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Here are some graphs showing the periodic error in my mount. I used K3CCDTools to record the PE over a period of 1500 seconds (approx 25 minutes) on 4 consecutive runs on the same evening, with the same set up, at a focal length of 2160mm. I think the worm period on the EM200 is 480 seconds?
The runs sampled the star position at 1, 2, 3 and 5 second intervals and these are the results from importing the K3 logs into Excel, RA data only. You can easily see the effects of seeing.
The graphs are “polluted” by the effects of declination drift due to less than perfect polar alignment.
Cheers
Dennis
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