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Old 20th July 2008, 10:28 PM   #11
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In case you're wondering, here are the distortion residuals for an AP2022 -- the display is averaged 32X and the sweep time is 50 seconds:

Click the image to open in full size.

The fundamental is 10kHz -- if you take the sqrt of the sum of the squares it is within a gnat's eyelash of the THD level shown on the AP.
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Old 21st July 2008, 01:21 AM   #12
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are you operating that analyzer in linear mode? shouldn't your readout be in db/div and not uV/div? just wondering....
i usually use an analyzer in log mode.
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Old 21st July 2008, 01:42 AM   #13
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Yes, it is in linear mode -- there's too much information in log mode.

I love this HP3577 -- and have been programming via the HP-IB of late.
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