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Capacitive transducers are troubled particularly by

  • A.the wear of the moving plate against its guides
  • B.self-heating produced by the current through the dielectric
  • C.the temperature coefficient of the resistance of the plates
  • D.stray capacitance of the leads and surroundings

Answer: D

The capacitance being measured may be a few picofarads while the leads contribute tens, so screening and guarding are essential and the electronics is often built into the transducer housing. A moving hand nearby can otherwise change the reading.

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