iOptron CEM40 User Manual

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4. CEM40 Operation
In order to experience the full GOTO capability of GOTONOVA
®
technology it is very important to set
up the mount correctly before observation.
4.1. Set Up the Mount and Perform Polar Alignment
Assemble your mount according to Section 3. Please make sure the following:
1. Mount are setup and balanced.
2. Both UTC offset and DST are set correctly.
3. Longitude, latitude, date and time are all correct, with or without GPS module.
4. Polar alignment is performed.
5. Mount is set at Zero Position physically and registered in hand controller. The simplest way is to
perform MENU => “Zero Position” => “Search Zero Position”.
The Zero Position is the starting reference for GOTO. It is a position that the counterweight shaft pointing to
ground, OTA at the highest position with its axis parallel to the polar axis and the telescope pointing to the
Celestial Pole.
4.2. Go To a Celestial Object
Press MENU=> “Select and Slew” to perform the GOTO. Select a category, in this example “Solar
System”, and then select an object of interest, in this case “Moon”. Press ENTER and the telescope will
slew to the moon and automatically start tracking. If the target is not centered in your eyepiece, use the
arrow keys to center it. Then use MENU => “Sync to Target” for better performance.
Any object with a “ ” symbol next to it is currently below the horizon and the mount will not slew to
it.
4.3. Manual Operation of the Mount
You may use the arrow keys (►, ◄, ▼, and ▲) to point the telescope to celestial object. Center it
in the eyepiece. Use the number keys to change the slewing speed. Press the STOP/0 button to start
tracking.
4.4. Star Identification Function
The hand controller has a star identification function. After setting the correct local time and location
and completing polar alignment, slew the telescope to a bright star manually or using the GOTO function.
Press the Help (?) key to identify the star that the telescope is pointing to, as well as nearby bright stars if
there is any.
4.5. Power-Down Memorization
The CEM40 mount can memorize its R.A. and DEC positions if the mount power is lost during
operation, even during high speed slewing. After the power is back, just do a Select and Slew to the same
star when the power is lost. The mount will continue to track the star.

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