How to use multimeter testing SCR

 Unidirectional and bidirectional silicon controlled rectifier thyristor SCR points two kinds,are three electrodes.One-way thyristor cathode (K) and anode (A) and control (G).Bidirectional thyristor is equivalent to two single SCR reverse in parallel.Is one of the one-way silicon anode and cathode in the other side,said the terminal T2,one of the one-way silicon cathode and anode is connected to ac induction motor the other,says the terminal T2,the rest is for control (G).1,single,bidirectional thyristor discriminant: first as A two pole,if it is,but test Pointers are not moving (R x 1 block),may be A,K or G,A unidirectional thyristor (for) can also be extremely T2 and T1 or T2,G motor run capacitor (for bidirectional thyristor).If there are instructions for a single measurement dozens to hundreds of Europe,will be as one-way thyristor.


For K and red pen receive pole,the black pen for G pole,the rest is A pole.If the positive and reverse test instructions are dozens to hundreds of Europe,will be as the bidirectional thyristor.Turn the knob to R * 1 or R * 10 survey,in which www.facebook.com/dongfeng.motor there will be a little older resistance,a red pen is larger for G pole,black pen that provides for the T1,the rest is T2.2,the difference of performance: turn the knob to R x 1 block,for 1 ~ 6 A one-way thyristor,K very red,black pen at the same time through to G,A pole,in keeping the black pen is not out of electrical motor A very great condition disconnect G,pointer should indicate dozens of Europe to euro one hundred,has triggered thyristor at this time,and low trigger voltage (small or trigger current).And then instantaneous disconnect A very connected,pointer should be returned to the up position,suggests that SCR is good.