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A single trace is wanted of a switching transient that occurs once. The instrument to use is

  • A.a sampling oscilloscope
  • B.a dual trace oscilloscope in the chop mode of operation
  • C.an oscilloscope with a long persistence phosphor and a free-running time base
  • D.a digital storage oscilloscope

Answer: D

A sampling oscilloscope needs the waveform to repeat, since it builds the picture from many cycles, and a free-running base would almost certainly be elsewhere when the event happened. Only a storage instrument triggered by the event itself will capture it.

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