Meade DS-2102 Instruction Manual download pdf (Page 15)

4. Point the telescope North. Use a compass or the North Star, Polaris as a guide to locating

North.

Dur

ing

EASY TWO-STAR ALIGN, A

utoStar automatically chooses two bright stars from its data-

base. The user is then requested to center the stars in the eyepiece and press ENTER.

wo-Star Alignment

requires some kno

wledge of the night sky. AutoStar displays a database

of bright stars and

two stars are chosen by the observer from the database for alignment. It is

recommended that you choose stars with which you are familiar the first trying out this method.

One-Star Alignment also requires some knowledge of the night sky. One-Star Alignment is

identical to Easy: Align (see

EASY (TWO-STAR) ALIGN, above), except AutoStar displays a data-

base of br

ight stars and only

one star is chosen b

y the observer. The accuracy of One-Star

Alt/Az Alignment, unlike the Two-Star Alignment procedures, depends on how well the observ-

er levels the telescope and how close to North the telescope is pointed when setting the Home

Position (

Fig. 16). Because the Two-Star Alignment methods use two stars to align upon, they

are more precise than One-Star Alignment.

Date changes the date used by AutoStar. This function is useful to check events in the past or

future. For example, set the Date menu for a day three months in the future. Then check the

"Select Item: Event" menu for the Sunset time on that date. See

EVENT MENU, page 24.

Time changes the time entered into A

utoStar. Setting the correct time is critical for AutoStar to

properly calculate locations and events. Time may be set to 24-hour mode (military time) by

selecting the "blank" option which follows the "AM" and "PM" options.

Daylight Saving is used to enable or disable Daylight Savings time.

NOTE: Daylight Savings Time may be referred to by different names in various areas

of the world. Check local time to verify.

Telescope accesses the several options, including:

N Model: Allows you to select the telescope model connected to AutoStar.

N Focal Length: Displays the focal length of the selected telescope.

N Az Ratio and Alt Ratio: The Az (Azimuth) ratio and Alt (Altitude) ratio refers to the gears

of the telescope's motors. Do not alter these numbers.

N Az Percent: The Az (Azimuth) Percent allows you to change the azimuth backlash, i.e., the

way the Arrow keys move the telescope along the azimuth (horizontal) axis. If you enter a

value near 100, the telescope tube responds more quickly (it responds immediately at

100%) as you hold down an Arrow key and also slews (moves) the tube more quickly. If

you enter a value near 0, it takes longer for the tube to respond as you hold down an Arrow

key and also slews the tube more slowly. Experiment with this option. Try changing the per-

cent value until you get a "feel" for the Arrow keys that is comfortable for you.

Alt P

cent

The Alt (Altitude) P

ercent oper

ates identical to the AZ Percent option (see

abo

e), b

ut allo

ws you to change the altitude backlash,

i.e

the w

y the Arro

w k

eys move

the telescope when mo

ving along the altitude (vertical) axis.

N T

rain Drive

Trains the Altitude and Azimuth motors to locate objects with more precision.

If y

ou are e

xper

iencing an

y prob

lems with pointing accur

acy, select the Tarin the Drive

procedure and f

ollow the on-screen instructions, to insure accurate pointing and tracking.

N T

rac

king Rate:

Changes the speed at which the telescope tr

ks targets in the sky

Sidereal: The def

ault setting f

or A

utoStar

;

sidereal r

ate is the standard rate at which

stars mo

e from East to

West across the sky due to the rotation of the Earth.

Lunar: Choose this option to properly track the Moon over long observing sessions.

Custom:

Allo

ws entry of user-defined tracking rates.

N Re

ver

se L/R:

erses the functions of the Left and Right Arrow keys (

i.e

, the Right k

moves the telescope to the left

N Reverse UP/DOWN: Reverses the functions of the Up and Down Arrow keys (i.e., the Up

key moves the telescope down

Note: The time and

date information is

kept by a high

precision internal

clock, which is set

at the factory and

held by a long-life

lithium battery.

Replace the internal

clock’s battery with a

CR2023 lithium

battery. This battery is

located in the battery

compartment.

The battery is avail-

able from Meade,

photographic supply

houses or any place

lithium batteries are

sold.

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Meade DS-2102 Instruction Manual Page 15

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