#Cathode ray oscilloscope generator

We will discuss about special purpose oscilloscopes in next chapter. Step2 в€’ Take reciprocal of Time period of periodic signal, which is obtained in Step1 Step1 в€’ Find the Time period of periodic signal So, we can find the frequency, f of a periodic signal by following these two steps. The frequency, f of a periodic signal is the reciprocal of time period, T. $n_$ is the number of divisions that cover one complete cycle of the periodic signal in horizontal direction. Therefore, we will get the amplitude of the signal, which is present on the screen of CRO by using following formula. The amplitude of that voltage signal is constant, but we can vary the number of divisions that cover the voltage signal in vertical direction by varying volt/division knob on the CRO panel. Measurement of AmplitudeД¬RO displays the voltage signal as a function of time on its screen. Now, let us discuss about these measurements one by one. We can do the following measurements by using CRO. So, we can analyse the signals in time domain by using CRO Measurements by using CRO In this way, CRO will display the applied input signal on the screen of CRT. Finally, the deflected beam will appear as a spot on the fluorescent screen. The electron beam, which is produced by an electron gun gets deflected in both vertical and horizontal directions by a pair of vertical deflection plates and a pair of horizontal deflection plates respectively. Those are electron gun, vertical deflection plates, horizontal deflection plates and fluorescent screen. The negative high voltage and positive low voltage are applied to CRT and other circuits respectively.Д¬athode Ray Tube (CRT) в€’ It is the major important block of CRO and mainly consists of four parts. Power supply в€’ It produces both high and low voltages.

Horizontal Amplifier в€’ It amplifies the sawtooth signal and then connects it to the horizontal deflection plates of CRT.

#Cathode ray oscilloscope generator

Time base Generator в€’ It produces a sawtooth signal, which is useful for horizontal deflection of electron beam. Trigger Circuit в€’ It produces a triggering signal in order to synchronize both horizontal and vertical deflections of electron beam. This delayed signal is then applied to vertical deflection plates of CRT. Vertical Amplifier в€’ It amplifies the input signal, which is to be displayed on the screen of CRT.Дelay Line в€’ It provides some amount of delay to the signal, which is obtained at the output of vertical amplifier. The development and improvement of the cathode-ray oscilloscope encompasses a number of problems that are not strictly circuit-design exercises. The function of each block of CRO is mentioned below. The block diagram of CRO is shown in below figure.

Those are vertical amplifier, delay line, trigger circuit, time base generator, horizontal amplifier, Cathode Ray Tube (CRT) & power supply. Block Diagram of CROД¬athode Ray Oscilloscope (CRO) consists a set of blocks. In this chapter, let us discuss about the block diagram of CRO and measurements of some parameters by using CRO.

Among the oscilloscopes, Cathode Ray Oscilloscope (CRO) is the basic one and it displays a time varying signal or waveform. Oscilloscope is an electronic equipment, which displays a voltage waveform.