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The accuracy of a digital voltmeter is usually specified as a percentage of the reading plus

  • A.a number of counts of the least significant digit
  • B.a percentage of the resolution of the display
  • C.a fixed voltage independent of the range selected
  • D.a percentage of the input impedance of the instrument

Answer: A

The first term is proportional to the reading and comes from gain error; the second is a fixed number of counts and comes from offset and quantisation. Because the second term is fixed, the percentage error grows sharply as the reading falls toward the bottom of a range.

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