The steps required for testing of a diode rectifier are as
probe to the anode of the diode
voltage drop (rectifier diode) of around 0.6 volts
original reading indicating that the diode is a good one
leaky or faulty while a 0000 reading means a short
There are other methods, but this is about the simplest method. Depending on the type of multimeter you are using. Other methods that can be used is the resistance test method ie testing the resistance in the forward and reverse biased manner.
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written by Anthony