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Periodic Error Correction (PEC) Training
(Polar Alignment and RA Drive Only)
If you wish to improve the tracking performance
on your telescope, fi rst, perform the train the drive
procedure (see page 57). Then use the Periodic
Error Correction (PEC)/Train menu option to remove
the slight perturbations from center that occur due to
the mechanical nature of a telescope. To perform this
procedure, you need to use a high-power reticle, such
as the 9mm reticle (see OPTIONAL ACCESSORIES,
page 52).
Important Note: In order for the Smart Drive
training to operate and be updated properly,
you must “park” the telescope (see PARK
SCOPE, page 41) when fi nished with your
observing session.
PEC Train Menu Option
To perform the procedure on the RA axis, pick a bright
star in the South that has minimal movement and is
about 30° above the horizon (Note: If in the Southern
hemisphere, pick a star in the North that is about 30°
above the horizon).
Important Note: The Train option overwrites any
previous PEC data.
1. Select “PEC Train” from the Smart Drive
menu (in the “Setup: Telescope” menu) and
press ENTER.
2. Look through the reticle. Use the Arrow keys to
keep the star centered in the reticle cross-hairs.
AudioStar displays a count of the 150 positions
of the worm gear. When the count reaches 150,
one cycle is complete. A full cycle takes about
9.5 minutes.
3. Press MODE to exit.
PEC Update Menu Option
PEC Update does not overwrite the data, but updates
the training using information gathered from both
the last and the current training sessions. Press the
MODE key to exit from this option. If you wish to further
refi ne your training, select this menu again and repeat
the procedure.
PEC Erase Menu Option
Select this option to erase all PEC training data.
PEC On and Off Menu Options
Select “On” when you want the telescope to use the
training information. Select “Off” when you do not want
for the telescope to use the training information.
AudioStar #497 HANDBOX
Appendix D: Equatorial ( Polar Alignment)
64