AstroLink 4 Pi Manual - Page 14

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Temperature compensation

Temperature compensation in AstroLink 4 Pi is implemented linearly. So there is only one parameter

that describes how temperature affects the focus point. It is not a perfect approach, however, its

accuracy is good enough for most amateur setups.

The best way is to note the focuser position at different temperatures. When during session

temperature changes, the focuser position needs to be adjusted to maintain a sharp focus. When you

note these points of temperature and corresponding focuser position, then it is pretty

straightforward to calculate the compensation coefficient, i.e. the number of focuser steps required

to compensate for one-degree temperature change. And this value needs to be entered into the

Temperature coefficient field in the Options tab. When decreasing temperature requires the focuser

position to decrease, then the value will be positive.

Once you enter the compensation value into the Temperature coefficient field, you need also to

enable the compensation. Actual compensation is performed once the calculated focuser position

correction is larger than half of the critical focus zone. CFZ value is calculated and presented at the

Main control tab.

Rev. 1.0