有些农村电工问:手边有一些旧的晶体三极管,想使用时它们的型号看不清,怎样来识别它们是好管还是坏管?是什么样的管型?是高频管还是低频管?是硅管还是锗管?下面告诉你,用一只万用表就能全部回答出来;一、好管与坏管的识别检查三极管的好坏是通过测量PN结的极间电阻 Some rural electricians ask: Have some of the old transistors at hand, want to use them when the model is not clear, how to identify them is good or bad tube? What kind of tube? Is the high frequency tube or the low frequency tube? Silicon tube or germanium tube? Tell you below, with a multimeter will be able to answer all; First, good and bad tube identification Check the transistor is good or bad by measuring the PN junction resistance