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 2P6M, remaining a pole on 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 large, indicating G, open-circuit fault exists between K; if there is positive and negative poles between the resistance is very small, and approaches at zero, the SCR internal short circuit fault exists between pole. Unidirectional SCR trigger characteristic test between A, K plus allowable forward voltage, two tubes are not turned on, this time between when the G, K will be formed with a positive voltage controlled current flowing V2 base SCR 2P4M, so the cycle until the two fully turned. When turned on, even if Ig = O, V2 has the base current due to SCR C106M, and much larger than Ig, and therefore the two tubes are still turned on. For conducting thyristor off, A, K forward voltage must be reduced to a certain value, or vice versa, or disconnected. The conductive properties of the SCR can be used to test multimeter resistance profile. For low-power thyristor can figure 3 (a) joins the circuit shown, SCR C106M, 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!