NI SCXI-1300

NI SCXI-1300

Product Overview
The NI SCXI-1300 is a shielded screw-terminal block designed for connecting field signals to NI SCXI signal conditioning modules. It provides convenient access to analog inputs, outputs, reference pins and chassis ground through screw terminals. The terminal block includes an onboard temperature sensor that supports cold-junction compensation for thermocouple measurements. It is commonly used with SCXI-1100 series modules and other compatible SCXI signal conditioning hardware.

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Description

NI SCXI-1300

Technical Specifications

  • Brand: National Instruments
  • Model: SCXI-1300
  • Product type: Shielded terminal block for SCXI modules
  • Terminal count: 72 screw terminals
  • Signal terminals: 32 pairs for differential inputs
  • Ground terminals: One pair for chassis ground connection
  • Additional terminals: Connections for module OUTPUT, AOREF and SCXIbus guard
  • Wire gauge: 26 AWG to 16 AWG
  • Temperature sensor output: 10 mV/°C
  • Temperature sensor accuracy: ±1.3 °C from 0 °C to 50 °C
  • Temperature sensor repeatability: ±0.5 °C
  • Temperature sensor range: 0 °C to 50 °C
  • Operating temperature: 0 °C to 50 °C
  • Storage temperature: −20 °C to 70 °C
  • Humidity: 10% to 90% RH, non-condensing
  • Usage environment: Indoor use only
  • Compatible modules: SCXI-1100 series and related SCXI signal conditioning modules

Functional Features

  • Provides screw-terminal access for SCXI module signals.
  • Supports 32 differential input connections.
  • Includes onboard temperature sensor for cold-junction compensation.
  • Offers shielded construction to reduce electromagnetic interference.
  • Supports multiplexed temperature sensor and direct temperature sensor modes.
  • Provides chassis ground, output reference and guard connections.
  • Simplifies field wiring for laboratory and industrial test systems.
  • Supports reliable connections for thermocouple and low-level analog signals.

Application Scenarios

  • Thermocouple-based temperature measurement systems.
  • Laboratory data acquisition setups.
  • Industrial process monitoring.
  • Automated test equipment signal interfacing.
  • Sensor calibration and validation systems.
  • Manufacturing quality control test racks.
  • Research and development instrumentation.
  • SCXI-based multi-channel analog input systems.

Performance Parameters

  • 72-position screw-terminal interface.
  • 32 differential input pairs.
  • 10 mV/°C temperature sensor output.
  • ±1.3 °C temperature sensor accuracy from 0 °C to 50 °C.
  • ±0.5 °C repeatability.
  • Shielded terminal block construction.
  • Supports 26 AWG to 16 AWG field wiring.
  • Exact isolation rating, terminal current rating, mechanical dimensions and module-specific compatibility should be confirmed from the official NI SCXI-1300 documentation.

Material Composition

  • Shielded printed circuit board.
  • Screw-terminal blocks.
  • Onboard integrated-circuit temperature sensor.
  • Grounding and shielding structures.
  • Connector interface for SCXI module attachment.
  • Insulating housing and mounting hardware.
  • Labeling for terminal identification.

Structural Features

  • Shielded terminal block design.
  • Two rows of screw terminals for differential signals.
  • Dedicated ground, output and reference terminals.
  • Solder pads for optional circuit additions.
  • Jumper configuration for MTS and DTS temperature sensor modes.
  • Direct mating interface to compatible SCXI modules.
  • Clearly labeled terminal positions.

Working Principle
The SCXI-1300 connects field wiring to an SCXI signal conditioning module through screw terminals. Differential signals are routed to the corresponding module inputs, while ground and reference terminals provide common reference points. The onboard temperature sensor measures terminal block temperature and outputs 10 mV/°C. This voltage can be read by the SCXI module for cold-junction compensation when thermocouples are used. The shielded construction helps reduce noise coupling into sensitive analog signals.

Installation Requirements

  • Attach the terminal block to a compatible SCXI module according to NI instructions.
  • Use wire sizes between 26 AWG and 16 AWG.
  • Tighten screw terminals to the recommended torque.
  • Avoid referencing a thermocouple to ground at more than one point.
  • Keep signal wiring separated from high-voltage and high-current cables.
  • Configure the temperature sensor jumper for MTS or DTS mode as required.
  • Verify that the SCXI module supports the selected terminal block configuration.
  • Ensure the operating environment remains within 0 °C to 50 °C.

Precautions for Use

  • Do not apply voltages beyond the rating of the connected SCXI module.
  • Avoid ground loops when measuring thermocouple signals.
  • Use only one temperature sensor mode at a time.
  • Keep the terminal block clean and free from conductive contamination.
  • Do not force connectors during installation or removal.
  • Verify jumper settings before enabling the temperature sensor.
  • Replace damaged terminal blocks rather than repairing internal circuits.
  • Refer to the official NI SCXI-1300 user manual for wiring diagrams and sensor configuration details.

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