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    User name V. Sulkosky

    Log entry time 10:31:49 on February 09, 2011

    Entry number 346206

    keyword=Fast Clock in FB ROC 8,9 and 10

    For synchronization purposes, I connected copies of the fast clock 
    103.5 kHz to the scalers in the BigBite FB crates.  ROC 8 and 9 have 
    LeCroy 1151 modules, whereas ROC 10 has an SIS3800.  For all crates, the 
    fast clock is connected to the first scaler channel (1).  The LeCroy 
    modules require a gate to count, so I took a NIM-bar output to create the
    gate for them.  
    In the crl code, we just need to make sure that the scaler code is enabled 
    and reading out the correct channel.  At the start of run, the scalers
    are cleared.
    I would like to add a scaler to ROC 5 to add a copy there as well.
    I had a problem with the fast clock double-pulsing, which appears to be 
    related to a bad level translator output.  

    A copy of this log entry has been emailed to: brads,lselvy