5.4.11. Set RA Guiding (HEM27EC Only)
You can turn off R.A. guiding by selecting “Filter R.A. Guiding” to allow the high precision encoder
to correct the tracking error, or turn the R.A. guiding on by selecting “Allow RA Guiding” to allow the mount
to receive guiding corrections from the autoguiding software.
5.4.12. Language
Select one of supported menu languages. Currently it has English and Chinese.
5.4.13. Enable CW Up Position
This setting will allow the CW moving to an up position. The upward angle limit is same as the
meridian flipping setting, or 20 degree at maximum. When this set is enabled, the mount will goto pass the
meridian if an object is close to the meridian, within the angle limit. There will be no meridian flip when pass
the meridian.
5.5. PEC Option
This function only works for the HEM27/HEM27A mount.
5.5.1. PEC Playback
You can turn “PEC Playback On” to improve tracking accuracy. The default status is “PEC
Playback Off” when the mount is turned on.
5.5.2. Record PEC
All equatorial mounts have a small variation in the worm gears which may be corrected by using
Period Error Correction or PEC. PEC is a system which improves the tracking accuracy of the mount by
compensating for variations in the strain wave gear. Unlike a conventional telescope mount with worm
gears, PEC on strain wave gear might be less efficient and PEC algorithm in practice is much more difficult
since the PE curve varies from point to point and condition to condition.
In order to use the PEC function, the Go2Nova
®
hand controller first needs to record the periodic
error. The periodic error of the worm gear drive will be used to correct periodic error.
To use the PEC function:
1. Setup the mount with a telescope in autoguiding configuration by connecting a guiding camera via
the mount’s Guide Port or using the ASCOM protocol;
2. Select “MENU=>Settings => Set Guiding Rates”. Set a guiding speed from 0.10X to 0.90X. The
default setting is 0.50X;
3. Then press the BACK button and select “PEC Option” from the menu. Use the ▲ and ▼ scroll
buttons to display the “Record PEC” option and press ENTER to start recording the periodic error.
4. It takes the strain wave gear 360 seconds to make one period. The PEC value will be
permanently stored inside PEC chip on R.A. motor drive until a new data are recorded.
5. If you want to re-record the periodic error, select “Record PEC” and repeat the recording
processes again. The previously recorded information will be replaced with the current information.
5.5.3. PEC Data Integrity
This function will check the recorded PEC data integrity.
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