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Common mode rejection ratio of a digital voltmeter expresses how well it ignores

  • A.interference in series with the wanted signal on one terminal
  • B.changes in the frequency of the supply feeding the instrument
  • C.variations in the ambient temperature of the laboratory
  • D.a voltage common to both input terminals

Answer: D

A large voltage may exist between the low input terminal and earth, for instance when measuring across a shunt in a live circuit. A good differential input responds only to the difference between its terminals and ignores what they share.

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