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A dual trace oscilloscope differs from a dual beam instrument in that it

  • A.uses two separate cathode ray tubes side by side in one case
  • B.displays the sum of the two signals rather than each separately
  • C.can display only repetitive signals
  • D.uses one beam switched between two signals

Answer: D

An electronic switch shares one gun between the two channels, which is far cheaper than a tube with two guns. The compromise is that neither channel is displayed continuously, so a genuinely simultaneous view of two single events needs a dual beam tube.

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