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当我们选择晶体二极管时,通常用万用表的电阻挡,测试二极管的正、反向直流电阻值,以判断其质量的优劣。在测试过程中,我们会发现用万用表的不同挡位测试同一个二极管的正向直流电阻时,其值也不相同,例如用R×10挡测出的电阻值小,而R×100挡测出的电阻值大,这是什么缘故呢? 究其根本原因是由于二极管的非线性特性,即二极管的电压和电流不是成正比关系,所以当不同的电流通过二极管时,电压和电流的比值(就是万用表测出
When we choose the crystal diode, we usually use the electric resistance of the multimeter to test the forward and reverse DC resistance values of the diode to judge the quality of the diode. In the test process, we will find that when the same DC resistance of the same diode is tested with different gears of the multimeter, the value is not the same, for example, the resistance value measured with R×10 gear is small, and the R×100 gear measurement is small. What is the reason for the large resistance value? The fundamental reason is due to the non-linear characteristics of the diode, that is, the voltage and current of the diode are not proportional to each other, so when different currents pass through the diode, the voltage and current ratio ( Is a multimeter measuring