Make New Entry, Make Followup Entry
User name V. Sulkosky
Log entry time 21:13:47 on October 28, 2008
Entry number 245202
keyword=L1A BigBite and HRS Copies AgreeI went back and looked at the L1A copy on the HRS. The L1A was coming
after the TDC gate (1875 TDC), but only by about 10 ns. I figured that
this was causing the problem. So I delayed this copy of L1A by 40 ns.
I now see a 1-to-1 match between BigBite L1A and HRS L1A counts in the
respective TDCs, see Figure 1 from run 2390.
The cable for the gate and L1A going to the 1875 were probably different
lengths and unfortunately the gate cable is probably longer. Hence, the
10 ns probably was probably reduced to no delay or negative causing
the L1A signal to come before the gate.
A copy of this log entry has been emailed to: kalyan
Figure 1
