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A digital storage oscilloscope samples the input and stores the values, which allows it to

  • A.dispense with a vertical amplifier and attenuator altogether
  • B.trigger on a signal without that signal being connected to it
  • C.display events that occurred before the trigger
  • D.display frequencies far above the bandwidth of its own amplifier

Answer: C

Since samples are continuously written into a circular memory, the trigger merely marks a point in the record and the samples already stored can be displayed. Pre-trigger view is impossible on an analogue instrument, where nothing exists until the sweep starts.

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