In CRO, _____________ is NOT a part of the vertical deflection system.

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NHPC JE Electrical 5 April 2022 (Shift 1) Official Paper
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  1. time base generator
  2. main amplifier
  3. preamplifier
  4. delay line

Answer (Detailed Solution Below)

Option 1 : time base generator
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Oscilloscope:
  • An oscilloscope is a piece of electronic equipment, which displays the waveform.
  • Among the oscilloscopes, Cathode Ray Oscilloscope (CRO) is the basic one and it displays a time-varying signal or waveform.
F1 Nakshtra 04-2-22 Savita D1
 

The function of each block of CRO is mentioned below:

  1. Vertical Amplifier: It amplifies the input signal, which is to be displayed on the screen of CRT.
  2. Delay Line: It provides some amount of delay to the signal, which is obtained at the output of the vertical amplifier. This delayed signal is then applied to vertical deflection plates of CRT.
  3. Trigger Circuit: It produces a triggering signal in order to synchronize both horizontal and vertical deflections of the electron beam.
  4. Time base Generator: It produces a sawtooth signal, which is useful for horizontal deflection of the electron beam.
  5. Horizontal Amplifier: It amplifies the sawtooth signal and then connects it to the horizontal deflection plates of CRT.
  6. Power supply: It produces both high and low voltages. The negative high voltage and positive low voltage are applied to CRT and other circuits respectively.
  7. Cathode Ray Tube (CRT): It is the major important block of CRO and mainly consists of four parts. Those are electron guns, vertical deflection plates, horizontal deflection plates, and fluorescent screens.
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