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Two digital voltmeters of different makes read 5.001 V and 4.998 V on the same source. The proper conclusion is that

  • A.both readings lie within their combined accuracy limits
  • B.one of the two instruments is certainly faulty and needs repair
  • C.the source itself is unstable and cannot be measured reliably
  • D.the instrument reading higher is the more accurate of the two

Answer: A

Three millivolts on five volts is 0.06 per cent, which is comfortably within the specification of ordinary bench instruments. Deciding which is nearer the truth requires a standard traceable to a national laboratory, not a comparison between the two.

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