Controls of Cathode Ray Oscilloscope (CRO)

Position

The position control knob on an oscilloscope is mostly used to move the intense point from the left to the right. One can easily move the place from the left side to the right side by using the knob.

Brightness

The electron's intensity has a significant impact on the ray's brightness. The electron ray's electron intensity is determined by the control grids. As a result, the brightness of the electron rays can be changed and adjusted accordingly to control the grid voltage.

Focus

By adjusting the applied voltage to the CRO's center anode, the focus can be controlled. The electrostatic lens can be created using the center and additional anodes nearby. As a result, by adjusting the voltage across the center anode, the main length of the lens can be altered.

Astigmatism and Blanking circuit

The CRO oscilloscope's time base generator produced the blanking voltage. This additional focusing control in CRO is comparable to astigmatism in optical lenses.

Due to the different lengths of the electron pathways at the center and the corners of the screen, a beam that is focussed in the monitor's middle would be defocused here. The oscilloscope's time base generator produced the blanking voltage.

Graticule

It is the grid on the display screen of the CRO that consists of the horizontal and vertical axis. 

Input impedance

The input impedance is greater than 1 Megaohms, a high value of impedance is used to prevent the circuit from the scope from being tested. To match fast amplifiers and other devices.