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ArcTan in ECT with ACC24E3


JeffLowe
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If the interpolation is done in the Encoder Conversion Table with data from the ACC24E3 (principally to get the correction factors) What is the interpolation, 16384x or 4096x. Also, what facilities exist for discovering the correct values for Sin/Cos bias CoverSerror, and TanHalfPhi?
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When the software interpolation is done in the conversion table from an ACC-24E3, the interpolation factor is 16384 per line. We do not have automatic routines for determining the signal errors, but it would be quite simple to monitor the channel AdcEnc[0] and [1] registers for max and min values in a PLC program, then computing the sine and cosine offsets as the negative of the mean of max and min for([max+min]/2) each phase. The magnitude mismatch could be computed as the ratio of the span (max-min) of the two phases. Phase error would be a little trickier -- some just look at the Lissajous pattern on a scope.
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