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An averaging clamp meter used on a distorted current typically reads

  • A.high, sometimes by tens of per cent
  • B.correctly, the distortion averaging out over a cycle
  • C.correctly, provided the frequency is the supply frequency
  • D.low, sometimes by tens of per cent

Answer: D

Its scaling assumes the rectified mean of a sinusoid, and a waveform with narrow tall peaks has a much smaller mean for the same rms value. Believing such a reading understates the load and hides the very inefficiency being looked for.

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