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Harmonics in the bridge supply are troublesome because

  • A.they raise the temperature of the bridge arms and so alter the values being compared
  • B.they cause the detector to indicate a balance where in fact none has been reached
  • C.the source impedance rises with frequency and starves the network of current
  • D.balance holds only at the fundamental

Answer: D

The balance condition depends on the reactances, which vary with frequency, so a network balanced at the fundamental is not balanced for the harmonics. The residual harmonic voltage keeps the detector from going fully silent, which is why a tuned detector or a filtered source is used.

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