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The essential operation performed by every digital voltmeter is

  • A.analogue to digital conversion
  • B.amplification of the input to a level the display can accept
  • C.rectification of the input so that a steady quantity may be measured
  • D.comparison of the input with a standard cell of known electromotive force

Answer: A

Whatever the internal method, the instrument must turn a continuous voltage into a number. The differences between the types lie entirely in how that conversion is arranged and in the accuracy, speed and noise immunity each arrangement gives.

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