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    User name Feng

    Log entry time 06:30:07 on January 21,1999

    Entry number 9532

    keyword=Encoder Dancing

    There is a mis-readout of the target ladder position. We did some test on the "empty" position to find the pattern. Here is the result:

    1. Initially set the ladder at position 83836, after sometime(maybe two hours) it stabalized at 83564, 272 points below.

    2.Initially set the ladder at 83823, after about an hour, it stabalized at 83602. Again 221 points below.

    This means at least for the empty position, there is always a 200 to 300 point mismatch between initial and final readings. So to put the target ladder in the accurate position, we should initially set it 200 - 300 point above the nominal encoder number.

    Also we need to test this for the target cell position(beam position) -- when beam is not on of course.