TRICONEX 3624

表笔插位同上；其原理同二极管。先假定Ａ脚为基极，用黑表笔与该脚相接，红表笔与其他两脚分别接触其他两脚；若两次读数均为０.７Ｖ左右，然后再用红 笔接Ａ脚，黑笔接触其他两脚，若均显示"１"，则Ａ脚为基极，否则需要重新测量，且此管为ＰＮＰ管。那么集电极和发射极如何判断呢？数字表不能像指针表那 样利用指针摆幅来判断，那怎么办呢？

我们可以利用“hFE”档来判断：先将档位打到“hFE”档，可以看到档位旁有一排小插孔，分为PNP和NPN管的测 量。前面已经判断出管型，将基极插入对应管型“b”孔，其余两脚分别插入“c”，“e”孔，此时可以读取数值，即　　　β值；再固定基极，其余两脚对调； 比较两次读数，读数较大的管脚位置与表面“c”，“e”相对应。

小技巧：上法只能直接对如９０００系列的小型管测量，若要测量大管，可以采用接线法，即用小导线将三个管脚引出。这样方便了很多哦。

六、MOS场效应管的测量

　　Ｎ沟道的有国产的３Ｄ０１，４Ｄ０１，日产的３ＳＫ系列。Ｇ极（栅极）的确定：利用万用表的二极管档。若某脚与其他两脚间的正反压 降均大于２Ｖ，即显示“１”，此脚即为栅极Ｇ。再交换表笔测量其余两脚，压降小的那次中，黑表笔接的是Ｄ极（漏极），红表笔接的是Ｓ极（源极）。

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