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    User name R. Michaels

    Log entry time 09:14:47 on January26,2001

    Entry number 55779

    keyword=obscure note about T4

    Yesterday during the break between experiments I had mistakenly
    taken out 15 nsec delay from trigger 4, and I restored this parameter
    this morning (but it only takes hold the next time you download trigger).
    This is very minor. Just to remind, both T2 and T4 have two timing
    offsets. Since Jan 16 (halog 54803) the retiming comes from scintillator
    plane S2 only, so if S2 is present the retiming comes from it (and the
    delay I mentioned does not matter in this case), but if S2 is absent then
    the retiming is "forced" and the fastbus gate timing (T0 offset) slides with the
    trigger time. Although very obscure, I figured its worth mentioning it for
    students trying to figure how to analyze T2 and T4 accurately.