Testing a microwave diode with a digital meter

[@BuildItFixItDIY]

I also came up with the idea to do this to test my microwave diode when I suspected that the diodes I was getting and testing before installation couldn't ALL be bad could they?!?! I then happened to read on an amazon seller's page, a description of how a typical digital MM won't work, so I thought hey, why not boost things by making a litle circuit with a 9V and test for presence of voltage instead of the diode test setting. However a caution for all. Another video on this platform recommends a 240ohm resistor in the test circuit since the diodes can't necessary handle much current. However I had watched the video only after I had done the test similar to the video above, and there was no damage to the diode. I feel that one is probably safe doing the method that I usedand shown in this video since the MM itself doesn't draw hardly any, so it is unlikely that it will harm the diode.

[@fredsapplianceacademy]

We promise this test method will not hurt the diode :)

[@nld-bl5ct]

Thank you, done well!!

[@fredsapplianceacademy]

you're welcome!!

[@whzhu7730]

This is the only method that works for microwave diode testing by DMM.

[@MarshaSiner]

What if your multimeter is powered by a 9V battery?

[@fredsapplianceacademy]

Set it to ohms and test it's voltage output with another meter. If it is outputting 9vdc it will work. Most digital meters only output 3-4vdc on the ohms setting which is not enough to test the diode.

[@wasmochtensietrinken]

voltage is not flowing, it's the current that's flowing.

[@fredsapplianceacademy]

True. Sorry for any confusion. If it helps remember you can have voltage without current but you cannot have current without voltage. So when I said voltage is flowing I did in fact mean current.

[@diamous]

Is it normal to have 0.014v on reverse?

[@fredsapplianceacademy]

Yes

[@rickyrick7866]

i did this but volts flow through was only 2 volts does this meant that the diode is bad?

[@fredsapplianceacademy]

We would suggest getting a brand new battery and checking it again. Also, make sure your connections are good.

[@cmarlowe1]

@@fredsapplianceacademy yea I see only 3.3 volts in one way on my diode using a 9 volt battery which tests as 9.01 volts. Wonder if a poor flowing diode will still cause my microwave to hum ?

[@fredsapplianceacademy]

They are not expensive. If it is your personal micro order a diode on amazon and give it a shot. Make sure you check all other high side components and inspect the transformer for any cracked welds for separating plates. @@cmarlowe1

[@cameronbrindley6180]

If you have an Insulation tester its better just using that.

[@fredsapplianceacademy]

@@cameronbrindley6180 a 9 volt battery costs $1.00. an insulation tester can run around $7,000! www.fluke.com/en-us/product/electrical-testing/insulation-testers/fluke-1550c-kit