摘要：故障现象:一台ECG-5151型心电图机,把运行开关置于STOP位置时,转动导联开关,记录笔出现大幅度的摆动. 故障分析:心电图机前置放大器主封闭电路的作用是当运行开关置于STOP档时,将耦合电容的一端接地并使前置放大器的输出端短路,从而避免记录器的大幅度摆动.
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