Astrel Instruments AST492 Başlarken - Sayfa 11
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Astrel Instruments
◦ OIII
This is the order that is preset in the APT application: if you need a different order,
remember to change it also in the ATP application.
WARNING: do not push the wheel down while screwing to avoid any tilt of the
wheel on its axis: to properly operate, the wheel has to stay parallel to the filter
wheel box floor
4. Before mounting the last filter, remember to check if you have to clean the optical window
in front of the sensor
5. Put the camera top plate back in place and fix it with the six screws.
The positions of the filters are precisely aligned with the camera sensor in factory, but, if needed
, it can be fine tuned by modifying the file filterwheel.dat located in the C:\Users\astro\sw_astrel\
bin\apps folder. This file contains a list of numbers representing the following data:
<position 1 offset>
...
<position 7 offset>
<calibration position length>
where <position n offset> is a number representing the additional number of motor steps in
order to have the filter perfectly centered with the sensor. By changing this number you can
modify the final position of the filter: the bigger the number, the longer the movement.
WARNING: do not change <calibration position length>, which is set in factory to the
correct value, changing it could lead to filter wheel operation failure.
Getting Started
11/11
AST492
rev A