西屋 1661D89G06 大卖

西屋 1661D89G06

【变量2】　　冬节月中央，无雪也无霜。(冬节在月中，当年冬天很少有霜雪。)

电容器的检测方法与经验 1固定电容器的检测 A检测10pF以下的小电容
因10pF以下的固定电容器容量太小，用万用表进行测量，只能定性的检查其是否有漏电，内部短路或击穿现象。测量时，可选用万用表R×10k挡，用两表笔分别任意接电容的两个引脚，阻值应为无穷大。若测出阻值(指针向右摆动)为零，则说明电容漏电损坏或内部击穿。B检测10PF～001μF固定电容器是否有充电现象，进而判断其好坏。万用表选用R×1k挡。两只三极管的β值均为100以上，且穿透电流要小。可选用3DG6等型号硅三极管组成复合管。万用表的红和黑表笔分别与复合管的发射极e和集电极c相接。由于复合三极管的放大作用，把被测电容的充放电过程予以放大，使万用表指针摆幅度加大，从而便于观察。应注意的是：在测试操作时，特别是在测较小容量的电容时，要反复调换被测电容引脚接触A、B两点，才能明显地看到万用表指针的摆动。C对于001μF以上的固定电容，可用万用表的R×10k挡直接测试电容器有无充电过程以及有无内部短路或漏电，并可根据指针向右摆动的幅度大小估计出电容器的容量

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