1. Oscilloscope tube, also known as cathode ray tube, is sealed in a high vacuum glass shell. Its structure is shown in figure 1, which mainly includes three parts: the front end is a fluorescent screen, (s, used to

2. The principle of electric focusing The focusing of electron beam is a problem that electron beam tube must solve. In the oscilloscope tube, the cathode is heated to emit electrons, which are accelerated by the positive electric field generated by the anode and simultaneously generated by the grid.

3. The principle of electric deflection in oscilloscope tube, after electrons escape from heated cathode K,