NI SCXI-1125

Product Name 8-Channel High-Precision Isolated Analog Input Module

Product Introduction The SCXI-1125 is a high-performance isolated analog input module for precision voltage signal measurement. It provides 12 selectable gain settings, wide input range and channel-to-channel isolation, making it suitable for demanding industrial and test measurement applications.

Category:
Description

Functional Features

  • 8 differential / 16 single-ended input channels
  • 12 gain settings ranging from 1 to 2000
  • Input voltage range up to ±5 V (extendable to 1000 V with external attenuators)
  • Channel-to-channel isolation for common-mode noise rejection
  • 10 kHz bandwidth for fast signal capture
  • Overvoltage protection up to ±300 V on isolated pins
  • 16-bit resolution for high-accuracy measurement

Technical Specifications

  • Brand: National Instruments
  • Model: SCXI-1125
  • Product Type: Isolated Analog Input Module
  • Resolution: 16-bit
  • Sampling Rate: Up to 100 kS/s per module
  • Input Range: ±10 V (nominal), extendable via external terminal blocks
  • Gain Range: 1 to 2000
  • Operating Temperature Range: -40 °C to +85 °C
  • Isolation Voltage: 300 Vrms Category II working isolation
  • Compatible Terminal Blocks: TBX-1316, SCXI-1327

Application Scenarios

  • Automotive and aerospace component testing
  • Power grid and energy facility monitoring
  • Industrial machine condition monitoring
  • Vibration analysis and predictive maintenance
  • Scientific research and laboratory measurement experiments
  • High-voltage signal measurement with attenuation accessories

Working Principle Input signals pass through isolated amplification stages with programmable gain, then are filtered and multiplexed to the module output. The isolation barrier eliminates ground loops and common-mode interference, ensuring accurate measurement of low-level signals in noisy industrial environments.

Installation Requirements

  • Install in SCXI chassis with compatible slot configuration
  • Pair with appropriate terminal blocks based on signal voltage level
  • Ensure proper isolation between high-voltage and low-voltage circuits
  • Connect DAQ device via SCXIbus or direct parallel cable

Usage Notes

  • Use external attenuator terminal blocks for voltages exceeding the native input range
  • Verify isolation ratings before applying high-voltage signals
  • Perform calibration at regular intervals to maintain accuracy
  • Follow high-voltage safety procedures when wiring and operating
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