Log entry time 18:17:14 on February 10, 2011

Entry number 346317

This entry is a followup to: 346302

The cause of the double pulse appears to be isolated the S1 EDTM module.  
The second set of outputs 3 and 4 appear to be the cause of the pulse.  At
least when these are removed from the trigger, T3 no longer double pulses.
With Brad, we found that there was about a 15-20 mV DC offset from the 
output of the module.  It's not clear how to adjust this offset without
further investigation.

The S1 discriminator threshold was set to -40 mV.  The pulse from these 
channels appears to have a small second pulse about 30-40 mV in amplitude.
As a stop gap measure, Brad suggested increasing the threshold to see if 
the second pulse would vanish.  We found that increasing the threshold to
-41 mV removes the double pulse.  To avoid being close to the edge of the
threshold, we made the S1 discriminator threshold to be -45 mV.

We should investigate this further to eliminate the problem, but the 
coincidence timing is more important at this point.