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In Reply to: Yes and Yes(nt) posted by Russ57 on April 6, 2007 at 06:19:04:
What is the cause fo this? Bad power from electric company? I measured 11.5 volts DC with volt meter. What's the best way to eliminate this.
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They can be had on ebay for a few bucks or a hundred or two new.
nt
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> I measured 11.5 volts DC with volt meter.Most DC voltmeters can't make an accurate measurement in the presence of AC. The reading you took is probably in error. Before you assume its the line voltage that's at fault, try reversing the voltmeter leads to see if the polarity changes.
I get the same readings after changing VM leads.
That strongly suggests that your DC voltmeter is being fooled by the AC. If the meter was in fact accurately measuring DC, the polarity would have changed. A conclusive test will require a scope. DC will show up as an offset of the sinewave. An asymmetrically distorted waveform, while not technically DC, can produce similar results when the waveform is averaged.
nt
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