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Auto-ranging in a digital voltmeter selects the range in which

  • A.the integrating period is shortest and the reading therefore quickest
  • B.the display shows an overrange indication rather than a number
  • C.the reading uses as many digits as possible
  • D.the input impedance of the instrument is at its highest

Answer: C

Because the fixed count term of the accuracy specification is a smaller fraction of a larger reading, the most accurate range is the most sensitive one that does not overrange. The instrument steps down until it does overrange and then steps back up.

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