Log entry time 23:26:06 on February 07, 2011

Entry number 346145

This entry is a followup to: 346098

Followups:

• 346174 02/08/11 18:15 V. Sulkosky Note LHRS T3 Rate

I was able to simulate the T3 trigger with the EDTM system on the Left 
HRS.  For S2m, I took the back output from the S1 module to fan-out to 
the splitter boxes on the detector.  This helps ensure that the T3 
simulated trigger has a rate of about 12.5 Hz.  For some reason, the back
output from the S2 module was only 5 Hz.  I assume the prescale was being
set differently for this module.

With this setup, I found that the simulated "OR" of S2m came about 90 ns
 after the "OR" of S1 at the location that T3 is formed.  I added the 
parameter DLefT_S2M in the edtmsetup file and set it to 50.  With this 
delay in the S1 EDTM signal, the "OR" of S1 EDTM now comes about 40 ns
before the "OR" of the S2m EDTM.  This is the opposite way compared to 
how T1 is set on the right arm.  We probably should change T1 so that 
the S2m "OR" comes after the S1 "OR".

btw for cosmics, S1 "OR" comes about 30 ns before the S2m "OR" for T3.