There should be an option. Don't use the mapping software, go into Control Panel, Game Controllers, and choose the X52 in the list that comes up. Go to properties, and in one of the 2 tabs there's a "Calibrate" option.
There should be, at any rate. I don't know what it looks like, as I don't have one. It may be hidden somewhere, but there is always a calibration function.
Just out of curiousity, when you move it around in the "test" does it move like it should, or is it kinda whacky like in AH?