Encoder offsets/corrections.


    The vertex software has encoder corrections that can be interactively modified via the ocu or lcu interface. The corrections are added to the encoder value read from the hardware. The documentation claims that the limit positions are also modified by these corrections. When adding a correction, the display position includes the correction. Preset mode works fine with the correction (eg. start at 270, add correction=1deg, display reads 271, preset to 270 moves the telescope be 1 degree). I think that program track mode works differently with the offsets.. mainly because we had an offset of 1 degree for 5 months and we could still see sources.

Note: 13dec08: param.dat files updated to have 0 offsets in them (during klaus's visit).

Testing the az encoder corrections: 18jun08