Product Overview
The National Instruments SCXI-1314 is a shielded terminal block for SCXI strain and bridge signal conditioning modules. It is used with the SCXI-1520 module to provide screw terminal connections for strain gauges, load cells, and other bridge based sensors. The terminal block organizes field wiring and supports shielding and grounding practices for low level measurements.
The SCXI-1314 is part of the NI SCXI signal conditioning platform, which is used in high channel count measurement systems. SCXI modules condition signals close to the sensors, and terminal blocks provide the physical connection point for field wiring. The SCXI-1314 is designed to make strain gauge wiring practical in structural test, fatigue analysis, and mechanical validation systems.
Strain and Bridge Wiring
The terminal block provides screw terminals for connecting bridge sensor leads. Strain gauges may be configured as quarter bridge, half bridge, or full bridge depending on the module settings and the sensor arrangement. Engineers should confirm the wiring configuration and the required completion components for the selected bridge type.
Bridge signals are low level, so lead resistance and noise pickup can affect accuracy. The shielded terminal block helps reduce electromagnetic interference when used with appropriate cable and grounding practice. Consistent lead lengths and careful routing away from power conductors improve measurement quality.
Shielding and Grounding
The SCXI-1314 is designed to support shielded wiring for low level strain measurements. The shield connection and grounding arrangement should follow the module and chassis documentation. Proper grounding helps reject common mode noise and reduces the effect of ground loops in the measurement system.
Engineers should verify the grounding architecture across the sensors, terminal block, module, and chassis. In large structures, different parts of the test article may be at different ground potentials, so isolation and common mode range should be considered. These practices are important for stable strain data.
System Integration
The SCXI-1314 works with the SCXI-1520 module in a compatible SCXI chassis. The module provides excitation, amplification, and filtering for the bridge signals, while the terminal block provides the connection point for field wiring. The combined system is controlled through NI-DAQmx and compatible DAQ hardware.
Engineers should plan the wiring layout so that the terminal block is accessible for installation and maintenance. Cable strain relief and secure connector fastening reduce intermittent faults on vibrating machinery. Documentation of channel assignments and wiring helps during commissioning and troubleshooting.
Installation Considerations
The terminal block should be installed according to the SCXI chassis and module documentation. Engineers should confirm that the terminal block is compatible with the specific SCXI module and chassis in use. Wiring should be inspected for loose strands, damaged insulation, and incorrect polarity before power is applied.
Environmental conditions such as temperature, humidity, and vibration should be considered when the terminal block is used in industrial or field settings. Enclosures and cable management help protect the wiring and maintain measurement reliability over time.
Typical Applications
Strain gauge wiring for SCXI-1520 modules
Load cell and bridge sensor connection
Structural test and fatigue analysis
Mechanical component validation
High channel count SCXI measurement systems
Laboratory and industrial strain measurement
The SCXI-1314 provides a shielded terminal block for SCXI-1520 strain and bridge modules. Its screw terminal connections and shielding support practical wiring for strain gauge and bridge sensor measurements in SCXI systems.
