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checking for a bad diode

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  • #16
    Originally posted by EETStudent View Post
    Yeh I got it all figured. Like i mentioned, I was trying to rearrange the grounding schemes and by the end of it all I had forgotten to assign a ground to the high voltage center tap from the PT. THAT was a problem I had never encountered in my young tech career. Like you guys said, I usually work from the outside in, checking the B+ and then grounding, bias and loose components, shorts to ground, etc...

    As for my meter, Ive got a really good one my dad got from work. Its a Fluke 175 true rms multimeter. A fairly high end meter from what Ive researched. The ungrounded CT must have been causing the high dc voltage before the rectifiers. Maybe half of the AC flowed forwardly through one diode, then reversely through the other and the dc wound up at the ends(or beginnings) of each diode.
    an analog meter is still better for checking diodes, you can see leakage that will never show up on a digital meter. but I'm glad it was just the CT. (that was strange)

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