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NI PXIe-1073
NI PXIe-1073

NI PXIe-4340

Product Name:​ PXIe-4340 4-Channel, 24-bit, 25.6 kS/s Simultaneous AC LVDT Input Module
Introduction:​ Dedicated module for AC-excited LVDT/RVDT and inductive displacement sensors with simultaneous sampling.
Technical Specifications:
  • Channels: 4 differential analog inputs
Category:
Description
  • Resolution: 24-bit delta-sigma ADC
  • Sample rate: 1 S/s to 25.6 kS/s simultaneous
  • Input impedance: 200 kΩ differential
  • Excitation: 1–7 Vrms, 400 Hz–10 kHz, per channel
  • Excitation current: up to 30 mA
  • Accuracy: ±0.007% of reading + 0.003% FS (typ)
  • CMRR: 60 dB
  • Open-coil detection: yes
    Structure:​ 3U PXIe module, shielded analog section, separate digital FPGA section.
    Working Principle:​ Generates balanced AC excitation, demodulates returned LVDT secondary via synchronous detection, outputs position ratio.
    Applications:​ Aerospace actuator test, turbine blade displacement, calibration rigs.
    Notes:​ Remote sense leads must drop <10% of Vex; keep excitation frequency stable; self-cal every 24 h for best accuracy.
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