PXIe-4331

The NI PXIe-4331 is a high-density, 8-channel simultaneous bridge input module designed for the SC Express family of PXI Express data acquisition (DAQ) hardware. Purpose-built for precision strain, load, and pressure measurements, it integrates sensor excitation and signal conditioning within a single, high-bandwidth PXIe slot. By combining 24-bit resolution with an exceptional sampling rate, the PXIe-4331 provides engineers with the deterministic performance required for advanced structural health monitoring and high-speed material testing.

1. High-Speed Simultaneous Acquisition & 24-Bit Precision

The PXIe-4331 stands out in the SC Express lineup for its ability to deliver 102.4 kS/s per channel simultaneous sampling. Unlike multiplexed modules, the 4331 utilizes a dedicated 24-bit ADC for every channel, ensuring zero inter-channel skew. This high-speed, high-resolution architecture is critical for capturing high-frequency structural vibrations and transient loads in dynamic test environments, providing an industry-leading signal-to-noise ratio.

2. Comprehensive Integrated Signal Conditioning

Designed to simplify complex sensor setups, the PXIe-4331 offers built-in support for multiple bridge configurations:

• Full, Half, and Quarter-Bridge Support: Includes internal bridge completion (120 Ω, 350 Ω, and 1 kΩ options) to reduce external wiring complexity.

• Programmable Excitation: Provides independent, per-channel programmable excitation voltages from 0.625 V to 10 V, ensuring optimal performance for a wide variety of strain gauges and load cells.

• Remote Sensing: Compensates for lead-wire resistance, ensuring that the target excitation voltage reaches the sensor precisely even over long cable runs.

3. Hardware-Level Accuracy: Shunt Calibration and TEDS

To ensure long-term data integrity and NIST-traceable accuracy, the PXIe-4331 features sophisticated calibration tools:

• Internal Shunt Calibration: Enables engineers to verify the bridge gain and software scaling by simulating a mechanical load across the bridge, critical for pre-test validation in the field.

• TEDS (Transducer Electronic Data Sheet) Support: Automatically reads sensor-specific scaling factors and calibration data from smart sensors, virtually eliminating manual configuration errors and accelerating system setup times.

4. Advanced Filtering and Anti-Aliasing

Each channel of the PXIe-4331 incorporates digital anti-aliasing filters that automatically adjust their cutoff frequency based on the selected sampling rate. This hardware-integrated filtering ensures that high-frequency noise does not contaminate the measurement band, providing “clean” data directly to the host CPU for real-time analysis.

5. Seamless PXI Express Integration & NI-DAQmx

As a native PXI Express module, the PXIe-4331 leverages the high-speed backplane for sub-microsecond synchronization between multiple modules. Managed by the NI-DAQmx driver, it allows for rapid development in LabVIEW or C++. Engineers can easily scale hundreds of channels for massive structural tests while maintaining perfect phase alignment across the entire system.

6. Target Application Scenarios

The PXIe-4331 is the standard for high-fidelity mechanical testing, including:

• Aerospace Structural Testing: High-speed wing loading and fatigue analysis.

• Automotive Crash & Impact Testing: Monitoring multi-axial load cells during high-g events.

• Civil Infrastructure Monitoring: Dynamic strain measurement on bridges and wind turbine blades.

• Material Characterization: High-speed tensile and compression testing in laboratory R&D.

Summary

The NI PXIe-4331 is a robust, all-in-one solution for engineers who refuse to compromise on speed or accuracy. By integrating 24-bit ADCs, high-speed sampling, and flexible bridge completion into the PXI Express architecture, it provides a scalable and reliable foundation for any high-bandwidth mechanical measurement system. Contact our engineering team today for professional technical support and competitive project pricing to power your mission-critical testing.