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单向可控硅怎么测量好坏
单向可控硅怎么测量好坏
2025-03-15 19:29:41
推荐回答(1个)
回答1:
单向
可控硅
用万用表测量好坏
用电阻x1k档,正、反向测量A、K之间的电阻值,均接近无穷大;用电阻x10Ω档测量G、K之间的电阻,从十几欧姆至百欧姆,功率越大欧姆值越小。
正、反向电阻值相等或差异极小。说明可控硅的G、K并不像一般三极管的发射结,有明显的正、反向电阻的差异。
这种测量方式是有局限性的,当A、K之间已呈故障开路状态时,则无法测出好坏。有的G、K间电阻值极小,也难以判别两控制极是否已经短路
如阴极A接黑表笔,阴极K接红表比时,万用表的指针发生偏转,就说明这单向可控硅已经遭到损坏。
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