iOptron MiniTower Pro instruction manual Align, PEC Option

6.5.11. Update Firmware

Firmware updating using iOptron Downloader through USB port on hand controller. (Refer to Appendix E.)

6.5.12. Set gear ratio

Reserved for future products.

6.5.13. Set Language

Select hand controller language.

6.6. Align

This function is used for aligning the telescope. In addition to “Easy One Star Align,” the system also provides “One Star Align” and “Two Star Align” for Alt/Azi mount. “Three Star Align” is only supported by EQ mode.

6.6.1. One Star Align

From the main menu select “Align”. Select “One Star Align”. Use ▲ and ▼ buttons to select a star and press ENTER. A list of align planets or stars that are above the horizon is computed based on your local time and location. Use arrow buttons to move the telescope and center the star in your eyepiece. You can use the number buttons to change the slew speed.

Press ENTER when finished. If your setup is leveled well, one star alignment should be sufficient for good GOTO accuracy. To increase the accuracy you may choose to do two star alignment.

second star. If the star you choose is too close to the first one, the system will let you choose another one. When you are aligned with the second star, two star alignment is finished. You can reject the suggested star if it is blocked by the tree or behind the house.

“Two Star Align” results will be overridden if “One Star Align” or “Sync. to Target” is performed after “Two Star Align.”

6.6.3. Three-Star Align

It will increase the accuracy even higher and requires an even wider view of the sky. This basically asks you to choose a third star to align after two-star align. Three star alignment is not available for Alt/Azi mode.

6.6.4. Dis R.A axis error

This only works for EQ mode. This displays the celestial pole point error. Point error is zero when you power on the mount (unless you “Park Telescope” before powering off.

6.6.5. Test Anti-backlash

This command tests the backlashes in both R.A. and DEC. The saved numbers will show in “Set Anti-backlash” menu. However, if no high accuracy is needed or your equatorial mount is not a high accuracy unit (i.e. the worm gear has different clearance in different positions) you can omit this procedure.

This command only works for EQ mode.

6.6.2. Two Star Align

Two star alignment will increase the GOTO accuracy of the mount. It is suggested to do two star alignment after one star alignment. Two star alignment requires a wider view of the sky, since the two align stars need to be far apart. Select “Two Star Align” in the Align menu. When you finish the first star, the system will prompt you to choose the

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6.6.6. Polaris Position

This shows Polaris position.

6.7. PEC Option

Periodic Error Correction (PEC) is not supported in Alt/Azi mode.