The voltages of negative high voltage supply is from -1000V to -1500V. Power supply block of oscilloscope is classified in to two types The voltages require by CRT, horizontal amplifier and vertical amplifier are provided by the power supply block. Hence input signal and the sweep frequency can be synchronized. The signals which are used to activate the trigger circuit are converted to trigger pulses for the precision sweep operation whose amplitude is uniform. The saw tooth voltage produce by the time base circuit is amplified by the horizontal amplifier before it is applied to horizontal deflection plates. The spot is deflected by the saw tooth voltage at a constant time dependent rate. The saw tooth voltage produced by the time base circuit is required to deflect the beam in the horizontal section. Time base circuit uses a uni junction transistor, which is used to produce the sweep. Therefore, the input signal is delayed by a period of time. The input signal is not applied directly to the vertical plates because the part of the signal gets lost, when the delay Time not used.

Usually, the vertical amplifier is a wide band amplifier which passes the entire band of frequencies.Īs the name suggests that, this circuit is used to, delay the signal for a period of time in the vertical section of CRT.

The input signals are amplified by the vertical amplifier. When the electrons emitted by the electron gun strikes the phosphor screen of the CRT, a visual signal is displayed on the CRT. The major subsystem of a general purpose CRO consists of the following In the same way for CRO, the luminous spot of the electron beam acts as a stylus that moves over the display area in a response to input voltages. These are basically very fast x - y plotters that display input signal versus another signal. CRO is an extremely useful and versatile laboratory instrument used for the measurementĪnd analysis of waveforms and other phenomena in electronic circuits.

Digital cathode ray oscilloscope