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>Sounds like what I was observing...I was fine with full input, but the lower
>I made the amplitude, the more inaccurate it was.  So why are the lower
>voltages not as accurately read?

Granularity of your ADC?
The ADC has larger error (percentage wise) as the signal gets smaller,
since it measures in fixed steps.

Otherwise, you may have a small DC offset.

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