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指针式万用表怎样测电流
更新时间： 2020-10-05 00:00:00  

指针式万用表测电流方法：

1、连接电路，使发光二极管正常发光。

2、准备万用表并将选择开关置于mA档100mA量程。

3、断开电位器中间接点和发光二极管负极间引线，形成“断点”，发光二极管熄灭。

4、将万用表串接在断点处。红表笔接发光二极管负极，黑表笔接电位器中间接点引线。发光二极管重新发光，万用表指针所指刻度值即为通过发光二极管的电流值。

关键词： 指针 怎样 电流

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