SCR triac test. R * 1Ω resistance with a multimeter block, with a red, black and two pen were measured between any two pins positive and negative resistance, the result of which two readings of infinity. If a group of tens of ohms, the group of red and black two-pin connection table for the first anode A1 and the gate G, the other foot is the empty second anode A2. Determine A1, G pole, and then carefully measured A1, G pole between positive and negative resistance readings that measure relatively small black table pen connects to pin the first anode A1, take the red pen pin control electrode G. The black pen then identified a second anode A2, the red pen then the first anode A1, this time should not deflect the meter pointer, resistance is infinite. Then the short wires will A2, G extremely short moment SCR BTA412Y, to G pole with a positive trigger voltage, A2, A1 between the resistance of about 10 ohms. Then disconnect the A2, G between short wiring multimeter reading should remain around 10 ohms. Interchangeable red and black pen wiring, the red pen then the second anode A2, black pen then the first anode A1. Likewise meter pointer deflection should not occur, resistance is infinite. With short connection to A2, G again very short moment between, plus resistance to G very negative trigger voltage, A1, A2 is between about 10 ohms. Then disconnect the A2, G extremely short wiring between the multimeter reading should remain unchanged, maintained at about 10 ohms. Comply with the above rules, instructions and test triac undamaged three pins to determine the polarity is correct. Greater power to detect when the SCR requires a single 1.5V batteries in series multimeter black pen in order to improve the trigger voltage. Discrimination thyristor (SCR) SCR pin pin discrimination by the following methods: first with a multimeter to measure the resistance R * 1K block between tripod, the resistance of small feet were a control electrode and cathode, the remaining The kick for the anode. Then multimeter R * 10K block SCR, with fingers anode and the other foot, and do not let the feet touching SCR BTA225, black pen then the anode, the red pen then the rest of the foot, such as hands swing to the right SCR BTA216, explained the red pen connects the cathode, compared with the control electrode does not swing. SCR is a one-way thyristor controlled rectifier electronic components can be in effect by the external control signal is turned off, but once turned on, the external signal will not be able to make it off, only to be removed by or reducing the voltage across the load so that it is turned off. SCR is a four-way PN junction PNPN composed of three three-terminal semiconductor device compared with having a PN junction diode, the forward one-way thyristor controlled current-control; and has two PN junctions transistor compared difference is that SCR control current of no amplification. SCR BTA412Y, 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_42335835.html), for more information about the company.