Handleiding Celestron CPC Deluxe 800 HD - 11007 (pagina 17 van 50) (Engels)

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Setup Time-Site – Allows the user to customize the CPC display by

changing time and location parameters (such as time zone and

daylight savings).

Anti-backlash – All mechanical gears have a certain amount of backlash

or play between the gears. This play is evident by how long it takes for a

star to move in the eyepiece when the hand control arrow buttons are

pressed (especially when changing directions). The CPC’s anti-backlash

feature allows the user to compensate for backlash by inputting a value

which quickly rewinds the motors just enough to eliminate the play

between gears. The amount of compensation needed depends on the

slewing rate selected; the slower the slewing rate the longer it will take

for the star to appear to move in the eyepiece. There are two values for

each axis, positive and negative. Positive is the amount of compensation

applied when you press the button, in order to get the gears moving

quickly without a long pause. Negative is the amount of compensation

applied when you release the button, winding the motors back in the

other direction to resume tracking. You will need to experiment with

dierent values (from 0-99); a value between 20 and 50 is usually best

for most visual observing, whereas a higher value may be necessary

for photographic guiding. Positive backlash compensation is applied

when the mount changes its direction of movement from backwards to

forwards. Similarly, negative backlash compensation is applied when the

mount changes its direction of movement from forwards to backwards.

When tracking is enabled, the mount will be moving in one or both axes

in either the positive or negative direction, so backlash compensation will

always be applied when a direction button is released and the direction

moved is opposite to the direction of travel.

To set the anti-backlash value, scroll down to the anti-backlash option

and press ENTER. While viewing an object in the eyepiece, observe the

responsiveness of each of the four arrow buttons. Note which directions

you see a pause in the star movement after the button has been pressed.

Working one axis at a time, adjust the backlash settings high enough to

cause immediate movement without resulting in a pronounced jump

when pressing or releasing the button. Now, enter the same values

for both positive and negative directions. If you notice a jump when

releasing the button, but setting the values lower results in a pause when

pressing the button, go with the higher value for positive, but use a lower

value for negative. CPC will remember these values and use them each

time it is turned on until they are changed.

Slew Limits – Sets the limits in altitude that the telescope can slew

without displaying a warning message. By default the slew limits are set

to 0º to 90º and will only display a warning message if an object is below

the horizon. However, the slew limits can be customized depending on

your needs. For example, if you have certain photographic accessories

attached to your telescope preventing it from pointing straight-up,

you can set the maximum altitude limit to read 80º, thus preventing

the telescope from pointing to any objects that are greater than 80º in

altitude without warning.

Slew limits are applied relative to the base of the mount not the

actual horizon. So when setting the slew limits when using the

telescope on an equatorial wedge, remember that a minimum

slew limit of 0° would prevent the telescope from slewing down

past the celestial equator not the horizon. To set the slew limit so

that the telescope will slew to the horizon while on a wedge, you

must set the minimum slew limit to equal your latitude minus 90°.

Filter Limits – When an alignment is complete, the CPC automatically

knows which celestial objects are above the horizon. As a result, when

scrolling through the database lists (or selecting the Tour function),

the CPC hand control will display only those objects that are known to

be above the horizon when you are observing. You can customize the

object database by selecting altitude limits that are appropriate for

your location and situation. For example, if you are observing from a

mountainous location where the horizon is partially obscured, you can

set your minimum altitude limit to read +20º. This will make sure that

the hand control only displays objects that are higher in altitude than

20º. If you manually enter an object that is below the horizon using the

numeric keypad, the hand control will display a warning message before

slewing to the object.

If you want to explore the entire object database, set the

maximum altitude limit to 90º and the minimum limit to –90º.

This will display every object in the database lists regardless of

whether it is visible in the sky from your location.

Direction Buttons – The direction a star moves in the eyepiece varies

depending on the accessories being used. This can create confusion when

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