The only way one can truly check anything that measures something is with a more accurate tool than the one that needs checking. So this begs the question, what is the resolution and range of this absolute encoder? Did you honestly think that we could come up with a method to check an absolute encoder without knowing anything about this encoder?
Silly me. This is probably what you are looking for.
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"Don't disturb my circles." translation of Archimedes last words
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