Which of the following part is not located inside the cathode ray tube of the CRO?

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  1. Electron gun
  2. Time base generator
  3. Vertical deflection plates
  4. Horizontal deflection plates

Answer (Detailed Solution Below)

Option 2 : Time base generator
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Detailed Solution

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Concept:

The CRO stands for a cathode ray oscilloscope.it consists of a set of blocks which are, shown in the following block diagram.

F1 Shraddha Jai 16.01.2021 D19

Subparts of Cathode Ray Tube are

  • Electron gun: It emits electrons and forms them into a beam with the help of a heater, cathode, grid, and pre-accelerating, accelerating, and focusing anode.
  • Vertical deflection plates: VDP is applied with a test signal. Whose waveform has to be observed on the screen VDP is kept in Horizontal position.
  • Horizontal deflection plates:  HDP is used for shifting the electron beam horizontally i.e. horizontal time scale is adjusted by changing HDP potential manually.
  • Screen: A standard screen size is 8 cm by 10 cm. The screen is coated with phosphor that emits light when struck by the electron beam

Hence, the Time-base generator is a part of CRO but not a part of CRT.

Uses of CRO:

  • Used to measure the voltage, current, frequency, inductance, admittance, resistance, and power factor.
  • used to monitor the signal properties as well as characteristics and also
  • Used to control the analog signals.

Important Points

  • Vertical deflection plates are mounted horizontally.
  • Horizontal plates are mounted vertically as shown in the block diagram. 
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