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The chop mode of a dual trace oscilloscope is preferred at

  • A.frequencies close to the bandwidth limit of the vertical amplifier
  • B.slow sweep speeds
  • C.fast sweep speeds
  • D.any speed

Answer: B

Chopping switches between the channels many times within one sweep, so both appear on every sweep and neither flickers at slow speeds. At fast speeds the chopping rate becomes comparable with the signal and the traces break into visible dashes.

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