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A digital voltmeter reading of 0.000 with the leads open and 0.002 with them shorted on the two volt range indicates

  • A.that the lead resistance is two milliohms
  • B.a small offset of two counts
  • C.a fault in the analogue to digital converter of the instrument
  • D.that the auto-zero circuit is working correctly as designed

Answer: B

Two counts on that range is two millivolts, and it appears only when the input is completed, so it is a thermal or contact offset in the leads rather than in the instrument. It matters when measuring millivolt signals and is dealt with by noting and subtracting it.

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