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Comparing the analogue and digital storage oscilloscope for viewing a signal with rare glitches, the analogue instrument

  • A.shows the glitch as clearly as the normal trace
  • B.shows the glitch only if its own bandwidth exceeds that of the glitch tenfold
  • C.shows the glitch faintly on a bright normal trace
  • D.cannot show the glitch at all

Answer: C

The analogue instrument writes every sweep to the phosphor, so an infrequent event appears as a faint trace against the bright envelope, and the relative brightness itself conveys how often it happens. A digital instrument may miss it entirely between acquisitions unless a peak detect mode is used.

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