nec 2P4M way thyristor 2A, 400V, Dongguan, Zhongshan factory wholesale transistor triac belong NPNPN five devices, three electrodes are T1, T2, G. Because the device can double conduction, so the two gate electrodes in addition to the main terminal G collectively, with T1, T2, said, no longer divided into the anode or cathode. Characterized in that when G electrode with respect to the pole and T2 T1, the voltages are both positive, T2 is the anode, T1 is a cathode. On the contrary, when the G electrode with respect to the pole and T2 are negative when the voltage of T1, T1 becomes the anode, T2 is a cathode. Since the triac, the reverse characteristic curve has symmetry, so that it can be turned in either direction. SCR 1, single, triac distinction: the first one of the two measuring pole, if positive and negative test pointer not moving (R × 1 block), may be A, K or G, A pole (one-way SCR) may also be T2, T1 or T2, G pole (for triac). If there have been a measure indicative of tens to hundreds of Europe, it certainly is way thyristor. And a red pen for the connected K-pole, black pen then for G pole, namely A remaining pole. If the positive and negative test instructions are tens to hundreds of Europe, certainly for the triac. Then dial knob to R × 1 or R × 10 block retest, during which time the resistance must be slightly larger, slightly larger than a red pen is connected to G pole, black pen pole connected to T1, T2 remaining is extremely . 2, the function is not the same: the knob dial to R × 1 block, about 1 ~ 6A way thyristor, red pen then K pole, black pen together turned G, A pole, while adhering to the black pen without departing from the A pole Disconnect the G under extreme conditions, the pointer should indicate dozens of Europe to one hundred in Europe, this time the SCR has been triggered, and the trigger voltage is low (or trigger current is small). A pole momentary disconnect and then on again SCR C106M, position the pointer should be returned ∞, then marked SCR outstanding. About 1 ~ 6A triac, red pen then T1 pole, black pen together pick G, T2 pole SCR 2P6M, disconnect G in ensuring black pen without departing from the premise T2 pole pole, the pointer should be instructed to dozens to more than one hundred Euro (depending on the current size of the SCR, the manufacturers are not the same but different). Then swap the two pens, repeat the process measured once, pointer even slightly larger than the last time to a few dozen in Europe, it marked an outstanding SCR SCR, and the trigger voltage (or current) is small. If you insist on turning A pole or pole disconnect G T2 pole position pointer immediately return ∞, then clarify the SCR trigger current is too large or damaged. Figure 2 approach can further measure SCR C106G, on a one-way SCR, closing the switch K, lights should be lit, disconnect the lamp is still interest K off, or to clarify SCR damage. About triac, closing the switch K, lights should be lit, disconnect K, lights should be quenched. Then reverse battery, repeat the process, the outcome should be the same, it is good to clarify. Otherwise stated that the equipment has been damaged. SCR T405-800T, 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! You can also access (www.dgmydz.com/supply_details_41891875.html), for more information about the company.