| 摘要 |
PURPOSE:To enable the saturation point of electron beams to be easily found out when performing the heating regulation of a cathode, by comparing a cathode heating electric power in proportion to a temperature of the cathode with an emission quantity of the electron beams. CONSTITUTION:The output power voltage of a power source 4 proportional to the heating temperature of a cathode 1 is shown by a meter 15. And the quantity of electron beams is shown by a meter 14. Here the meters 14 and 15 are adjacently arranged so that each of the meter defletions can be comparably obseved. The delecting amount of meter 15 gradually increases in proportional to the increases of the power voltage in use. On the contrary, the meter 14 comes to almost stand still at the saturation point. Thus a comparison of deflection of the both meters 14, 15 causes a state of saturation of the electron beam to be clearly known at a glance. |
