Lacerta M-Gen User Manual page 46

The o value is displayed on the screen as
orthogonality of the two direction vectors is perfect. The value can be selected but does not
have any function yet.
The error in optimal circumtances (no wind, good mount) is generally under some percent.
The orthogonality is well enough above 90%, this means that the angle betweent the axes is
less than 6 degrees. This has almost no effect on the guiding performance, even higher errors
may be useful for an accurate guiding.
In wind using weak or overloaded mount the value could be 60-80% only. It is not advised
to accept them (a new calibration should be started) except when so bad circumstances make
it almost impossible.
Delete cal.
The
before a new calibration proceure can be started. (This deleted data can be restored with
Recall last
.)
5.1.10.2.2 Polar alignment screen
To set or make the mount's polar alignment more accuate there is a
method called "Declination drift" or "Scheiner" method. Using this
screen's functions You are able to do the required measurements and reduce Your polar
misalignment.
In brief about the polar misalignment error and the method:
In the case that the celestial polar axis (pole) is equal to the mount's RA axis, Your
pole is precisely aligned. Any star in the telescope's view will stay at the same DEC
position for any long time. (Nowt considering the air refraction etc.)
If Your pole is misaligned (ie. Some (say X) arcminutes off from the pole), a star on
the celestial equator in the telescope's view will move on a circle shape (per day),
which's radius is equal to the polar misalignment, X. So You measure these movements
close to the celestial equator and finetune the mount in Alt.-Az. to reduce the polar
misalignment error.
The method has two types of measuring, when we want to know the vertical
(altitude) component of the error or the horizontal (azimuth) one. So we correct on the
mount up/down or left/right respectively.
The user notes the amount of movement after every modification and measure to
know how many to turn the knobs etc. to correct for a given arcminute value. First, the
horizontal error is measured and finetuned until it reches near zero or can't be set lower.
Then the same is done for the vertical error. Iterating this two steps will reduce polar
aligment error down to the mount's limit.
The parameters and screen items are the following:

Pole
: (string) profile
Here You can choose the hemisphere/visible pole, northern or southern.

Time
: (real, 0.1 ... 30 minutes)
button can be used to delete the current calibration data. It is required
Ortho
, in percent. If this is 100% the
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