R of usable multimeter × 1k or R × Measure the forward and reverse resistance between any two poles at 100 gears. If a pair of poles is found to have a low resistance value (100 Ω - lk Ω), then the black lead is connected to the control pole, the red lead is connected to the cathode, and the other pole is connected to the anode. The thyristor has a total of three PN junctions, and we can determine its quality by measuring the forward and reverse resistance of the PN junction. When measuring the resistance between the control electrode (G) and the cathode (C), if both the forward and reverse resistances are zero or infinite, it indicates a short circuit or open circuit in the control electrode. When measuring the resistance between the control electrode (G) and the anode (A), both the forward and reverse resistance readings should be large. When measuring the resistance between the anode (A) and cathode (C), both the forward and reverse resistances should be large
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