Description

The National Instruments SCXI-1520 is a universal strain gauge measurement module designed for high-accuracy structural testing and transducer interfacing in demanding environments. As a cornerstone of NI’s SCXI platform, this 8-channel module delivers 24-bit resolution with simultaneous sampling at 50 kS/s per channel, supporting full/half/quarter-bridge configurations, voltage inputs, and IEPE sensors. The SCXI-1520 integrates programmable excitation (0–10V, 0–20mA), shunt calibration, and advanced noise rejection (120 dB CMRR) to achieve microstrain (µε) resolution for stress analysis and load monitoring. Its channel-to-channel isolation (250 Vrms) eliminates ground loops while TEDS (IEEE 1451.4) support automates sensor configuration. Engineered for seamless integration with NI DAQ systems and LabVIEW, the SCXI-1520 sets the benchmark for reliability in aerospace structural validation, automotive durability testing, and industrial transducer calibration.

NI SCXI-1520

Technical Specifications

Main Features and Advantages

Universal Sensor Interface: Single-module support for strain gauges (all bridge types), voltage inputs (±10V), and IEPE accelerometers eliminates setup changes during complex tests like engine block strain mapping.
Intelligent Excitation Management: Per-channel programmable excitation with <10> Metrology-Grade Calibration: Integrated shunt calibration resistors (0.1% tolerance) enable in-situ verification without disconnecting sensors. 24-bit ADC resolves 0.1 µε changes in composite material testing.
Dynamic Signal Optimization: Hardware filters (10 Hz–20 kHz) suppress aliasing during impact testing. IEPE constant-current (4 mA) sourcing powers accelerometers directly.
TEDS Workflow Efficiency: Auto-configures gauge factor, bridge type, and calibration data from TEDS sensors, reducing setup errors in multi-channel structural health monitoring systems.

Application Field

The SCXI-1520 excels in precision mechanical measurement:

Aerospace: Wing fatigue testing with 500+ channel airframe strain monitoring at 50 kS/s.

Automotive: Real-time torque measurement on drivetrain dynamometers and EV battery enclosure stress analysis.

Civil Engineering: Bridge cable tension monitoring and seismic sensor networks with long-term drift <1>

Industrial: Load cell calibration for crane safety systems and pressure vessel integrity validation.

Research: Material creep studies and wind turbine blade modal analysis using IEPE vibration sensors.

Related Products

SCXI-1314: Terminal block with bridge completion for SCXI-1520.

SCXI-1127: Current/IEPE module for complementary measurements.

NI 9237: C Series IEPE module (PXI alternative).

SCXI-1141: 8-channel filter module for anti-aliasing.

NI 9944: Quarter-bridge completion accessory kit.

PCI-6133: Simultaneous sampling DAQ card (500 kS/s).

SCXI-1001: 12-slot chassis for large-scale systems.

NI SCXI-1520

Installation and Maintenance

Pre-installation preparation: Verify strain gauge compatibility (120–350Ω). Use 4-wire connections for quarter-bridge setups to compensate lead resistance. Disable excitation before wiring to prevent bridge damage. Ground chassis to <1> Maintenance recommendations: Perform shunt calibration monthly via NI-DAQmx. Annually verify excitation voltage with calibrated DMM. Clean terminal blocks with isopropyl alcohol every 6 months. Replace aging strain gauges after 10⁶ load cycles to maintain accuracy.