Bedienungsanleitung Celestron CGEM DX (Seite 16 von 38) (Englisch)

667036

Zoom out

Zoom in

Vorherige Seite

1/38

Nächste Seite

OTA Orientation — Some users may wish to use an optional

tandem bar adapter which allows you to attach to the mount

two optical tubes at the same time. When most tandem bars

are attached to a mount, the optical tubes are positioned

at a 90 degree angle from the standard conﬁguration. In

order for the mount to be successfully aligned with the stars,

it must know that a tandem bar is being used and in which

direction the optical tube(s) are positioned (East or West) when

beginning an alignment.

The tandem option must be set before beginning any of the

initial star alignments. To set this option, go to the Scope Setup

menu and select the Tandem option and press ENTER. Then

select from one of the following options:

• East — If the attached optical tubes are facing towards

the east when the declination index makers are align,

select East.

• West — If the attached optical tubes are facing towards

the west when the declination index makers are align,

select West.

• Normal — If the tandem bar is no longer being used,

select “normal” to turn off this feature.

Meridian — This feature instructs the mount on how to respond

when it is slewing to objects that are accessible from both sides

of the Meridian. See ﬁgure 3-3 for a deﬁnition of “Meridian”.

The Meridian feature allows the telescope tube to remain on a

desired side of the mount when slewing, and continue to track

according to the RA slew limits the user has set. See RA Limits

below. The Meridian feature allows for four choices:

• FavorCurrent — Allows the mount to favor whatever

side of the mount that it is currently on when slewing to

objects close to the Meridian. For example, if you RA

slew limits are set to allow the mount to track 10 degrees

past the meridian, then the telescope will continue to

stay on its current side of the Meridian when slewing

to objects that are as far as 10 degrees beyond

your Meridian.

• FavorWest — If the target object is accessible from

both sides of the mount, selecting “Favor West” instructs

the telescope to point to the object as if it were on the

west side of the meridian. The optical tube will then be

positioned on the east side of the mount and pointing west.

• FavorEast — If the target object is accessible from

both sides of the mount, selecting “Favor East” instructs

the telescope to point to the object as if it were on the

east side of the meridian. The optical tube will then be

positioned on the west side of the mount and

pointing east.

• Disable — This is the default setting, which instructs the

mount to always swing around to the other side of the

pier as required to view objects on the opposite side of

the Meridian. However once at the desired object, the

mount will continue to track past the Meridian according

the RA slew limits that have been set.

Mount Settings — Once the mount setting have been

calibrated (see Utilities section below) the values are stored

and displayed in the hand control. It is not recommended that

the calibration values be changed, however each setting can

be changed if necessary to improve the performance of

the telescope.

• Cone Value – This is the cone error value set when

Utilities / Calibrate Mount / DEC Switch - Cone is

carried out.

• DEC Index - This is the declination index error value

that is stored when calibration stars are added after your

initial star alignment.

• RA Index - This is the R.A. switch error value set when

Utilities / Calibrate Mount / R.A. Switch is carried out.

RA Limits — Sets the limits that the telescope can slew or

track in Right Ascension (R.A.) before stopping. The slew limits

are represented in degrees and by default set to 0º, being

the position of the telescope when the counterweight bar is

extended out horizontally. However, the slew limits can be

customized depending on your needs. For example, if you

are using CCD imaging equipment that has cables that are

not long enough to move with the telescope as it slews across

the sky, you can adjust the slew limit on the side of the mount

that is restricted by the cables, and command the mount the

stop slewing before it reaches this point. Or if you are taking

an image of an object that has just crossed the Meridian, you

can set the limit to allow the mount to continue tracking in the

same direction past the Meridian without the need to “ﬂip”

the telescope around to the opposite side of the mount (see

Meridian

feature above). Using the ﬁrst example above, the

user could slew the telescope in R.A. (azimuth) until it reaches

the point that the cables are extended to their maximum.

Then by displaying the telescopes azimuth in this position

(by looking at Get Axis Position under the Utilities menu) you

can determine the telescopes azimuth at its most extended

position. Enter this azimuth reading for either the maximum or

minimum azimuth slew limit to ensure that the telescope will

not slew beyond this point.

The telescope slew limits can be set to automatically stop

anywhere between 40º above level to 20º below level (see

ﬁgure 3-4). To set the RA Slew limit select the following:

• RA East Limit — Enter a number between +40º to -20º

to deﬁne the slew limit when the tube is on the east side

of the mount.

• RAWestLimit — Enter a number between +40º to -20º

to deﬁne the slew limit when the tube is on the west side

of the mount.

• Disable Limits — This disables any pre-deﬁned values

that have been entered and allows the mount to track

the maximum amount pass the Meridian (ie. -20º on

both sides)

Warning: In order for the telescope to be able to slew

to a star from the direction that minimizes the amount

of backlash in the gears, it may be necessary for the

telescope to slew beyond the speciﬁed slew limit in order

to approach the star from the correct direction. This

can limit your ability to slew to an object by as much as

6º from the RA slew limit set in the hand control. If this

proves to be a problem, the direction that the telescope

Figure 3-4

Celestron CGEM DX Seite 16

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info