User name R. Michaels
Log entry time 12:40:24 on January13,2002
Entry number 80251
Datamon reported DT = 11% at 200 Hz DAQ rate. But this was wrong, and due
to a recent bug associated with re-organization of scalers. Fixed. Now DT = 2%.
The DT may still be a bit high, but this would be because we are not suppressing
pedestals. The events sizes are 4.8 kbyte, about 4 kbyte coming from ROC4,
so ROC4 is dominating the DT.
Minor problem of deadtime calculation: We don't have T7 on the Left arm scalers,
so it is ignored. E.g. if ps7=1000 and T7 rate = 2000, it is a 2 Hz accepted rate.
If DAQ rate = 200 Hz, it is a 1% error in deadtime (this is the case, e.g. for run 1486).
Need to fix this . Simplest fix for now: set ps7=huge. (But I believe T7 is on RCS
scalers, so it's another way to recover.)