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In the alternate mode of a dual trace oscilloscope the two channels are displayed

  • A.on successive sweeps
  • B.on alternate halves of each sweep across the screen
  • C.by switching rapidly many times within each single sweep
  • D.one above the other by means of two separate electron beams

Answer: A

Channel one is drawn for a whole sweep, then channel two for the next, and so on. At fast sweep speeds the eye blends them into two steady traces, so the mode suits high frequency work; at slow speeds the traces are seen to flicker alternately.

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