iOptron CEM40 - HC Heating Switch; Set Maximum Slew Rate; Set RA Guiding; Reset All Settings

29
Warning: Use at your own risk when you let the CW shaft point up!
5.4.10. HC Heating Switch
Turn on/off the controller LCD back heater. When “Heating ON” is selected, the heater will be
automatically turned on when the ambient temperature reaches 0°C (32°F) and shut off at 10°C.
5.4.11. Set Maximum Slew Rate
This function will help the mount to slew properly under low temperature or extreme payload
condition (extra long or large diameter scope). Press MENU => “Settings” => “Set Maximum Slew Rate,.”
You can select one of three slew rates. The default is MAX.
5.4.12. Set RA Guiding
The function is for the EC version mount only. You can turn off R.A. guiding by selecting “Inhibit
R.A. Guiding” to stop sending the RA guiding signal to the mount, or turn the R.A. guiding on by selecting
“Allow RA Guiding” to allow the mount to receive guiding corrections from the guiding software. The power
on default setting is “Allow RA Guiding”.
5.4.13. Reset All Settings
Reset all the settings to factory default.
5.4.14. Language
Select one of supported menu languages. Currently it has English and Chinese.
5.5. Electric Focuser
This function controls an iOptron electric focuser #8451 or #8452. It does not work for #8453 iEAF.
5.6. PEC Option
This function only works for the CEM40/CEM40G mount, not for a mount with high precision
encoder.
5.6.1. PEC Playback
You can turn “PEC Playback On” to improve tracking accuracy which is especially useful for long
exposure astrophotography. The default status is “PEC Playback Off” when the mount is turned on.
5.6.2. 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 worm gear and is especially useful when doing astrophotography without
autoguiding. Because the variations are regular, it is possible to record the corrections required to cancel
out the worm gear variations and to play them back to correct the periodic error caused by the variations.
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: