Meters and troubleshootingQuestion 1201 of 1506

How does an LVDT output show which side of centre the core has moved to?

  1. By the frequency of the output voltage
  2. By the DC level of the output voltage
  3. By the size of the excitation current
  4. By the output phase versus the excitation
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Correct answer: By the output phase versus the excitation

The size of the output shows the distance. The phase shows the direction.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 12.6: AC Instrumentation Transducers

Practice meters and troubleshooting

Questions last reviewed: 18 October 2026