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A triggered time base differs from a free-running one in that it

  • A.sweeps continuously but blanks the beam until the signal arrives
  • B.adjusts its sweep speed automatically to suit the signal applied
  • C.waits for the signal before beginning each sweep
  • D.runs at a frequency locked to a submultiple of the signal frequency

Answer: C

Each sweep is initiated by the signal crossing a chosen level in a chosen direction, so the display is stable without the operator matching frequencies by hand. It also allows a single non-repetitive event to be captured, which a free-running base cannot do.

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