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The lag or quadrature adjustment of an energy meter is provided by

  • A.an adjustable air gap between the two poles of the series magnet
  • B.a shading band or copper loop on the shunt magnet
  • C.a permanent magnet whose position along the radius of the disc may be altered
  • D.a small auxiliary winding placed in series with the load current

Answer: B

The shunt magnet flux would otherwise lag the voltage by rather less than ninety degrees because of iron loss and winding resistance. A copper loop or shading band whose position can be shifted brings the lag to the required value, and the adjustment is made at unity power factor and again at 0.5.

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