PXIe-4340

The NI PXIe-4340 is a specialized, 4-channel AC LVDT (Linear Variable Differential Transformer) and RVDT (Rotary Variable Differential Transformer) input module from the SC Express family. Engineered for high-accuracy position and displacement measurements, the PXIe-4340 integrates sensor excitation and signal conditioning into a single PXI Express slot. It is the premier solution for engineers requiring deterministic, synchronized data acquisition for structural testing, aerospace flight control validation, and precision industrial metrology.

1. Integrated Signal Conditioning & 24-Bit Resolution

The PXIe-4340 eliminates the need for external signal conditioning by providing integrated AC excitation and filtering. Each of the four channels features a dedicated 24-bit Delta-Sigma ADC, enabling simultaneous sampling at rates up to 25.6 kS/s per channel. This high-resolution architecture ensures that even the most minute displacements are captured with extreme sensitivity and a superior signal-to-noise ratio, making it ideal for detecting micro-level structural deformations.

2. Programmable Excitation & Sensor Versatility

Flexibility is at the core of the PXIe-4340’s design. The module provides programmable excitation voltages ranging from 1 Vrms to 7 Vrms and frequencies from 400 Hz to 10 kHz. This wide operating range ensures compatibility with a broad spectrum of 4-, 5-, and 6-wire LVDT and RVDT sensors. Furthermore, the module supports ratiometric measurements, which automatically compensates for fluctuations in excitation voltage, ensuring long-term measurement stability and accuracy.

3. Advanced Synchronization & System-Level Timing

As a PXI Express module, the PXIe-4340 leverages the advanced timing and synchronization capabilities of the PXIe backplane. Multiple modules can be synchronized with sub-microsecond precision, allowing for massive-scale sensor deployments (e.g., monitoring 100+ displacement points on an aircraft wing). The module also features per-channel isolation to protect the system against ground loops and high-voltage transients, essential for maintaining data integrity in electrically noisy industrial environments.

4. Streamlined Development with NI-DAQmx

The PXIe-4340 is fully supported by the NI-DAQmx driver framework, providing a consistent software experience across all NI data acquisition hardware. Engineers can utilize the LabVIEW environment to rapidly configure virtual channels, implement auto-calibration routines, and scale raw voltage data into engineering units (e.g., millimeters or degrees). This software-centric approach significantly reduces the time required for system validation and deployment.

5. Mission-Critical Application Scenarios

The PXIe-4340 is the industry standard for high-fidelity displacement monitoring in:

• Aerospace Testing: Validating wing flap positions and cockpit control linkages.

• Structural Health Monitoring: Measuring expansion joints and structural shifts in bridges or dams.

• Turbine & Engine Testing: Monitoring valve positions and thermal expansion in power generation equipment.

• Precision Manufacturing: Feedback control for high-accuracy assembly and alignment systems.

Summary

The NI PXIe-4340 represents the pinnacle of LVDT/RVDT measurement technology. By combining integrated excitation, 24-bit simultaneous sampling, and the high-speed synchronization of PXI Express, it provides a robust and scalable platform for the most demanding displacement sensing tasks. Contact our technical team today for professional technical support and competitive project pricing to enhance your precision measurement capabilities.