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I felt the need to prove your point,
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I'm not sure I understand what you're attempting to prove here? Forgetting about the fact that the digital out appears to be creating an oscillation on loopback, you can see that the low frequency response of the analog and digital (when compared are different - no surprise). This results in inaccuracies. Not huge ones, but it's there.
As I said before, you don't need to prove anything here. The digital will not be as accurate as the analog, since the analog allows for a proper calibration file. If you can live with small inaccuracies, go ahead and use the digital output. No big deal.
burcek