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Left to right visibility of the spot is ensured by __________

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Left to right visibility of the spot is ensured by __________

(a) linear waveform

(b) linear ramp waveform

(c) sinusoidal waveform

(d) unit step waveform

This question was addressed to me in my homework.

The above asked question is from Time Base topic in chapter Oscilloscopes of Electrical Measurements

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Correct option is (c) sinusoidal waveform

For explanation I would say: In the time base generator, a linearly increasing ramp waveform that decreases to zero within a very short time span is used to make sure that the spot is only visible from left to right direction.

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