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A digital multimeter measures alternating voltage by

  • A.rectifying it and converting the resulting direct voltage
  • B.counting the zero crossings of the waveform in a fixed interval
  • C.applying it directly to the analogue to digital converter
  • D.integrating it over a whole number of its own periods

Answer: A

The converter works on a steady voltage, so the alternating input must first be turned into one. How faithfully that conversion represents the root mean square value is what distinguishes an average responding instrument from a true rms one.

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