Cathode Ray Oscilloscope [CRO] →
🔸CRO is used to display Measure, and analyze varioust typesof waveforms and other Phenomena in electrical and electronic ckt.
🔸CRO is a test instrument which allows an individual to "plot" and "view" two - dimensional graph of electronic signal
Components of CRO →
1) Cathode Ray tube (CRT)
2)vertical amplifier
3) Delay line
4) Horizontal amplifier
5)Time - Base Generator
6) triggering circuits
7) power supply
Cathode ray tube [CRT]=
* Heart of CRO
*CRT is a vacuum sealed glass envelope that has a source of electrons which which emits electron that are accelerated to pass through two - pairs of plates before striking a phosphor coated screen internally so as to provide a visual display of signal.
Various part of CRT -
(i) Electron gun
(ii) Deflection plate System
(iii) Fluorescent screen
(iv) Glass envelope
(v) Base
(i) Electron gun =
*Source of accelerated, energised and focused beam of electrons.
Consists of
1) heater →
*to heat the cathode
2) Cathode →
* generates the electrons
* Coated with a layer of barium oxide.
3) control grid →
* made up of nickel .
*Controls the number of electrons.
*Intensity is also controlled.
4) pre - accelerating and accelerating anode →
* Accelerating the electrons.
*Connected to a common positive potential of 1500 volts
5) focusing anode → * focus the electron beam.
*Connected to a potential of 500 volts
(i)Deflection system =
Two pairs of plates
{1}Horizontal plates
{2} vertical plates
