View Single Post
  #579  
Old 13-04-2018, 12:47 PM
erick's Avatar
erick (Eric)
Starcatcher

erick is offline
 
Join Date: Dec 2006
Location: Gerringong
Posts: 8,532
Encoder direction sense, Graham?

This from Gary's FAQs on his website:

How do I establish the encoder direction senses for my Dob?

To check the SETUP ALT STEPS sign, point the Optical Tube Assembly (OTA) to the vertical and DIAL up MODE FIX ALT REF, ALT REF=+90, AUTO ADJUST OFF and then press ENTER.

Now DIAL up MODE ENCODER. The right-hand displayed value should be close to +90 degrees.

Now push the OTA downward in Altitude toward the horizon. The right-hand displayed value should decrease, +89, +88, ... +3, +2, +1, 0 as you go from the zenith toward the horizon. If not, reverse the SETUP ALT STEPS sign and repeat the test.

To check the SETUP AZ STEPS sign, rotate the scope in Azimuth clockwise whilst observing the left-hand displayed value in MODE ENCODER. The Az angle should increase. If it does not, reverse the SETUP AZ STEPS sign.
Reply With Quote