Celestron CGX-L Equatorial Mount and Tripod CGX-L Manual 5 Languages - Page 10
Precise Polar Alignment, Motion Range in Mount
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Precise Polar Alignment Celestron's All-Star Polar Alignment allows you to precisely polar align your mount without using Polaris or a polar axis finder. This software-assisted polar alignment allows you to choose a convenient star. Prerequisite: The CGX-L must first be aligned with a Two Star, One Star, or Solar System Align. 1. Select a suitable bright star from the NexStar hand control's database. Slew the telescope to the star. 2. Press the ALIGN button. Select "Polar Align" then "Align Mount" from the list. 3. The telescope will then re-slew to the alignment star and ask you to center it in the eyepiece in order to "sync" on the star. Press ENTER, center the star with the arrow keys, then press ALIGN to sync on the star. 4. P ress ENTER and the telescope will slew to the position that the star should be if it were accurately polar-aligned. At this point, do not use the hand control to center the star. 5. Use the mount's altitude and azimuth adjustments to center the star in the eyepiece. 6. Press the ALIGN button. The mount is now precisely polar aligned. You may proceed to use the mount without a new go to alignment. Motion Range in Mount Sofware Range The CGX-L employs software controlled limit sensors which detect when the mount has nearly reached its mechanical range limit. Once the mount reaches the sensor, the motor will decelerate to a stop and a "Limit Switch" warning message will appear. The mount will no longer slew in the direction of the limit switch until you reverse directions. Mechanical Range The CGX-L uses internal cabling so the mount is designed not to move more than a certain range. Both axes are limited by a hard stop built into the mount. This limited range can also help prevent unintentional interference between your telescope and the mount or tripod. If for any reason the mount exceeds the software limit switch (or if the clutch is unlocked and the mount is manually moved), the mount will halt at the hard stop. R.A. limit (Figure 9.1) allows you to track 20º past the meridian. If you leave the mount unattended while it's tracking, it will automatically stop before reaching the mechanical hard stop. Dec limit (Figure 9.2) contains enough slew range to reach any portion of the sky. 10 | ENGLISH Figure 9.1 One side of R.A. mechanical limit Figure 9.2 One side of DEC mechanical limit
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