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An over-compensated oscilloscope probe displays a square wave with

  • A.rounded corners and a slowly rising top to each half cycle
  • B.a reduced amplitude but a correctly shaped waveform
  • C.a sloping top which falls steadily throughout each half cycle
  • D.an overshoot at each edge

Answer: D

Too much capacitance in the probe passes the high frequencies too readily, so the edges are exaggerated and each transition overshoots before settling. Under-compensation gives the opposite, a rounded and slowly rising top.

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