iOptron CEM70 Instruction Manual page 14

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 15. Setting the latitude
Slightly loosen the Altitude Locking Clamps about a quarter (1/4) turn with the 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 15. 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. Use the wrench as a lever for better control of the knob.
STEP 4. Install the Counterweight (CW) Shaft
The CW shaft system is a two-part configuration. It comes with preinstalled top part of the shaft. Just
simply thread the CW shaft onto it.
At very low-latitudes (<10°), you may tilt the CW shaft to accommodate it. There are three screws on
CEM70 CW Mounting Housing: A Shaft Locking Screw, a Shaft Position Screw on the other side, and a
Low-Latitude Set Screw, as shown in Figure 18.
Loosen the Shaft Position Screw first. Then loosen Shaft Locking Screw. Turn the Low Latitude
Position Screw into the CW Mounting Housing to tilt the CW shaft so that the CW does not foul your
tripod/pier (Figure 19). Then tighten the CW Shaft Positioning Screw and Shaft Locking Screw.
Altitude
Adjustment knob
Altitude locking
clamp
Figure 17. Install CW shaft
Figure 16. Latitude Adjustment Knob
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