iOptron CEM120 - Adjusting Altitude and Installing Counterweights

16
Remove the CW shaft from the package and threaded it onto the CW shaft mounting house. DO
NOT release the RA Axle Lock before the CW shaft is fully threaded in. The CW shaft is designed to
balance the mount head weight.
DO NOT rock the counterweight shaft rigorously. It may damage the worm system.
STEP 3. Adjust Altitude
This step requires you to know the latitude of your current location. This can be found from your
8407+ hand controller after the embedded GPS receives the signal from the satellites. It can also be
easily found on the Internet, using a GPS satellite-navigation system, or a GPS capable cell phone.
You will have to change this latitude setting every time you significantly change your night sky viewing
location. Note that this setting directly affects the mount’s GOTO accuracy.
Figure 13. Setting the latitude
Figure 14. Latitude Adjustment Knob
Slightly loosen the Altitude Locking Clamps about a quarter (1/4) turn with a 5mm Allen wrench,
on both side of the mount. Turn the Altitude Adjustment Knob until the arrow points to your current
latitude on the Latitude Scale, as shown in Figure 13. Tighten the Altitude Locking Clamps when done.
The altitude adjustment employs worm gear system and can be adjusted precisely when turn in
one direction. The fine adjustment is 0.5 arcmin.
The mount latitude adjustment range is from 0° to 68°. For those low latitude places between
0° to 10°, special low latitude CWs (#7326LL) are needed. Please specify when order.
STEP 4. Install the Counterweight(s) and Telescope
Before installing the Counterweight(s), make sure that mount is at Zero Position, i.e., CW shaft
is pointing to ground. Both R.A. and DEC Axle Locking Knobs are at the locking position (refer to
Illustration A on page 5).
Remove the CW Safety Cap at the end of CW Shaft. Guide the CW over the shaft. Tighten the
CW Locking Screw to hold the CW in place. Place the Safety Cap back onto the shaft.
WARNING: The mount should always be kept in the zero position while it is being loaded
with CWs and payload.
Altitudelocking
clamp
Altitude
Adjustmentknob