显像管要正常发光,除各极要加上额定的电压外,阴极还要被灯丝加热到一定的温度。阴极温度的上升和下降都需要一定的时间,即显像管阴极具有热惰性。这个热惰性的表现是:电视机开启时显像管是慢慢亮起来的,关机时本来应该在显像管中央长时间出现亮 CRT to normal light, in addition to the need to add the rated voltage, the cathode has been heated to a certain temperature filament. It takes a while for the cathode temperature to rise and fall, ie, the cathode of the tube is thermally inert. The performance of this hot inertia is: when the TV is turned on the picture tube is slowly lit, the shutdown should have been in the CRT for a long time bright