Question
With the help of a diagram explain the construction of a cathode ray tube. What measurements can you do by using of a CRO?
Answer :
Word Count : 1174
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Skip in 10
Cathode ray tube is a display device that is used for displaying an electrical signal upon two dimensional display screens by using principle of fluorescence that is resulted from reaction of electrons and fluorescent chemicals. It is very important part of cathode ray oscilloscope being like heart of whole oscilloscope system.
1. Electron gun assembly
2. Deflection plate assembly for deflection of electron beam
3. Fluorescent screen for production of displaying
4. Glass envelope to assemble whole cathode ray tube
5. Base to provide connection to external circuitry
The following figure shows the main part of cathode ray tube. Before we go to study all these parts in detail it will be suitable to have some basic knowledge regarding the function of these parts on individual and constitutive basis.
Electron gun assembly is the most important part of whole tube assembly that actually makes it to produce luminescence. It produces a sharp beam of electrons that are made to have very high enough acceleration and consequently a high velocity. The electrons present in this highly accelerated electron beam attains that much of energy that when they strike the fluorescent screen they tend to produce some visible luminescence. This luminescence is visible as a spot upon the screen. As sharp the electron beam come to be as is the spot on screen.
As soon as electron beam leaves electron gun it is made to pass through
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