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毫安表的满幅故障,多系高压部分故障引起,一般可按以下步骤快速判别: 先拔下高压发生器端的电压电缆,再通高压试验。如毫安表指针不动,说明故障在高压电缆和X线管,一般均为高压电缆头端击穿或X线管真空度降低。如毫安表仍为满刻度,说明故障在高压发生器,一般为整流管真空度降低、高压变压器局部短路或烧毁、灯丝变压器对地击穿、变压器油耐压降低等,
The full-scale fault of the milliammeter is caused by high-voltage partial faults. Generally, the following steps can be used to quickly determine: First, unplug the high-voltage generator voltage cable, and then pass the high-voltage test. If the milliammeter pointer does not move, it indicates that the fault is in the high-voltage cable and the X-ray tube. Generally, the head-end breakdown of the high-voltage cable or the degree of vacuum of the X-ray tube is reduced. If the milliampere meter is still full-scale, it means that the fault is in the high-voltage generator. Generally, the vacuum of the rectifier is reduced, the high-voltage transformer is partially short-circuited or burned, the filament transformer is punctured to ground, and the transformer oil pressure is reduced.