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    User name R. Michaels

    Log entry time 01:25:28 on October28,2000

    Entry number 51129

    keyword=possible origin of EDT asymmetry

    It was observed during E97111 that the scaler measurements
    of EDT on L-arm was systematically higher (about 145 nsec)
    compared to R-arm (100 nsec). Before adjusting the MLU output
    widths, I measured the overlap of the trigger and pulser, used to
    measure EDT in scalers, and found it quite marginal on L-arm,
    but ok on R-arm. I made a detailed explanation in paper log book
    (book #2 for E97111, I believe), page 33. The idea is that multiple
    track events can make the overlap fail and the EDT seem artificially
    high. The recovery : Use the event analysis as N-delta did. I think
    that on R-arm the event analysis and scalers will agree. BTW, the
    overlaps are very good now.