User name R. Michaels
Log entry time 17:47:59 on July19,2006
Entry number 174541
This entry is a followup to: 174525
keyword=L-arm offsets need adjusting (BPM)
Ok, I think I know what's wrong with BPM/raster on L-arm DAQ (new
readout): You can tell by looking at R-arm, comparing a pedestal
run (fig 1) to a run with no beam and "autogain" turned on (fig 2).
The pedestals are shifted to the left by ~500 channels, which is
in direction of positive signals. So, the same thing happens on
L-arm presumably, but there is no headroom. Solution, I think, is
to put more DC offset towards negative signal.