The cathode-ray oscilloscope (C.R.O.) consists of the following components:
- The electron gun.
- The deflecting plates.
- A fluorescent screen.
The electron gun
|Parts of Electron Gun||Function|
|Filament||To heat the cathode.|
|Cathode||Release electrons when heated by filament.|
|Focusing Anode and||
The deflecting plates
|Part of the deflecting system||Function|
|Y-plate||The Y-plates will cause deflection in the vertical direction when a voltage is applied across them.|
|X-plate||On the other hand, the X-plates will cause the electron beam to be deflected in the horizontal direction if a voltage is applied across them.|
The fluorescent screen
- The screen is coated with a fluorescent salt, for example, zinc sulphide.
- When the electrons hit the screen, it will cause the salt to produce a flash of light and hence a bright spot on the screen.