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万用表怎么测按钮常开常闭点
更新时间: 2021-01-04 13:47:12  

1、应先把万用表调为电压表,检查接入触点的线路是否有电压,再检查常开常闭触点。

2、用电压表的两表笔接在常开点两端,如果显示没有电压,则将万用表调欧姆档,把两表笔接在触点两端,万用表显示为0,则为常开触点,若万用表有数据,约为0.1–1Ω,则为常闭触点

3、如果有电压,则可得出触点为常开点,此时也禁止再调欧姆档去检查,因为调欧姆档,两表笔接入后,万用表相当于一根导线,这相当于给常开点一个短路,使常开变成了常闭,这时可能会烧坏万用表,甚至把现场装置该线路导通,产生不可估计的危险。

关键词: 怎么 按钮

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