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A bridge whose balance equations contain no frequency term has the advantage that

  • A.harmonics in the supply waveform no longer prevent a complete null being obtained
  • B.the detector may be a simple moving coil galvanometer instead of a tuned instrument
  • C.the two balance conditions become independent and may be adjusted in either order
  • D.the measurement is unaffected by drift in the supply frequency

Answer: D

Maxwell's inductance bridge and the simple De Sauty bridge are of this kind. Frequency drift then does no harm and the result may be quoted without stating the frequency. Harmonics still trouble the null, however, since the residual arms are not perfectly reactance free.

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