Gday Sam
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2 arc sec peak to peak is interesting, and as an encoder problem, given that the encoders are in house, it may be something simple for them to fix.
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Based on the comments by orlyandico ( the expert on this ),
it may not be so simple, as he hit the same problem
Its a 2-3 arcsec sinusoid at about 5 seconds per wave
so hard to guide out
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(trying to find the original thread on CN now)
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ref
http://www.cloudynights.com/topic/io...essions?page=6
ref page 6 for a plot of the encoder fundamental in the FFT plot
and on page 7 is a plot of his RA data.
Superbly repeatable, but not easily fixable.
I guess it will come down to when does the ripple get bigger than seeing or the resolution of the loaded scope.
Ie at what point will it be noticeable in subs???
Andrew