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A sampling oscilloscope builds up a display by taking

  • A.many samples within a single cycle of the waveform
  • B.the average of a large number of complete waveforms
  • C.samples only at the instants when the signal crosses zero
  • D.one sample from each of many successive cycles

Answer: D

Taking one sample per cycle, each a little later than the last, assembles a picture of the waveform at an effective rate far above the real sampling rate. It reaches enormous bandwidths but works only on a strictly repetitive signal.

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