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A delay line is included in the vertical channel of an oscilloscope so that

  • A.the sweep can be triggered from the trailing edge of a pulse
  • B.the vertical amplifier has time to recover between sweeps
  • C.the leading edge of the triggering event can be seen
  • D.the signal arrives at the plates in step with the sawtooth voltage

Answer: C

The trigger circuit and the sweep generator take a little time to start, so without a delay the first part of the very edge that triggered the sweep would already have passed. Delaying the signal by rather more than that lets the edge itself be displayed.

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