![]() ![]() When the signal voltage is applied to the vertical plates and saw-tooth wave to the horizontal plates,we get the exact pattern of the signal on the screen as shown in fig. In this way, the saw tooth wave applied to horizontal plates moves the beam from left to right at a uniform rate. Īs the time progresses, the negative voltage decreases linearly with time and the beam moves towards right forming a horizontal line. In order to move the beam from left to right at a uniform rate, a voltage that varies linearly with time should be applied to the horizontal plates.This can be achieved by applying a saw tooth wave as shown in fig below.Īt time t=0, the negative voltage on the horizontal plate keep the beam to the extreme left on the screen as shown in the above figure. To see the signal voltage variation with time on screen we have to move the beam horizontally from left to right at a uniform speed while it is moving up and down.Īgain as soon as a full cycle of the signal is traced, the beam should return quickly to the left hand side of the screen so that it can start tracing the second cycle. This line gives no indication of the manner in which the voltage is alternating hence we can not get the wave shape.Īpplying Saw-tooth Wave Across Horizontal Plates Since the frequency of the applied voltage is 50 Hz, hence we will see a continuous vertical line 2-1-4 on the screen as shown in fig below. Thus, in the positive half cycle, upper plate is positive and lower plate is negative and in the negative half cycle, the plate polarities are reversed.Īs a result, the spot moves up and down at the same rate as the frequency of the applied voltage. When a sinusoidal voltage is applied to the vertical deflection plates, it makes the plates alternately positive and negative. Display of signal waveforms on CRO Applying Signal Across Vertical Plates ![]() I f the waveforms are identical in shape, the fidelity of the amplifier is excellent.īefore discussing the next applications let us see how the signal waveform is displayed on CRO . With the help of switch S, the output and input of amplifier is applied in turn to the vertical input terminals of the CRO. ![]()
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