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The output of an LVDT at the null position is

  • A.half of the full-scale output of the device
  • B.equal to the primary voltage divided by the turns ratio
  • C.nearly zero, the two secondary voltages cancelling
  • D.at its maximum, the core being centrally placed within both coils

Answer: C

With the core central the coupling to each secondary is equal and their opposed voltages cancel, so the null is a genuine electrical zero. A small residual voltage remains from imperfect symmetry and stray capacitance, and it is the limit on the device's resolution.

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