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Old 08-28-2017, 07:57 AM   #14
diver dave
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City: Fairport, NY and Palm Coast, FL
Country: United States
Join Date: Jan 2017
Posts: 1,767
CHarger hum. It might be possible for you to measure this offensive signal on your DC bus with a DMM in AC mode. THis is why a previous posted mentioned adding water to his house battery. If the plates were not covered, and then you added water, it would lower the impedance of the battery and tend to reduce this noise voltage.
Even better to use what I have, a self powered digital oscilloscope.
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