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1.普通测试贴片晶闸管的电极有的可以根据外形来判断(阳极一般位于单独一边,阳极引出端宽或者粗,如图1所示),有的可以通过万用表检测来判断。万用表检测判断主要是根据其内部PN结的具体情况不同则阻值不同来判断:单向晶闸管是一个四层三端元件,有三个PN结,其中门极C和阴极K之间是一个PN结(见图2)。先找到这个PN结,就可确定三个电极的位置:将万用表置于R×l kΩ档,将晶闸管其中一端假定为门极,与黑表笔相接。用红表
1. Ordinary test chip thyristor electrodes can be judged according to appearance (anode generally located on a separate side, the anode leads to a wide or thick, as shown in Figure 1), and some can be judged by the multimeter test. Multimeter detection is mainly judged according to the specific circumstances of its internal PN junction is different from the different resistance to determine: Unidirectional thyristor is a four-layer three-terminal components, there are three PN junction, which is between the gate C and cathode K is a PN junction (See Figure 2). First find the PN junction, you can determine the location of the three electrodes: The multimeter placed R × lkΩ file, one end of the thyristor assumed to be the gate, and the black pen phase. With red sheet