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怎样用万用表量电源适配器的好坏

更新时间: 2020-07-06 00:00:00     

通电的情况下量输出电压,空载输出电压要比额定电压大几伏,有条件还可以串联量它的负载电流。圆孔输出一般是内正外负,也就是里面那个针是正极,外面圆圈是负极。万用表调到直流电压档,红色表笔接里面那个针,黑色表笔接外面圆圈。注意不要短路。USB接口的测量,它里面有四根铁或铜片,中间两根是信号线,最外面两根是电源线,你量最外面两根就知道电压,注意表笔不要碰外面铁片以免引起短路。

关键词: 怎样 电源 配器 好坏

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