iOptron CEM40 User Manual

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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:

iOptron CEM40 Specifications

General

Mount	Center-balanced Equatorial Mount (CEM)
Structure Material	All metal, CNC machined
Exterior finish	Anodized red/black
Level indicator	Level bubble
Dovetail saddle	8" Losmandy D & Vixen
Hand Controller	Go2Nova® HC, 212, 000 objects database, star recognition
Cable management	Yes
Tripod	LiteRoc 1.75" Stainless Steel(7kg), optional tri-pier
Max payload*	40 lb (18kg), exclude counterweight
Payload/Mount weight ratio	2.28:1
PEC	PPEC/Real time PEC
Tracking accuracy (PE)**	<±7.5 arcsec p-p (CEM40, CEM40G), or <0.3 arcsec RMS (CEM40EC)
Motor resolution	0.08 arc seconds
Slew speed	1×, 2×, 8×, 16×, 64×, 128×, 256×, 512×, MAX(~4.5°/sec)
Latitude adjustment range	0°~ 60° (special CW shaft mounting if <10° )
Azimuth adjustment range	± 6°
Operation temperature	-10°C ~ +40°C
Right Ascension worm wheel	Φ110mm, 216 teeth aluminum
Declination worm wheel	Φ110mm, 216 teeth aluminum
Counterweight shaft	Φ28X280 mm, Stainless Steel (1.2 kg)
Counterweight	11 lb (5 kg) X1
Motor drive	Precision stepper motor, 1.8º/128X micro-step
Meridian treatment	Stop (0-14° pass), auto flip
Power consumption	0.6A(Tracking), 0.9A(GOTO)
Power requirement	12V DC 5A
AC adapter	100V ~ 240V (included, indoor use only)
Polar Scope	Internal iPolarTM electronic polar scope
GPS	Yes
WIFI	External (optional)
Guiding scope/camera	Built in guiding scope and camera, iGuiderTM (CEM40G)
Autoguide port	ST-4
Communication port	USB Port (on mount)
PC computer control	Yes (ASCOM)
Warranty	Two year limited

Weight and Dimensions

Mount weight	17.4 lb (7.9kg)
Mount base size	Φ120 mm