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    User name V. Sulkosky

    Log entry time 18:20:44 on November 2,2009

    Entry number 297197

    keyword=S1 1R TDC Noise

    Bogdan suggested lowering the HV on the S1 # 1 PMT on the right-hand
    side by 100 Volts to see if this lowers the number of noisy hits in
    the TDC.

    Figure 1 shows the S1-1R TDC after the HV was lowered and Figure 2
    shows the same TDC before lowering the HV. The noise dropped from
    about 29% down to 8%.

    FIGURE 1

    FIGURE 2