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Voltage applied to one pair plates move the beam vertically up and down and the voltages applied to other pair of plates move the beam horizontally from one side to another. Voltages applied to these plates deflects the beam. After leaving the electron gun the electron beam passes through two pairs of electrostatic deflection plates. This focused beam of electrons strikes the fluorescent screen with sufficient energy to cause a luminous spot on the screen. It produces a sharply focused beam of electrons which are accelerated to high velocity. In cathode ray oscilloscope , this is the part from where electrons are born initially. The below figure shows construction of Cathode Ray Oscilloscope. This textbook “ Electrical and Electronics Measurements by S. Construction of Cathode Ray Oscilloscope :Ī cathode ray oscilloscope consists of a cathode ray tube which is the heart of the tube and some additional circuitry to operate the CRT.The main parts of a CRT Most present day oscilloscopes are capable of accepting two or more inputs displaying them simultaneously. Although, most oscilloscope are monochromatic, colour oscilloscope are finding increasing applications in computers and in television. They are now available which can measure frequencies upto 1GHz and observer events as small as 20Hz in duration. However, it is possible to convert current, strain, acceleration, pressure and other physical quantities into voltages with the help of transducers and thus to present visual representations of a wide variety of dynamic phenomena on CRO’s.In this, I will explain Cathode Ray Oscilloscope Working Principle & Construction.Ĭathode Ray Oscilloscopes are used to investigate waveforms, transient phenomena and other time varying quantities from a very low frequency range to the radio frequencies. Cathode Ray Oscilloscopes operate on voltages. Cathode Ray Oscilloscope is a very useful and versatile laboratory instrument used for display, measurement and analysis of waveforms and other phenomena in electrical and electronic circuits.CRO’s are in fact very fast X-Y plotters, displaying an input signal versus another signal versus time.