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    User name zhangyi

    Log entry time 00:17:12 on May 03, 2009

    Entry number 270531

    This entry is a followup to: 270520

    Followups:

    keyword=gain problem?

    in the following plot, the black line is the pmt which seems have problem.
    red line is on the same pmt in previous run which looks fine. For the red
    line, I decreased the amplitude by a factor of 2. The shapes of two lines
    are same(single photon electron peak VS. main peak). To me that means we
    still get the same number of photon electrons in that pmt. So it should
    not be a big issue. 
    





    Figure 1