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本院西门子Ｍ－７４４５型加速器在正常使用时，突然停机，故障表现为：一开机即停，经检查，调制器高压电源变压器开关ＣＢ３（ＭＯＤＵＬＡＴＯＲＰＯＷＥＲＳＵＰＰＬＹＴＲＡＮＳＦＯＲＭＥＲ）跳闸。用示波器观察：没有ＰＵＬＳＥＩ（磁控管脉冲电流）波形，说明调制器没
The Siemens M-7445 accelerometer of this hospital was suddenly stopped during normal use. The failure was as follows: a start-up was stopped. Upon inspection, the modulator high-voltage power transformer switch CB3 (MODULATOR POWER SUPPLY TRANSFORMER) tripped. Observe with an oscilloscope: There is no PULSEI (magnetron pulse current) waveform, indicating that the modulator is not