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The crest factor limit quoted for a true rms multimeter is the largest permissible ratio of

  • A.the highest to the lowest reading obtainable on one range
  • B.the rms value to the rectified mean of the waveform
  • C.the fundamental to the total harmonic content of the input
  • D.peak to root mean square value of the waveform

Answer: D

A very peaky waveform drives the input circuits into clipping long before the rms value reaches full scale, so a limit of three or five is stated. Exceeding it gives a low reading with no warning, which is a trap when measuring the current of a rectifier load.

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