Handleiding Celestron CGEM II (pagina 10 van 161) (Duits, Engels, Frans, Italiaans, Spaans)

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10 | ENGLISH

Balancing the Mount in R.A.

To eliminate undue stress on the mount, the telescope

should be properly balanced around the polar axis. Proper

balancing is crucial for accurate tracking. To balance the

mount:

1. Verify that the telescope is securely attached to the

telescope mounting platform.

2. Loosen the R.A. lock lever and position the telescope

off to one side of the mount. The counterweight bar will

extend horizontally on the opposite side of the mount.

3. Release the telescope — GRADUALLY — to see which

way the telescope “rolls.”

4. Loosen the set screws on the side of the counterweight,

so it can be moved the length of the counterweight bar.

5. Move the counterweight to a point where it balances the

telescope (i.e., the telescope remains stationary when

the R.A. clutch knobs are loose).

6. Tighten the screw on the counterweight to hold it in

place.

Tip: While the above instructions describe a perfect balance

arrangement, there should be a SLIGHT imbalance to

ensure the best possible tracking. When the scope is

on the west side of the mount the counterweight should

be slightly imbalanced to the counterweight bar side.

And when the tube is on the east side of the mount

there should be a slight imbalance toward the telescope

side. This is done so that the worm gear is pushing

against a slight load. The amount of the imbalance

is very slight. When taking astroimages, this balance

process can be done for the speciﬁc area at which

the telescope is pointing to further optimize tracking

accuracy.

Balancing the Mount in DEC

Although the mount does not track in declination, the telescope

should also be balanced in this axis to prevent any sudden

motions when the DEC lock lever is loose. To balance the

telescope in DEC:

1. Loosen the R.A. clutch lock lever and rotate the telescope

so that it is on one side of the mount (i.e., as described in

the previous section on “Balancing the Mount in R.A.”).

2. Tighten the R.A. lock lever to hold the telescope in place.

3. Loosen the DEC clutch lock lever and rotate the

telescope until the tube is parallel to the ground.

4. Release the tube — GRADUALLY — to see which way

it rotates around the declination axis. DO NOT LET

GO OF THE TELESCOPE TUBE COMPLETELY!

5. Slightly loosen the knobs that hold the telescope to

the mounting platform and slide the telescope either

forward or backward until it remains stationary when the

DEC clutch is loose. Do NOT let go of the telescope

tube while the knob on the mounting platform is loose.

It may be necessary to rotate the telescope so that the

counterweight bar is pointing down before loosening the

mounting platform screw.

6. Tighten the knobs on the telescope mounting platform

to hold the telescope in place.

Like R.A. balance, these are general balance instructions

and will reduce undue stress on the mount. When taking

astroimages, this balance process should be done for the

speciﬁc area at which the telescope is pointing.

Adjusting the Mount

In order for a motor drive to track accurately, the telescope’s

axis of rotation must be parallel to the Earth’s axis of rotation,

a process known as polar alignment. Polar alignment is

achieved NOT by moving the telescope in R.A. or DEC but

by adjusting the mount vertically, which is called altitude and

horizontally, which is called azimuth. This section simply

covers the correct movement of the telescope during

the polar alignment process. The actual process of polar

alignment, or making the telescope’s axis of rotation parallel

to the Earth’s, is described later in this manual in the section

on “Polar Alignment.”

Adjusting the Mount in Altitude

• To increase the latitude of the polar axis, tighten the rear

latitude adjustment screw and loosen the front screw.

• To decrease the latitude of the polar axis, tighten the front

latitude adjustment screw (located below the counter-

weight bar and loosen the rear screw.

The latitude adjustment on the CGEM II mount has a range

from approximately 15° to 70°.

Latitude

Adjustment

Knobs

Azimuth

Adjustment

Knobs

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