User name R. Michaels
Log entry time 02:43:06 on October20,2002
Entry number 88508
keyword=DAQ problems and solution
The DAQ was running with very high deadtime. The problem was traced
to an ADC in slot 22 of ROC2. Tests showed no problem with the module itself
and no large frontend deadtime. It turned out that the front panel gates were
flooding the module with data. Although this signal seems ok, I switched to
a back panel gate instead. Now it works fine again.
I had to borrow a twinax cable that had been used to collect the busy signal
from ROC2. Therefore, it is safer to run in UNBUFF mode until we replace
this cable. Actually I think COINC is probably ok, since we impose a minimum
deadtime which makes the busy signal practically unecessary, but without that
cable there are no guarantees. So, UNBUFF for now.