ASTRO-PHYSICS 400GTO Інструкція з монтажу Посібник з монтажу - Сторінка 7

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weight and require more hand effort. Later, you will do your final polar alignment with the telescope and counterweights

attached, but the adjustments will be small.

If the R.A. encoder housing and encoder adapter are installed (part # ENC400 - Mounted Encoders to use with

Digital Setting Circles - are available as an optional purchase), you may remove them to complete these steps.

Please refer to the section pertaining to encoders later in the manual. Alternatively, you can simply sight up the

side of the polar axis to see Polaris.

If you examine the polar axis assembly, you will see that the center of the polar shaft is hollow. You may need to

rotate the internal declination shaft by moving the top of the declination axis (or the cradle plate if it is attached) to

align the sighthole that has been drilled into it. Now, you can look through the shaft to the other side.

Loosen the two black plastic clamp knobs on each side of the mount. Use the 5/16" hex key to loosen the 3/8-16

socket head cap screw on the side of the mount base. If your scope is mounted, support its weight with your other

hand since you are loosening a critical bolt.

Your goal is to sight Polaris when looking through the polar alignment sight hole in the center of the polar axis.

You will need to make altitude and azimuth adjustments to the position of the mount.

Azimuth adjustments: Move the entire pier or tripod

east or west until the mount is oriented approximately

towards the pole (an imaginary line drawn through the

hollow shaft). Use the two fine azimuth adjustment

knobs, one on each side of the mount, to make

adjustments. You must back off the opposing azimuth

knob in order to move the other knob in that direction.

Altitude (latitude) adjustments: Move the polar axis

up or down with the large altitude adjustment knob

located at the rear of the mount assembly. We have

found that using the turnbuckle on the north leg of our

pier also can make fine altitude adjustments, if used.

Continue your azimuth and altitude adjustments until

you can sight Polaris in the polar alignment sight hole.

At this point, you have achieved rough polar

alignment, which may be sufficient for casual visual

observations, if you are not planning to slew to target

objects with the keypad. When the R.A. motor is engaged (the power cord is plugged in), it will compensate for

the rotation of the earth and keep the target object within the eyepiece field of view. Your target object will slowly

drift since polar alignment at this stage is only approximate. However, you can make corrections with the N-S-E-W

buttons of your keypad controller.

Snug the two black plastic clamp knobs and one 3/8-16 screw to lock the mount into position. You will complete

your polar alignment and calibrate on a star with your keypad controller when your telescope is completely setup

and you are ready to observe.

Assemble Cradle Plate

Several mounting plates are available for the 400 mount. If you own more than one instrument, you may need more than

one plate. Attach your mounting plate with the screws provided. It is important to use the proper screws, please refer to the

"Mounting Plate Fastener Chart" included with this manual.

Assemble Counterweight Shaft

IMPORTANT: Always attach the counterweights before mounting the telescope to the

cradle plate to prevent sudden movement of an unbalanced tube assembly which may

cause damage or injury. Remember counterweights are heavy and will hurt if they fall on

your foot.

Thread counterweight shaft onto the Dec. axis.

Remove the hand knob and washer from the base of the counterweight shaft. Add sufficient counterweights (6 or

9 lb. counterweights are available) to the counterweight shaft to balance the telescope you intend to use. Always

use two hands to attach or move them on the shaft. Reattach the hand knob and washer to the end of the

counterweight shaft. This will help to prevent injury if someone accidentally loosens the counterweight hand knob.

(purchased separately)