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    User name V. Sulkosky

    Log entry time 20:57:17 on February 09, 2011

    Entry number 346243

    This entry is a followup to: 346242

    keyword=EDTM Setup Slightly Changed both HRS's

    I modified the EDTM setup for S2m so that I would be sending a narrow pulse
    into the S2m electronics.  By taking the back panel output, the signal is
    10 microseconds long.  I could still see this pulse coming from the ADC 
    cables before going into the long delay, though on a very zoomed in scale
    on the scope.  The EDTM pulses now are < 100 ns before going to S2m.
    From the ADC cable and before the long delay, the EDTM pulse is less than
    2 mV compared to the > 20 mV PMT pulse.  After the ~ 880 ns of delay, the
    signal should be hard to discern in the ADC spectra.  This should prevent
    any possible interference from the EDTM pulser.  Clearly 10 microseconds 
    was too long.
    The width was changed by going through another module on both HRS's.  One 
    can remove the EDTM signal by placing a cut on the variable DBB.edtmbb.  
    Before I leave, I will disable the EDTM signal and take a run without it.
     However it should not cause anymore problems if that was the issue.

    A copy of this log entry has been emailed to: danez,yez