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Normal mode rejection in a digital voltmeter refers to the rejection of interference appearing

  • A.in the reference voltage used by the converter
  • B.in series with the input signal
  • C.equally on both input terminals with respect to earth
  • D.between the case of the instrument and the earth of the supply

Answer: B

Normal mode noise rides on the wanted signal itself, and an integrating instrument rejects it by averaging over a whole number of its cycles. Common mode noise, by contrast, appears on both terminals together and is rejected by the differential input and the guard.

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