NI SCXI-1303

Product Name 32-Channel Isothermal Thermocouple Terminal Block

Product Introduction The SCXI-1303 is a high-accuracy isothermal terminal block designed for thermocouple measurement applications with SCXI-1100 and SCXI-1102/B/C modules. It features isothermal construction and integrated cold-junction sensing to minimize temperature measurement errors.

Category:
Description

Functional Features

  • 32 differential input channels with screw terminals
  • Isothermal copper plane construction to minimize terminal temperature gradients
  • High-accuracy thermistor cold-junction temperature sensor
  • Built-in open-thermocouple detection circuitry
  • Automatic ground referencing for floating (non-grounded) thermocouples
  • 78 total screw terminals for signal, ground and reference connections
  • Pull-up and bias resistors for open thermocouple detection

Technical Specifications

  • Brand: National Instruments
  • Model: SCXI-1303
  • Product Type: Isothermal Thermocouple Terminal Block
  • Compatible Modules: SCXI-1100, SCXI-1102/B/C
  • Channel Count: 32 differential inputs
  • Temperature Sensor Type: Thermistor for cold-junction compensation
  • Sensor Output Range: 1.91 V (at 0 °C) to 0.58 V (at 55 °C)
  • Terminal Type: Screw terminal
  • Supported Wire Gauge: 26–16 AWG
  • Mounting: Front-mounting on compatible SCXI modules

Application Scenarios

  • High-accuracy multi-channel thermocouple temperature measurement
  • Industrial process temperature monitoring and control
  • Thermal testing and validation systems
  • Environmental chamber temperature profiling
  • Research laboratory precision temperature measurement

Working Principle The isothermal copper plane maintains uniform temperature across all thermocouple junctions, eliminating thermal gradient errors. The integrated thermistor measures the reference junction temperature for cold-junction compensation. Built-in circuitry detects broken thermocouples by sensing open-circuit conditions via bias resistors.

Installation Requirements

  • Mount directly to compatible SCXI analog input modules
  • Ensure good thermal contact between the terminal block and module for isothermal performance
  • Connect thermocouple wires with correct polarity
  • Implement proper system grounding for noise rejection

Usage Notes

  • Use with thermocouple-type signals only for optimal performance
  • Allow thermal stabilization after installation before taking high-accuracy measurements
  • Periodically verify cold-junction sensor calibration
  • Tighten terminals evenly to maintain thermal uniformity
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