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What is the detection method of rectifier diode?

First of all, remove all the rectifier diodes in the rectifier, and measure the two lead wires of the rectifier diode with the 100×R or 1000×R ohm file of the multimeter (the head and tail are adjusted once).

If the resistance value of the two measurements is very different, for example, the resistance value is as high as tens of thousands of Ω, and the resistance value is only a few hundred Ω or even smaller, the diode is good (except for the diode with soft breakdown).

If the resistance values measured twice are almost equal, and the resistance values are small, it means that the diode has been damaged by breakdown and cannot be used.