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一台新200mAX光机安装使用正常，半年后因某种原因拆除放置达6年，现重新安装。根据图纸技术要求，调试低压电路基本正常。而后接通高压，选用低仟伏预热驱潮8小时。再用低KV－mA－S进行曝光试验，按下曝光按钮毫安表指针立即打到头，超过量程。在重新确定联接线无错误的情况下
A new 200mA X-ray machine was installed and used normally. After six months, it was removed for some reason and placed for 6 years. Now it is reinstalled. According to the technical requirements of the drawings, debugging low-voltage circuits is basically normal. Then turn on the high pressure, use low enthalpy volt to preheat 8 hours. Then use a low KV-mA-S for the exposure test. Press the exposure button and the milliammeter pointer immediately hits the end of the measurement range. When re-determining the connection line without error