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A digital voltmeter's reference is derived from

  • A.a temperature-compensated zener or band-gap element
  • B.the mains supply
  • C.the integrating capacitor
  • D.the clock oscillator

Answer: A

The reference is the one component whose value the reading depends on directly, so it is made as stable as possible against temperature and time. Its drift is the largest single contributor to the gain error term of the accuracy specification.

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