Quote:
Originally Posted by rogerg
Leon,
>snip
I don't understand why Gama says not to use a star - I would suggest using a medium brightness star for PEC training. Providing it's not variable or something else strange like that.
Roger.
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We may be talking of two different tuning parameters here?
I think Gama is referring to “
backlash compensation” whereas you are writing about “
PEC training”.
For reducing
backlash, you align on a stationary object and then press the 4 motor movement keys to see if there is too much lag before the ‘scope moves after having pressed the button. Or, the ‘scope may take off too quickly meaning that the gears could be too tightly meshed?
PEC training is where you follow the (hopefully small and smooth) wandering of a star as the mount tracks and you keep bringing the star back to the cross hairs. The mount remembers all the minor presses you make of the motor movement keys after a complete revolution of the worm and then plays this back to compensate for the wandering or Periodic Error.
Cheers
Dennis
PS - EDIT:
In my Vixen Skysensor 2000 you can set the backlash in software from a numerical value of 0 to 250 (I think?).
- A value of 0 means that there is no backlash so the software drives the motors without compensating for any potential delay.
- A value of 250 would suggest there is a lot of backlash or slack to take up, so the motors drive to take up this slack and then when the gears mesh and begin to drive the ‘scope, the system knows that real movement of the ‘scope should now be taking pace, rather than gears spinning to take up the backlash or slack.
The SS2K ships with RA and DEC values of 100 as default.