ET343 · Measuring Precision Displacement: Capacitive and Inductive Cards

Measuring Precision Displacement: Capacitive and Inductive Cards

A comprehensive course package for the ET platform: hands-on exploration of high-precision linear displacement measurement using industrial-standard sensing technologies. This unified module features both the Capacitive Card and the Inductive Card, powered and monitored by the ET300 base system, complete with guided multimedia courseware for the study of non-contact displacement sensors.

Experiments

Capacitive Studies: Measurement of linear displacement using a Linear Variable Capacitor (LVC) and operation of AC bridge circuits
Inductive Studies: Measurement of linear displacement using a Linear Variable Displacement Transformer (LVDT) and operation of primary/secondary coil configurations
Signal Conditioning: Signal amplification, synchronous demodulation, phase-sensitive rectification, and low-pass filtering
Calibration: Calibration of both capacitive and inductive measurement chains to ensure accurate voltage output scaling

ET343 Capacitive and Inductive experiment cards

Description

The Capacitive Card carries a Linear Variable Capacitor (LVC) integrated with a complete signal conditioning chain, allowing students to observe how electrostatic changes are converted into stable DC voltages.
The Inductive Card features a Linear Variable Displacement Transformer (LVDT) alongside its own dedicated demodulation and filtering circuits, demonstrating how core physical movements alter mutual inductance.

Courseware

The interactive multimedia course combines theory with guided experiments: principles of variable capacitance, mutual inductance, AC excitation, and synchronous demodulation. Student answers are evaluated automatically, and the full course—at least 8 hours of directed instruction (4 hours per card)—is available with multi-language support.