User name R. Michaels
Log entry time 09:53:31 on December 8,1999
Entry number 30767
keyword=BPM Pedestal Run 1191
With some help from Tom Powers, I did a pedestal run
for BPMs 3A and 3B. Run # 1191. See procedure below.
I loaded the pedestals into "spot++" code. The pedestals
on the antennas (xp, xm, yp, ym) of 3A and 3B are:
ped3axp = 2105; ped3axm = 2104; ped3ayp = 2098; ped3aym = 2098;
ped3bxp = 2090; ped3bxm = 2085; ped3byp = 2085; ped3bym = 2086;
I remind that BPMs 8 and 12 are not plugged into an ADC yet,
so no pedestals yet.
I believe that "spot++" calibration should be ok to within 20%
now, but THIS HAS NOT BEEN CHECKED (Marat, please ?).
Here is the procedure for BPM pedestal runs:
1. Set "forced gain=0" on BPMs 3A, 3B. MCC may know how
to do this, but Tom Powers surely does. He tells me one goes to
EPICS screen "SEE Diagnostics", then "Experts" screen, then to
"Gain Control" where one selects "forced gain" and sets its value to zero.
2. Do a CODA run, pulser trigger ~200 Hz, no beam. This run
3. REMEMBER: Reset the BPMs to a normal state. Easiest
way is to go to "Expert" screen and press "reset".