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Comparing an integrating digital voltmeter with an oscilloscope for measuring a steady voltage, the voltmeter is better because it

  • A.is unaffected by the frequency of any interference present
  • B.averages the noise and reads to far more figures
  • C.presents a much higher input impedance at every frequency
  • D.responds to the peak rather than the mean of the waveform

Answer: B

An oscilloscope resolves perhaps a fortieth of a division, which is two or three per cent of the screen, while a voltmeter resolves parts in twenty thousand and averages the noise besides. The oscilloscope's advantage lies in showing shape, not magnitude.

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