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The chief reason a modern digital multimeter has no zero adjustment on its voltage ranges is that

  • A.the offset of a semiconductor amplifier is inherently negligible
  • B.the dual slope method cannot exhibit an offset at all
  • C.the display is blanked whenever the reading falls below one count
  • D.auto-zeroing corrects the offset during every reading

Answer: D

The instrument measures its own offset with the input shorted in one phase of each cycle and subtracts it, so drift is removed continuously and there is nothing left for the operator to set. An analogue instrument's pointer has no such facility and needs a mechanical zero.

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