How to test high voltage diode.
Usually multimeter can only output around three volts which is fine for testing regular diodes, but that is not enough to test high voltage diodes and we will need a power source to help us, it can be a bench power supply if you have one or it can be a simple battery.
CAUTION!!! It’s not a battery in a microwave - it’s a high voltage device and it can kill you in seconds, if you don’t know what you’re doing - DON‘T DO, better ask someone else!
Testing is pretty easy.
First we should see the current flow through the diode from anode to cathode and we connect anode to the positive terminal of the battery and then we connect multimeter common probe to the negative terminal of the battery and then multimeter's positive probe to the cathode.
Now here we should see voltage through the diode minus voltage drop on the diode.
Then we flip the diode and check again, and now there should be no voltage.
Also if we see voltage in both directions - diode is shorted and if we see no voltage in both directions - diode is open. In both cases the diode is bad.
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