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 the G pole SCR BTA216, black pen connects to T1 pole, The remaining is T2 pole. 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, the pointer should be returned ∞ position, then marked SCR outstanding. About 1 ~ 6A triac SCR, red pen then T1 pole, black pen together pick G, T2 pole SCR BTA140, in ensuring that the black pen off without departing from the premise G T2 pole pole, the pointer should indicate for tens 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 SCR outstanding, 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 can be further measured way, 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 thyristor BTA412Y, 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. The equipment has been damaged or clarify the full name of the thyristor SCR Thyristors (also known as SCR, abbreviation SCR):. Is a power semiconductor devices. It has a large capacity, high efficiency, good controllability, long life and many of the advantages of small size, is weak and charged with handling a bridge between strong electricity. From the energy point of departure, hailed as the new electric power electronics skills skills. China's power usage is low, according to the national production of energy yield calculation, China is 4.98 times that of France, Japan, 4.43 times, and thus to the thyristor (SCR) as the center of the increasing use of electrical control equipment is useful for saving China An important measure of electrical energy. SCR BTA204, 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_39593060.html), for more information about the company.