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指针式万用表的正负极
更新时间: 2020-10-05 00:00:00  

1、红色是正极,黑色是负极;

2、只有指针表测量电阻时,内部接线是黑笔接的电池的正极,红笔接的电池的负极;

3、黑笔输出正极,红笔输出负极;

4、在测二极管时,黑笔表示二极管的正极,红笔表示二极管的负极。

关键词: 指针 负极

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