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Which type of digital voltmeter gives the best rejection of noise on the input?

  • A.the linear ramp type
  • B.the staircase ramp type
  • C.the dual slope integrating type
  • D.the successive approximation type

Answer: C

Integration averages the noise over the measuring period, and choosing that period as a whole number of mains cycles cancels supply frequency interference outright. Every sampling method takes the input as it finds it, noise included.

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