User name R. Michaels
Log entry time 14:25:59 on February25,2002
Entry number 4171
keyword=DAQ problems, fixed, we think
There were three observed problems with DAQ: 1) Since Friday we had noticed
that running test code on the ADC in slot 25 of roc2 led to SFI arbitration errors;
2) Large fluctuations in roc2 busy signal - so we had removed this crate from the
OR'd busy, which was dangerous. It was noted Friday. 3) Today the experiment
complained about deadtime fluctuating from 20 to 80 %.
We took access and replaced the ADC 1881 in slot 25. This solved the first 2
problems and probably the 3rd, though its hard to say about the 3rd. I ran DAQ
at 1.8 kHz, deadtime stable. The roc2 busy is plugged into the OR'd busy again.