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    User name V. Sulkosky

    Log entry time 09:24:01 on August 27, 2008

    Entry number 242637

    Followups:

    keyword=No TDC signal for S1

    On Monday evening, the TDC signals for S1 vanished from the replay.
    Yesterday I traced this to the delay box used prior to going to the TDC.
    I could not see a signal from this box. Upon further investigation, I
    found that the signal width going into the delay box was only about 20 ns
    wide. It is known that these boxes require a signal closer to 100 ns wide.

    I tried to adjust the width from the 4413 LeCroy discriminator that we
    are using for S1, but the adjustment is at the edge of it's range. It
    appears that the discriminator's output changed and is now narrow.

    A copy of this log entry has been emailed to: rom@jlab.org,ycwang@jlab.org