Looked at electronics for HAM6 Cap Position Sensors. Hugo and Jim reported signals were not stable. 
When only corner 1 and 2 were powered up, signals behaved as expected. When corner 3 was powered up, all signals became unstable, some jumping about -2000 counts every few seconds. Looked at electronics in CER but could not find any issues. Disconnected CPS field cables in CER and placed a dc voltage on all inputs. Looked at outputs and could not find any offsets or oscillations. Went out to the floor and disconnected the following:
All grounding cables
CPS sensors going to the satellite racks next to the chamber
timing sync cable
Communication cables going back to CER
power cables

Reconnected all cabling, and looked at looked at signals with Hugo. Everything was within range, and seems to be responding. We are suspecting we might have had a grounding issue. 7-25-2013