Periodic Error
Below is an analysis of my MI-250's periodic error taken on 4/27/2008. This was done using PEMPro which is nice because it creates a curve from the individual data points and compensates for drift. The result is an accurate analysis of the mount's true periodic error.
PEMPro can use the curve to program mounts that have Periodic Error Correction (PEC), which the MI-250's Gemini Level 4 electronics supports. Below is the resulting periodic error with PEC turned on. Quite an improvement.
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