If you have a little rotational position defect of the PH10/Tesastar..., when you calibrate, the first time, you can get different prehit around the sphere. Then you save the offsets as actual, so the next calibration will use the right prehit. If you set the rotation head square to axes, then you can reset all the offsets to theo, for all tips (youcan reset the tips to theo one by one in the measure window).
I saw once a people (very long time ago) who changed the sphere position, then calibrated manual+dcc wihout saying yes, the sphere moved. Offsets were about 1 meter !!!!
