Thyristor module detects what are the three terminals of A 1K2 A 1 K2. How to test them with thyristor tester or digital multimeter?

Inside the module are two single-phase thyristors!

K 1, A 1 and G 1 are the three poles of the thyristor; K2, A2 and G2 are three poles of another thyristor. However, these two thyristors have a connection point. Usually, the A pole of one thyristor is connected to the K pole of another thyristor.

G is the control electrode, which is connected to the pulse trigger circuit. A and K are positive and negative electrodes connected to the main circuit, but the trigger circuit also needs K pole. You can simply measure the resistance with a multimeter. The positive and negative probes of the anode and cathode are infinite. Trigger and cathode 10 to 300 ohms.

As a general application, there is no need to detect more than ten parameters of thyristor. If you are an instrument repairman, you don't have to worry about those parameters.

You can make your own suggested test equipment. The method is: find a "SCR power supply" and remove the SCR inside. The insulating plate is used as a bracket to simply fix the silicon controlled rectifier to be tested. Four wires (two thick wires and two thin wires) in the SCR power supply are led out and connected to the measured SCR. The load can be an "electric furnace". Next, you should know how to do it, and you can also judge whether it is good or bad.