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The Wagner earthing device is used in a bridge to

  • A.remove the effect of stray capacitance to earth
  • B.protect the operator by holding the whole of the network at earth potential throughout
  • C.provide a low-impedance return path for the harmonic currents in the supply
  • D.earth the detector so that its own capacitance no longer appears across the arms

Answer: A

A pair of impedances in series across the supply is adjusted until their junction is at earth potential, and that junction is then earthed. The stray capacitances of the bridge corners to earth are thereby placed across a branch carrying no detector current, so they drop out.

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