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    User name R. Michaels

    Log entry time 12:14:23 on April27,2009

    Entry number 269098

    keyword=DAQ checks, pedrun problems

    DAQ tests with no beam:

    R-HRS

    I made sure RightUnbuff runs fine.
    I also ran the pedrun config.
    The old pedestals are in ~/save_27apr09
    The new pedestals are similar.

    L-HRS

    Ran the pedrun config. I can't see anything wrong
    with the procedure but the pedestals are VERY DIFFERENT
    from what is in ./save_26apr09. Perhaps there is noise ?

    The two dangers of pedestal cuts

    1. if too low you may get deadtime
    2. if too high you may throw away data (bad !!)

    We should perhaps get a student to analyze
    the pedestal runs /adaql*/data*/*ped* and make the
    pedestal files ~/ped/ped*.dat carefully "by hand".

    The pedestals hardly ever need to be updated, perhaps never.
    They are very stable as long as nobody adjusts the width of
    the ADC gates or PMT HV.