实例:一台新双桶洗衣机电气线路如图1所示，开始是脱水桶转动无力，不久就会完全不动了。曾先后检查各部位线路无任何异常，用万用表测试电机及开关、定时器、电容器各个接点均正常。所以笔者把注意力集中到脱水电机电容器上；这是一个4μF，耐压为450V的无极性电解电容，用万 Example: The electrical circuit of a new double barrel washing machine is shown in Figure 1. The dehydration barrel starts to rotate and is unable to move. It will soon be completely stopped. It has inspected all parts of the circuit without any anomalies. It is normal to use a multimeter to test the motor and switches, timers, and capacitors. So the author focused his attention on the dehydrating motor capacitor; this is a 4μF, non-polar electrolytic capacitor with a voltage of 450V.