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.
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.
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.
@@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 ?
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 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
This is the only method that works for microwave diode testing by DMM.
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.
We promise this test method will not hurt the diode :)
What if your multimeter is powered by a 9V battery?
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.
Thank you, done well!!
you're welcome!!
voltage is not flowing, it's the current that's flowing.
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.
Is it normal to have 0.014v on reverse?
Yes
i did this but volts flow through was only 2 volts does this meant that the diode is bad?
We would suggest getting a brand new battery and checking it again. Also, make sure your connections are good.
@@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 ?
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
If you have an Insulation tester its better just using that.
@@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