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What is done to make the trace horizontal?

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What is done to make the trace horizontal?

(a) negative voltage is applied

(b) positive voltage is applied

(c) no voltage is applied

(d) voltage is synchronised

This question was posed to me during an interview for a job.

This is a very interesting question from Basic Principle of Signal Display topic in portion Oscilloscopes of Electrical Measurements

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Right choice is (d) voltage is synchronised

Explanation: The trace is made stationary by synchronising the sawtooth voltage with the magnitude of the signal that is applied to the vertical input.

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