NI SCXI-1327

Product Name High-Voltage Attenuator Terminal Block

Product Introduction The SCXI-1327 is a shielded high-voltage attenuator terminal block for SCXI analog input modules. It integrates precision 100:1 resistive voltage dividers to extend the input voltage range of compatible modules up to 300 Vrms or ±300 VDC.

Category:
Description

Functional Features

  • Precision 100:1 resistive voltage divider per channel
  • Extends input voltage range to 300 Vrms or ±300 VDC
  • Individually bypassable dividers for low-voltage measurement
  • 18 screw terminals for signal and ground connections
  • Built-in thermistor for cold-junction compensation
  • Shielded metal enclosure for noise reduction
  • Front-mounting design for compatible SCXI modules

Technical Specifications

  • Brand: National Instruments
  • Model: SCXI-1327
  • Product Type: High-Voltage Attenuator Terminal Block
  • Attenuation Ratio: 100:1 (fixed, bypassable)
  • Maximum Input Voltage: 300 Vrms, ±300 VDC
  • Temperature Sensor Type: Thermistor for cold-junction compensation
  • Sensor Output Range: 1.91 V (0 °C) to 0.58 V (55 °C)
  • Terminal Type: Screw terminal
  • Supported Wire Gauge: 26–14 AWG
  • Compatible Modules: SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, SCXI-1126

Application Scenarios

  • High-voltage power signal measurement
  • Industrial motor drive and inverter monitoring
  • Power distribution system voltage sensing
  • High-voltage battery testing
  • Industrial power quality analysis

Working Principle Each channel uses a precision resistive voltage divider to reduce high input voltages to levels compatible with SCXI analog input modules. The divider can be bypassed via configuration for low-voltage signals. The integrated thermistor provides temperature reference for cold-junction compensation when used with thermocouple signals.

Installation Requirements

  • Mount to the front of compatible SCXI analog input modules
  • Ensure proper high-voltage insulation and clearances
  • Connect safety ground before applying high voltages
  • Use appropriately rated wire for high-voltage circuits

Usage Notes

  • Strictly observe maximum voltage ratings to prevent electric shock and equipment damage
  • Verify divider bypass configuration before applying signals
  • Perform periodic insulation resistance testing
  • Follow all high-voltage safety procedures during wiring, operation and maintenance
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