NI SCXI-1102

Product Name 32-Channel Thermocouple/Voltage Input Module

Product Introduction The SCXI-1102 is a 32-channel differential analog input signal conditioning module designed for thermocouple, low-bandwidth voltage, millivolt and process current signal measurement. It integrates selectable gain amplifiers and low-pass filters, and supports cold-junction compensation for thermocouple applications.

Category:
Description

Functional Features

  • 32 differential analog input channels plus 1 cold-junction sensor channel
  • Selectable gain of 1 or 100 per channel amplifier
  • 2-pole low-pass filter with 2 Hz cutoff frequency to reject 60 Hz noise
  • Multiplexed input to single output for DAQ device connection
  • Input overvoltage protection up to ±42 V
  • Onboard calibration EEPROM for gain and offset error correction

Technical Specifications

  • Brand: National Instruments
  • Model: SCXI-1102
  • Product Type: Analog Input Signal Conditioning Module
  • Channel Count: 32 differential inputs
  • Gain Options: 1, 100
  • Filter Type: 2-pole low-pass filter, 2 Hz cutoff frequency
  • Overvoltage Protection: ±42 V
  • Temperature Measurement Accuracy: ±0.25 °C at 250 °C
  • Voltage Measurement Accuracy: ±24 mV at 9.5 V
  • Compatible Terminal Blocks: SCXI-1300, SCXI-1303

Application Scenarios

  • Multi-point thermocouple temperature monitoring
  • Industrial process signal acquisition
  • Low-frequency voltage and millivolt signal measurement
  • 4-20 mA process current signal conditioning
  • Structural testing and environmental monitoring systems

Working Principle Each input channel passes through a programmable gain amplifier and a fixed low-pass filter for signal conditioning. The multiplexer routes conditioned signals to a single output channel connected to a DAQ device. The integrated cold-junction sensor provides reference temperature for thermocouple signal conversion.

Installation Requirements

  • Install in standard SCXI chassis slots
  • Connect to compatible terminal blocks for field signal wiring
  • Ensure proper chassis grounding and power supply
  • Configure DAQ software to recognize the module and set channel parameters

Usage Notes

  • Select appropriate gain setting based on input signal range
  • Use matched terminal blocks for thermocouple measurements to ensure compensation accuracy
  • Perform periodic calibration to maintain measurement accuracy
  • Operate within specified temperature and voltage ranges
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