The Oscilloscope and its Use An oscilloscope shows a steady sinusoidal signal of

Question

The Oscilloscope and its Use An oscilloscope shows a steady sinusoidal signal of 1 Volt peak to peak, which spans 4 cm in vertical direction on the screen. For some reason the time sweep (periodic saw- tooth voltage) of the oscilloscope suddenly fails. What will be observed on the oscilloscope screen? On a 20 MHz oscilloscope as those used in class, the knob of the time sweep rate shows for the fastest setting the mark of 0.2 microseconds per major division in horizontal direction on the screen. How many full periods of a 10 MHz periodic signal will be observed in one major horizontal division?

Explanation / Answer

Saw tooth waves are generally generated as a result from circuits which are designed as the voltage controllers.

Present case periodic saw tooth voltage of oscilloscope suddenly falls. It results in continuous raise in value.This rise will be sinosodial.

2.

Time period= 1/f

= 1/20*10^6

=0.05 micro seconds

No of periods= 0.2/0.05 micro seconds

= 4 periods

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