Lacerta M-Gen User Manual page 47

The timeout of the next measurement.

Star
: (string)
You must enter the direction here, where the star for the measurement is. This is
essential to get proper polar error direction displayed. (Southern/Northern, Eastern and
Southern part of the sky (near celestial equator) are the options.)

Calibrate
: (button)
To get the proper component of the drift, the autoguider must know the direction when
the DEC axis goes towards the opposite (non-visible) pole. This button starts the
procedure (after choosing an option): the current position is measured (4 sec.), after
the user is asked to move the DEC or RA axis a little bit more off towards some
direction, then the DEC's direction is calculated. This vector is displayed as a line
from the center of the view's window.

Measure
: (button)
Starts a new declination drift measurement.

LV
: (button)
Switches directly to the LiveView screen. (LiveView's window selection is
automatically set to return to this page.)
At Calibration, the user must give what axis he wants to use. If DEC is
selected, DEC must be moved off from the visible pole. For mounts having
only RA axis, two options are available, depending on if the guider's optics
has a mirrored image or not. After selecting the proper one (see later), the calibration starts
and the user must follow the instructions. The direction buttons can be used to move the
mount (with the autoguider signals) but be sure that the mount goes to the proper direction
and not to the opposite. For RA options, the proper direction is when the tracking is stopped
or slowed down.
In short words, use "with RA inv." option only if:
 there is a diagonal mirror in the guiding system (ie. for refractors)
 using an off-axis guider (ie. for Newtonians)
 any other case where the image is mirrored. (An odd number of mirrors in the
optical system produces this.)
Elapsed time is displayed during a measurement (- 0:00 is displayed until the first star
position -), which can be cancelled by pressing ESC any time: in the first 5 seconds (or if less
than 2 star position got yet) the measurement is cancelled and old error stays displayed. Else,
a new polar misalignment drift value is calculated. This calculation may need some seconds if
there is a huge amount of data (high frame rate for long time). (Processing speed is about 1k
data/star points per second.)
If there is a new/previous error calculated, the right pole's position (to the current one) is
displayed at the right bottom of the screen within an inverse box. The error unit is arcminutes.
The direction tells where the axis (intersecting the the 'sky hemisphere') should move if You
are facing the pole. For example if You are on the northern hemisphere, "Right" means that
the celestial pole is to the right (towards east) from Your mount's current axis, so You should
turn the mount azimut clockwise. "Left" means the opposite. "Up" and "Down" is implicitly
similar for the altitude.
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