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A Lissajous figure is obtained on an oscilloscope by

  • A.applying one signal to each pair of plates with the time base off
  • B.applying the same signal to both pairs of deflection plates at once
  • C.setting the sweep speed to exactly the period of the signal
  • D.triggering the sweep from an external source of known frequency

Answer: A

With the internal time base disconnected, the horizontal plates carry a second signal and the spot traces the locus of one against the other. The shape of the closed figure reveals the ratio of the two frequencies and their phase relation.

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