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True or false: auto-zeroing removes the need for the operator to short the leads before a reading.

  • A.True, each cycle measures and subtracts the offset
  • B.False, the leads still having to be shorted at the start of each session
  • C.False, auto-zeroing acting only on the alternating voltage ranges
  • D.True, but only on the most sensitive range of the instrument

Answer: A

A phase of every measuring cycle is spent measuring the instrument's own offset with the input shorted internally, and that offset is subtracted. Drift is therefore corrected continuously and no manual zeroing is possible or necessary.

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