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In the automatic trigger mode an oscilloscope

  • A.chooses the sweep speed to display exactly two cycles of the signal
  • B.sweeps anyway if no trigger arrives
  • C.sets the trigger level automatically to the mean value of the signal
  • D.selects the trigger slope according to the polarity of the input

Answer: B

A timer starts a sweep if nothing has triggered for a while, so a baseline is always visible and the operator is not left with a blank screen while hunting for the level. Normal mode shows nothing until a genuine trigger occurs.

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