阴极高压电缆短路时,轻者可使X线管灯丝加热电压过低,造成管电流显著下降,致X线发射量不足;重者无X线发生,并有灯丝加变压器因短路而烧毁的可能。我院国产上海56—200毫安X线机在透视时突然X线停止发射,经检查: 1.毫安表无指示; 2.小焦点灯丝不亮; When the cathodic high-voltage cable is short-circuited, light can cause the X-ray tube filament heating voltage to be too low, resulting in a significant drop in the tube current, resulting in insufficient X-ray emission; in severe cases, no X-ray occurs, and there is a possibility that the filament plus transformer may be burned due to a short circuit . My home-made Shanghai 56-200 mAh X-ray machine in the perspective of sudden X-ray stop firing, after inspection: 1. Millimeters no indication; 2. Small focus filament does not shine;