[ARC5] Diode Mystery

[Robert Eleazer]

The other day I installed a rectifier diode in the 12VDC B+ line of a radio for reverse current protection.  When I used my trusty Simpson DVOM to check proper continuity I was shocked to see that the voltage read something like 30VDC.  At first I thought that the output voltage meter on the bench power supply I was using was wildly off, but checking it at the output terminals showed that it was the correct 12V.  But on the other side of the diode it read about 30VDC.

I used a different DVOM and it read the proper voltage on both sides of the diode.

Anyone have any idea what could have happened here?  Is it possible the diode created some noise that confused the Simpson DVOM?  If so, should I be concerned about that noise getting into the radio?

Thanks!

Wayne
WB5WSV    

      

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