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    User name R. Michaels

    Log entry time 17:47:59 on July19,2006

    Entry number 174541

    This entry is a followup to: 174525

    keyword=L-arm offsets need adjusting (BPM)

    Ok, I think I know what's wrong with BPM/raster on L-arm DAQ (new
    readout): You can tell by looking at R-arm, comparing a pedestal
    run (fig 1) to a run with no beam and "autogain" turned on (fig 2).
    The pedestals are shifted to the left by ~500 channels, which is
    in direction of positive signals. So, the same thing happens on
    L-arm presumably, but there is no headroom. Solution, I think, is
    to put more DC offset towards negative signal.


    FIGURE 1

    FIGURE 2