VME-48316-32F
VME-48316-32F
VME-48316-32F
万用表分为指针式和数字式，它们各有方便之处，很难说谁好谁坏，好是能够备有指针和数字式的各一个。业余电子制作有一个指针式的MF30型万用表也就可以了，这可是一种经典型号。还有元老级的MF500型万用表，廉价的MF50万用表，一般都可以在电讯商店买到。
万用表的三个基本功能是测量电阻电压电流，所以老前辈们叫它三用表。现在的万用表添加了好多新功能，尤其是数字式万用表，如测量电容值，三极管放大倍数，二极管压降等，更有一种会说话的数字万用表，能把测量结果用语言播报出来。
对于电子初学者，建议使用指针式万用表，因为它对我们熟悉一些电子知识原理很有帮助。《指针式万用表使用与原理》将为我们介绍一些机械指针式万用表的原理和使用方法。
万用表大的特点是有一个量程转换开关，各种功能就是靠这个开关来切换的。基本上，用A-来表示测直流电流，一般毫安档和安培档各又分几档。V-表示测直流电压，高级点的万用表有毫伏档，电压档也分几档。V~是用来测交流电压的。A~测交流电流。Ω欧姆档测电阻，对于指针式万用表，每换一次电阻档还要做一次调零。调零就是把万用表的红表笔和黑表笔搭在一起，然后转动调零钮，使指针指向零的位置。hFE是测量三极管的电流放大系数的，只要把三极管的三个管脚插入万用表面板上对应的孔中，就能测出hFE值。注意PNP管的E、B、C三极分别是P型、N型、P型半导体，NPN管正好相反。
备货，备货，降降降，火火火，火火火……
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