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Auto-zeroing in a digital voltmeter is the process of

  • A.adjusting the reference voltage against an internal standard cell
  • B.measuring and subtracting the offset before each reading
  • C.returning the display to zero when the input leads are disconnected
  • D.selecting the range in which the reading sits highest

Answer: B

A phase of each measuring cycle is spent with the input shorted, and the offset then found is subtracted from the reading proper. This removes amplifier drift and thermal offsets continuously, which is why a modern instrument needs no zero control at all.

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