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Absolute Polarity?
----There is definitely a major difference between absolute polarity and DC offset....Although you will sporadically see a difference between the size of the waveform above and below the line, in my experience it is rare to see this as a constant factor and still have the wave correctly crossing the zero point at the line, which is what DC offset is all about.
If there is no DC offset, you will see a very quiet or silent signal intersect exactly with the zero line when you greatly magnify the waveform resolution. If there is a DC offset, then this signal will sit above or below the line....This is the sure-fire test.
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