User name R. Michaels
Log entry time 10:11:35 on October 5,2002
Entry number 87356
keyword=miscellaneous / HOWTO for BPM pedestals
A few things fixed or checked since 08:00:
1. Fixed online deadtime calculation in "datamon" to account for T9 (the
30 Hz un-prescalable trigger).
2. Fixed pedestal runs, so that pedestals are not suppressed for BPM/raster
data in fastbus (also not for helicity flag data). Did a pedestal run 1136.
3 . ESPACE complains about synchronization errors. There is always one extra
gate in ROC1 at start of run, but clean afterwards. (See ~adaq/synch/README).
4. I checked run 1131 for BPM/raster data. I agree with B. Reitz that the fastbus
data looks ok. We'll do a "bpm pedestal run" when there is no beam.
BPM Pedestal Run procedure :
(i)... No beam
(ii)... WITHROC14 config
(iii)... Go to MCC and ask them to: Open BPM EPICS control (expert screens).
(iv)... Change "auto gain" to "forced gain" for the BPMs 4A,4B.
(v)... Put the forced gain values to zero.
(vi)... Take pedestals for 5 minutes with pulser trigger T8.
(Success is achieved if the pedestals look like delta functions, i.e. very narrow.)
(vii)... Put BPMs back into "auto gain".