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A reading on a digital voltmeter flickers between two values while a nearby motor is running. The measure most likely to help is

  • A.selecting a less sensitive range so that the noise is a smaller fraction
  • B.switching the input coupling to alternating current
  • C.reversing the input leads so that auto-polarity acts
  • D.selecting a longer integrating period

Answer: D

A longer integration averages the interference over more of its cycles and so suppresses it further, at the cost of a slower reading rate. Twisted or screened leads with the guard properly connected would help further still.

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