![]() The control grid is usually a nickel cylinder with a centrally located co-axial with the CRT axis. For gaining the high emission of electrons at the moderate temperature, the layers of barium and strontium is deposited on the end of the cathode.Īfter the emission of an electron from the cathode grid, it passes through the control grid. The electron gun mainly consists a heater, cathode, a grid, a pre-accelerating anode, a focusing anode and an accelerating anode. The electron gun emits the electrons and forms them into a beam. These movements are independent to each other and hence the beam may be positioned anywhere on the screen. The vertical deflection plate moves the beams up and down and the horizontal beam moved the electrons beams left to right. The cathode ray tube mainly consists the electron gun and the electrostatic deflection plates (vertical and horizontal).The electron gun produces a focused beam of the electron which is accelerated to high frequency. ![]() The cathode ray tube is the vacuum tube which converts the electrical signal into the visual signal. Their parts are explained below in details. The main parts of the cathode ray oscilloscope are as follows. ![]() Thus, CRO provides a means of the visualising time-varying voltage. When the input voltage moves very fast on the screen, the display on the screen appears stationary. The vertical voltage moves the luminous spot up and down on the screen. The vertical voltage is the voltage under investigation. ![]() The horizontal voltage moves the luminous spot periodically in a horizontal direction from left to right over the display area or screen. The normal form of the CRO uses a horizontal input voltage which is an internally generated ramp voltage called “time base”. This luminous spot is produced by a beam of electrons striking on a fluorescent screen. The CRO has Stylus (i.e., a luminous spot) which move over the display area in response to an input voltage. It is also used for knowing the waveforms, transient phenomenon, and other time-varying quantity from a very low-frequency range to the radio frequencies. Thus, the other physical quantity like current, strain, acceleration, pressure, are converted into the voltage with the help of the transducer and thus represent on a CRO. ![]()
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