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True or false: a piezoelectric transducer can weigh a stationary object.

  • A.False, leakage drains the charge within seconds
  • B.True, provided a charge amplifier of high input resistance is used
  • C.True, since the charge generated is proportional to the force applied
  • D.True, but only if the crystal is kept at a constant temperature

Answer: A

The charge generated does correspond to the force, but leakage through the crystal and the amplifier drains it away within seconds. A strain gauge load cell is the transducer for static weighing; the crystal is for shock and vibration.

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