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Thu Sep 4 11:33:25 2008, josephb, Eric, Jenne, Configuration, Computers, Attempt to increase gain for C1:PSL-ISS_INMONPD_F via 110B
Thu Sep 4 16:24:56 2008, rana, Configuration, Computers, Attempt to increase gain for C1:PSL-ISS_INMONPD_F via 110B
Thu Sep 4 11:33:25 2008
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josephb, Eric, Jenne
Attempt to increase gain for C1:PSL-ISS_INMONPD_F via 110B
We were attempting to increase the gain on the channel C1:PSL-ISS_INMONPD_F in preparation to do a scan of the PMC at very low input power.
We started by adding a line to the C1:IOOF.ini file in /cvs/cds/caltech/chans/daq/ under that channel that said "gain=10.0". Before touching anything, the channel was outputting around 4000 counts.
We hit the reconfig button for c1iovme16k, then rebooted c1iovme (which turned out to do nothing) and then the framebuilder, in a method consistent with the wiki. This turned out to put the channel in an odd state, where it was showing very rapid, random spikes, virtually but still around 4000ish counts. We returned the file back to its original format, hit reconfig, and then rebooted the framebuilder. The channel however, was still behaving in the same broken way.
After poking around the PSL table, looking at some direct outputs, we came back and rebooted c1iovme and the framebuilder again, which fixed the channel, such that it was reading out correctly. Taking this as a sign that maybe we should reboot the framebuilder, then c1iovme to get the channel to load changes, we changed the file again to have "gain=10.0". Upon reboot of the framebuilder, the channel was still reading out fine, but at the same level. So we continued with the reboot of c1iovme. This still had no effect on the channel output.
The ini file has been set back at this point, however since Yoichi is working, I'm holding off doing a reconfig and reboot on the framebuilder until later.