[ACP-570]  Unguided dither with unsync-able scopes and pointing errors
Type Bug
Priority High
Severity Major
Component AcquireSupport library
Fixed In Version [6.0] 6.0
Versions Affected [5.1.11] 5.1 Hot Fix 11
Severity Closed
Resolution Complete
Reported By Bob Denny
Resources Bob Denny
Start Date 1/17/2011

Description 
Reported by Steve Cullen. If there is a "large" pointing error, and if you are using unguided dithering, the first dither slew removes the pointing correction jog, returning the scope to the uncorrected position plus dither! It looks like the pointing correction never happened.

Comments
1/18/2011 9:27:34 AM   Bob Denny 

 

  SVN Comment
 

 

  Author
  rbdenny
 

 

  Repository
  svn+ssh://rbdenny@a2_svn_dc3/home/rbdenny/svn/astro/acp
 

 

  SVN Revision
  220
 

 

  Affected files
  /trunk/ACP Help/relnotes.htm (Modified)
/trunk/CorrectedTelescope.cls (Modified)

 

 

  Check-in comment
  In ACP.CorrectedTelescope, force a coordinate poll immediately on completion of a slew.
GEM:570
1/18/2011 9:03:19 AM   Bob Denny 
Holy mackerel! The pointing correction jog slew completes, the unguided dither uses the scope's coordinates as a starting point, but the scope's coordinates may not yet have been polled! If not, the dither slew goes back to the uncorrected coordinates, reversing out the jog-correction!






Workaround: Increase slew settle time to 7 or more sec (for slow polling 5 sec).







Real solution: Force a coordinate poll immediately upon completion of a slew.