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Aliasing on a digital storage oscilloscope shows itself as

  • A.a waveform of much lower frequency than the true signal
  • B.a trace that is too faint to be seen at the sweep speed chosen
  • C.an overshoot at every edge of a displayed square wave
  • D.a display whose amplitude is smaller than the true signal

Answer: A

Sampling too slowly makes the samples fall on successive cycles at slowly changing phase, and the reconstructed waveform is a spurious slow beat. It is dangerous because it looks entirely plausible; changing the sweep speed and watching whether the frequency changes reveals it.

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