Discussion
Assertion: the chop mode of a dual trace oscilloscope is used at slow sweep speeds. Reason: the electronic switch cannot operate quickly enough for fast sweeps.
Answer: B
Chop is preferred at slow speeds because alternate mode flickers there, not because the switch is slow. The switch runs at hundreds of kilohertz; at fast sweeps the trouble is that its rate becomes comparable with the signal and the trace breaks into dashes.
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