iOptron IEQ75-GTTM PEC Option, Set Up Tracking, Auto Guide, Dis R.A axis error, Polaris Position

5.5.3. Dis R.A axis error

This displays the celestial pole pointing error after two star or three star alignment. When the HC shows for example:

7.5" lower 4.3" east,

it means the polar axis of the mount is pointing lower and to the east. Pointing error is zero when the mount is powered on (unless you “Park Telescope” before powering off).

5.5.4. Polaris Position

This shows Polaris position in the polar scope and is used for Quick Polar Alignment.

5.6. PEC Option

iEQ75-GT uses automatic real time periodic error correction technique with a Renishaw high resolution optical encoder.

5.7. Set Up Tracking

You can set up tracking in the main menu by selecting “Set up tracking”. Then the user can select “Solar speed”, “Lunar speed”, “Sidereal speed” and “User defined speed”. For “User defined speed,” it can be adjusted from 0.9900X to 1.0100X of sidereal speed by pressing the ▲or ▼ button or number buttons.

5.8. Auto Guide

5.8.1. Set Guider Rate

This is an advanced function for autoguiding when a guiding camera is equipped either via an ST-4 guiding port or an ASCOM protocol. Before autoguiding, align the polar axis carefully. Press MENU and select Auto Guide and press ENTER. Select a proper guiding speed. The suppositional guiding speed can be selected from 0.10X to 1.00X. Follow the autoguiding software for detailed operation.

5.8.2. Set Guider Direction

The Guide Port iEQ75-GT equipped is capable to handle an ST-4 autoguiding camera with both straight and a reverse wired RJ-11 guiding cable. Select “Reverse” option in the “Auto Guide” function for an ST-4 camera with a reversed RJ-11 guiding cable, as shown in Figure 21.

Figure 21

26