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The trigger level control of an oscilloscope sets

  • A.the vertical position at which the trace appears on the screen
  • B.the amplitude below which the signal is not displayed at all
  • C.the speed at which the spot travels across the screen
  • D.the voltage at which the sweep is started

Answer: D

The sweep begins when the input crosses that voltage, so moving the control moves the starting point along the waveform and shifts the displayed pattern horizontally. Setting it outside the signal range means no trigger and no display at all.

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