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    User name R. Michaels

    Log entry time 14:04:59 on October27,2014

    Entry number 402971

    keyword=Fixed QRT. Helicity signal check

    The QRT signal had a problem: the logic fanout was going back to the patch panel.
    Somehow this reduced the output by a factor of 2 so that the signal no longer
    conformed to NIM standard. I don't know what the purpose of that cable back to
    the patch was, but I sent it by another route which removed this feature. Now QRT
    appears in the datastteam.

    Some checks of the datastream for run 2374 (DVCS_test config) are in fig 1.
    This looks pretty good except that the helicity is not 50% in the two states.
    This is for trigger T9. I did make a cut on the gate (aka MPS) but that
    didn't help. It needs to be checked.

    FIGURE 1