NI SCXI-1338

Product Name Current Input High-Voltage Terminal Block

Product Introduction The SCXI-1338 is a shielded current-input terminal block for SCXI analog input modules. It integrates precision current-sense resistors to convert 0–20 mA and 4–20 mA process current signals into voltage signals for measurement by compatible SCXI modules.

Category:
Description

Functional Features

  • 8-channel current-to-voltage conversion
  • Precision 249 Ω resistors per channel (0.1% tolerance, 10 ppm/°C temperature coefficient)
  • Supports 0–20 mA and 4–20 mA industry-standard current loops
  • 18 screw terminals for signal and ground connections
  • 300 VDC channel-to-ground isolation
  • Shielded metal enclosure for interference protection
  • Front-panel mounting on compatible SCXI modules

Technical Specifications

  • Brand: National Instruments
  • Model: SCXI-1338
  • Product Type: Current Input Terminal Block
  • Current Measurement Ranges: 0–20 mA DC, 4–20 mA DC
  • Onboard Resistor: 249 Ω per channel, 0.1% tolerance, 10 ppm/°C tempco, 1/4 W power rating
  • Channel Count: 8 differential input channels
  • Maximum Isolation Voltage: 300 VDC channel-to-ground
  • Terminal Type: Screw terminal
  • Supported Wire Gauge: 26–14 AWG
  • Operating Temperature Range: 0 °C to 55 °C
  • Compatible Modules: SCXI-1120, SCXI-1120D, SCXI-1125, SCXI-1126
  • Compliance: CE, UL 61010-1, CAN/CSA C22.2 No. 61010-1

Application Scenarios

  • Industrial process control current loop measurement
  • 4–20 mA transmitter signal acquisition
  • Process instrumentation signal conditioning
  • Industrial automation system monitoring
  • Factory floor sensor signal interfacing

Working Principle Each channel passes the input current through a precision 249 Ω resistor, converting the current signal to a proportional voltage signal. The voltage signal is then routed to the connected SCXI analog input module for measurement. The isolation barrier protects the DAQ system from high common-mode voltages in industrial field circuits.

Installation Requirements

  • Mount to the front of compatible SCXI analog input modules
  • Connect current loop signals with correct polarity
  • Ensure proper system grounding and isolation
  • Use shielded cable for field wiring to minimize noise

Usage Notes

  • Ensure current signals are within the specified measurement range
  • Verify resistor tolerance meets application accuracy requirements
  • Do not apply voltages exceeding isolation ratings
  • Periodically check terminal connections for reliable current loop operation
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