Describe with the aid of a well labelled diagram, the structure and mode of operation of a C.R.O 

Describe with the aid of a well labelled diagram, the structure and mode of operation of a C.R.O

The cathode ray oscilloscope consists of

• cathode C (Electron gun) produces electron by thermionic emission
• Grid G controls number of electrons reaching the screen
• Anodes, A accelerate electrons
• Y and X- plates deflect electrons vertically and horizontally respectively
• The screen is coated with zinc sulphide to glow when hit by electron
• Time base is connected to X- plates and provides a saw tooth p.d that sweep the electron spot from left to right of the screen at steady speed

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