How to identify a thyristor three pole, the anode potential is higher than the cathode potential 2, the control of both highly enough forward voltage and current are indispensable to maintain on an anode potential is higher than the cathode potential 2, the anode current is greater than Both are essential to maintain the current from the conduction to shut off an anode potential of less than 2 cathode potential, the anode current is less than any of the conditions to maintain the current 3, the basic fundamental voltage characteristic voltage characteristics of SCR SCR polarity determination way thyristor is a semiconductor material constituting the three PN junctions, their basic structure, symbols and an equivalent circuit. SCR has three electrodes: the anode (A), cathode (K) and control electrode (G). From the equivalent circuit, the anode (A) between the control electrode (G) are the two opposite polarity in series PN junction thyristor BTA412Y, a control electrode (G) between the cathode (K) is a PN junction with . According to the one-way electrical properties of the PN junction, the pointer to select the appropriate multimeter resistance profile SCR BTA216, tested positive and negative resistance between poles (same poles, will lead to exchange two resistance values ??measured) SCR BTA140, For the pros and cons of a normal SCR, G, K a big difference between the resistance; G, K, respectively, and the positive and negative A small difference between the resistance and the resistance are great. This test result is only, according to this uniqueness can determine the polarity of the thyristors. SCR BTA140 | SCR | are fertile Electronics Dongguan City is provided by Wal-Electronic Technology Co., Ltd. Dongguan City is Wal-Electronic Technology Co., Ltd. (www.dgmydz.com) (www.dgmydz.com) strong, credible, FET and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the electronics are fertile and you hand into the brilliant, for a better future!