描述
极管的判断好坏,可按下面方法进行:
1.基极和管子类型的判别方法:
测量的锗管用R×100档,硅管用R×1K档,先固定红表笔与任意一支脚接触,黑表笔分别对其余两支脚测量。看能否测量到两次较小电阻值,若不能再把红表笔移向其他的脚继续测量到两个小电阻为止,若固定红表笔找不到两个小电阻,可固定黑表笔继续查找。当找到两个小电阻后,被固定的一支表笔所用的脚为基极。
若固定的表笔为黑表笔,则三极管为NPN型,若固定的为红表笔,则该管为PNP。
2.判别集电极:
因为三极管发射极和集电极正确连接时β大(表针摆动幅度大),反接时β就小得多。因此,先假设一个集电极,用欧姆档连接,(对PNP型管来说,发射极接黑表笔,集电极接红表笔)。测量时,用手捏住(或用100KΩ的电阻连接)基极和假设的集电极,两极不能接触,若指针摆动幅度大,而把两极对调后指针摆动小,则说明假设是正确的集电极,从而确定集电极和发射极。
按你上面所述的阻值的三极管不是万用表有问题,就是三极管是坏的。还是先找一个好的三极管按上面的方法测量以后再作比较,就能判断出好坏以及总结经验。
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