# Electrostatic Focusing in Cathode Ray Oscilloscope CRO | Summary and Q&A

5.8K views
April 7, 2022
by
Ekeeda
Electrostatic Focusing in Cathode Ray Oscilloscope CRO

## TL;DR

This video explains the electrostatic focusing in cathode ray oscilloscope (CRO) and how it affects the beam of electrons.

## Install to Summarize YouTube Videos and Get Transcripts

### Q: How does a cathode ray oscilloscope work?

A cathode ray oscilloscope displays waveforms by using an electron gun to produce a focused beam of electrons, which is deflected by plates and strikes a phosphor screen to create a spot that moves according to the input signal.

### Q: What is electrostatic focusing in a CRO?

Electrostatic focusing refers to the process of using voltage applied to the deflection plates in a CRO to create an electrostatic field that deflects the beam of electrons. This focusing ensures that the electrons move in a controlled manner and strike the phosphor screen accurately.

### Q: How is deflection sensitivity calculated in a CRO?

Deflection sensitivity is calculated by dividing the deflection of the screen (d) by the deflection voltage (e_d). The formula for deflection sensitivity (s) is s = d/e_d.

### Q: What is the relationship between deflection factor and the accelerating voltage in a CRO?

The deflection factor (g) in a CRO is the reciprocal of the deflection sensitivity. It is directly proportional to the accelerating voltage. Increasing the accelerating voltage leads to an increase in the deflection factor.

## Summary & Key Takeaways

• The cathode ray oscilloscope (CRO) is used to display, measure, and analyze waveforms and phenomena in electrical and electronic circuits.

• The CRO uses an electron gun to produce a focused and energized beam of electrons, which is deflected by vertical and horizontal plates.

• The deflected beam strikes a phosphor screen, producing a luminous spot that moves according to the input signal.