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, so the cycle until the two fully turned. When turned on, even if Ig = O, V2 has the base current due to SCR T405-800T, 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) coupling circuits shown way thyristor trigger characteristic test for larger power SCR turn-on voltage drop due to a larger holding current difficult to maintain, causing guide poor state, and you should connected in series thyristor anode (A) on a dry section of SCR T405-600T, as shown in Figure 3 (b) to test the circuit shown in SCR 2P4M, in order to avoid false positives . For high-power SCR should be on the circuit of Figure 3 (b) of the previous section and then string batteries, so test the effect is obvious. 10A with an SCR 100A Figure 3 (b) connecting the circuit shown in SCR, more than a single test 100A; generally in the following way thyristor 10A test with Figure 3 (a) coupling circuits shown to the SCR should Figure 3 (b) and then a dry battery string. On the basis of the test on the way thyristor, thyristor for other types, according to its basic structure, can also be used to test multimeter SCR T405-600T, SCR, are fertile electrons from Dongguan City is fertile Electronic Technology Limited. 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!