Cathode Ray Oscilloscope are defined by Explained.

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CRO are characterized
The single are instrument in electronic is called Cathode Ray Oscilloscope. Its measure voltage (ac or dc), frequency and wave shape of the input signal.
      It can also be produced by a picture of the shape are input signal on a light emitting phosphor screen.
           The CRO is a vacuum tube is called Cathode Ray tube(CRT).
Principal are CRT:-
    CRT the fluorescent phosphor screen. Vertical and horizontal deflection plates.The accelerating electrode, focus electrode and electron gun are electron beam.
The cathode is surrounded by a negative charged cylindrical control electrode a hole in one end.They are kinetic energy in the form of light energy.
Note:-
That both first and second anodes work together to form the electron lens not dissimilar in function to an optical lens.
          It is usually of Oscilloscope designer to hold the high voltage applied to the second anode constant and the use to potentiometer labelled focus to vary the potential applied to the first anode.A-1500- V dc power supply is connected to a resistor voltage divider network consists of R1 through R3.Potentiometer R3 varies the potential applied to the control electrode,designed as grid 1. The function of intensity control.
        Potentiometer R2 serves as a focus control and varies the potential applied to the focus electrode,designed as anode 1.
The structure inside a CRT are referenced to structure of an ordinary vacuum tube.
       The second anode is at a potential of zero volts i.e.,grounded. A potential i.e.,more positive that the other electrodes.The second anode potential may be slightly positive i.e.,0 to+150 V.
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