![]() ![]() Application of one cycle of this voltage difference, which increases linearly with time, to the horizontal plates causes the beam which deflects linearly with time across the tube face. The voltage output of such a generator is that of a sawtooth wave as shown in Fig. ![]() The linear deflection or sweep of the beam horizontally is accomplish by use of a sweep generator that is incorporated in the oscilloscope circuitry. The signal impose to the vertical plates is thus displays on the screen as a function of time and The horizontal axis serves as a uniform time scale. In the most common use of the oscilloscope the signal is first amplifies and impose to the vertical (deflection) plates to deflect the beam vertically and at the same time a voltage which increases linearly with time is apply to the horizontal deflection plates thus cause the beam to deflect horizontally at a constant rate. This coversion of electron energy into light allows us to write with points or lines of light on an otherwise darkened screen. then Wherever the electron beam hits the screen, the phosphor excits and light emits from that point. moreover The combination of these two deflections allows the beam to reach any portion of the fluorescent screen. The plates are thus refer to as the horizontal and vertical deflection plates. Between the electron gun and the fluorescent screen are two pair of metal plates – one orients to provide horizontal deflection of the beam and one pair oriented ot give vertical deflection to the beam.
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