CRO full form | What does CRO means ?

Cathode-Ray Oscilloscope (CROThe ) is an instrument that displays and measures electrical signals, time intervals, phase shift, and other parameters. It is used extensively in laboratories to analyze and measure waveforms of different electronic and electrical circuits.

Cathode Ray Oscilloscope Construction

These are the main components of the cathode-ray oscilloscope.

  1. Cathode Ray Tube
  2. Electronic Gun Assembly
  3. Deflecting Plate
  4. Fluorescent Screen for CRT
  5. Glass Envelope

These parts are described in detail below.

1. Cathode Ray Tube

The cathode-ray tube is the tube that converts electrical signals into visual signals. The cathode-ray tube is made up of the electrostatic deflection plate (vertical and horizontal) and the electron gun. This creates a concentrated beam of electron that is accelerated to high frequencies.

The beams are moved up and down by the vertical deflection plate, while the horizontal beam moves electron beams from left to right. The beam can be placed anywhere on the screen because they are independent of each other.

2. Electronic Gun Assembly

The electron gun emits electrons and makes them into a beam. The electron gun is mainly composed of a heater, cathode. A grid. The layers of strontium and barium are deposited at the end of the cathode to increase the emission of electrons at moderate temperatures.

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After an electron is emitted from the cathode grid it passes through control grid. The control grid is typically a nickel cylindrical with a centrally placed co-axial with CRT axis. It controls the intensity and polarization of the electrons emitted from the cathode.

The control grid accelerates the electron as it passes through the control grid. A high positive potential is applied to the pre-accelerating and accelerating nodes.

After the electron beam passes through the focusing electrodes, it then passes through the horizontal and vertical deflection plates before reaching the fluorescent lamp. The pre-accelerating and the accelerating anode are connected at 1500 v and the focusing electrode at 500 v. These are the two ways to focus on the electron beam. These are the methods.

  • Electrostatic focusing
  • Focusing with electromagnetism

The CRO uses an electric focusing tube.

3.Deflecting plate

After leaving the electron gun, the electron beam passes through the deflecting plates. The plate that produces vertical deflection, or Y plates is the vertical deflecting pair. The horizontal deflection plate, or X plates, is the pair of plates that produce horizontal deflection.

4. Fluorescent Screen for Computer-Remote Testing

The face plate is located at the front of the CRT. The face plate can be used for screens up to 100x100mm. For larger displays, the screen of CRT can be slightly bent. For the face plate, you press the molten glass in a mold and then anneal it.

Phosphor crystal is used to coat the inside of the faceplate. The phosphor crystal converts electrical energy to light energy. An electronics beam striking a phosphor crystal causes it to increase its energy and light is emitted during the phosphorous crystallisation. Fluorescence is the name of this phenomenon.

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5. Glass Envelope

It has a conical shape and is highly evacuated. The aquadag is applied to the inner surface of CRT between neck and screen. The aquadag, a conductor material that acts as a high voltage electrode, is applied to the CRT’s inner surface between the neck and screen. The coating surface is connected electrically to the anode, accelerating electrons.

Cathode Ray Oscilloscope:

The control grid is activated when the electron is injected into the electron gun. It controls how intense the electrons are in the vacuum tube. The control grid with a high negative potential will only allow a small number of electrons through it. The lightning screen produces the dim spot. The bright spot will be produced if the negative potential on control grid is low. The negative potential on the control grid determines the intensity of the light.


The control grid is moved and the electron beam passes through the focusing anodes. The beam converges at a specific point on the screen because the accelerating anodes have a high potential.

This is now subject to the deflecting plates after it has moved from the acceleration anode. The beam will produce a spot at its centre if the deflecting plates are at zero potential. If the voltage is applied horizontally, the spot of light is deflected horizontally.

Frequently Asked Questions (FAQ).

What is the full meaning of CRO in Measuring instruments?

CRO can be taken in its entirety Cathode-Ray Oscilloscope

What is CRO in Technology?

Cathode-Ray Oscilloscope

What are the full forms and functions of CRO worldwide?

Contract Research Organization

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