Question

Oscilloscope time base problem. You are asked to display a 1 kHzsine wave signal on the screen. Since the period T is related tothe frequency f by the formula T = 1 / f, the period of this waveis 1/(103/s)=1ms, so a reasonable setting for the"Time/div" dial is 1 ms/div. But suppose you select aninappropriate setting for the Time/div dial by mistake. What wouldyou see if you set the dial on 1 μ s/div?100 ms/div?A. Asine wave shifted to the left on 1 μ s/div and to the right on100 ms/divB. A(nearly) horizontal line on 1 μ s/div andmany (nearly) vertical lines of 100 ms/divC.Nothing on either (no trigger)D. Anormal sine wave in both casesE.None of these

Answer 1

Answer:

B.

Explanation:

If we need to show on the screen a sine wave of 1 Khz, this means that the period (time to complete one cycle), will be 1/f = 1 ms.

So, in order to show some cycles on the screen at the same time, it is reasonable to choose a 1ms/div setting for "Time/div" dial.

If we by mistake choose a much much shorter setting (like 1 μs/div), what we will look at the screen will be very different, as we will be looking at 1/1000 of a cycle per div, so we wil see a nearly horizontal line.

If instead we choose 100 ms/div, this means that each division  will show 100 cycles of the sine wave, that they will look at if they were a lot of nearly vertical lines very closely spaced.

So, the statement B). is the one that is true.

Answer 2

What would be seen if the dail is set on 1μ s/div is : ( B ) A (nearly) horizontal line on 1 μ s/div and many (nearly) vertical lines of 100 ms/div

Time required

From the question the time required to complete one cycle ( T ) is 1/f = 1 ms. therefore to display some cycles on the screen at the same time we will choose 1 ms/div as the default setting for the "Time/div" dial. But

If we choose 100 ms/div the division on the screen will show 100 cycles of sine wave which will look like closely packed vertical lines.

Hence we can conclude that What would be seen if the dail is set on 1μ s/div is : ( B ) A (nearly) horizontal line on 1 μs/div and many (nearly) vertical lines of 100 ms/div.

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