university labs and research institutes.
5. Legacy test‑system spare‑part replacement Retrofitting and maintaining existing SCXI‑based ATE systems; replacing damaged terminal blocks without changing the whole signal‑conditioning chain.

NI SCXI‑1325 High‑Voltage Terminal Block Module

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