SCR polarity determination multimeter R × 1K range measuring positive and negative resistance SCR poles, positive and negative resistance to elect two very big difference, which that measure the resistance measured in smaller In the black pen connects to a control electrode (G), red table pen connects to the cathode (K) SCR, and the rest on a pole as the anode (A). By determining the polarity of thyristor also be qualitatively determined that the SCR is good or bad. If the test in positive and negative resistance to any difference between the poles are small, its resistance are great SCR BT134W-600E, instructions G, open-circuit fault exists between K; if there is positive and negative resistance between two poles are small and close to zero SCR T405-800T, the SCR internal short circuit fault exists between the poles. A high voltage thyristor way to monocrystalline silicon base material for P1N1P2N2 four three-terminal device, created in 1957, due to its characteristics similar to the vacuum thyratron, so called silicon transistor gate through the international flow tube, referred SCR T. Also, because the thyristor controlled rectifier initially applied to aspects of so called silicon controlled rectifier elements, referred to as SCR SCR. SCR BT137S-600E_ are fertile Electronics (certified) _ SCR Dongguan City is provided by Wal-Electronic Technology Co., Ltd. Dongguan City is Wal-Electronic Technology Co., Ltd. (www.dgmydz.com) (www.dgmydz.com) is Dongguan, FET leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum limits to meet customer needs. Wal-electronics leader in the positive with the staff warmly welcome all inquiries negotiations to create a positive future Wal-electron better.