filiberto.clara@LIGO.ORG - posted 16:24, Friday 12 October 2012 - last comment - 10:04, Wednesday 17 October 2012(4436)
MC1 Bottom Stage
Looked at MC1 (Bottom stage) UL channel, which showed low counts ~9000 compared to the expected 24,000 counts. Traced problem to IO Chassis (h1sush2a). Replaced ADC card SN110201-04 with SN110203-20. Problem still persisted, replaced ADC Adapter Board (D0902006 SN S1102390) and cabling inside IO chassis with a spare (no SN number). Have requested a replacement from CIT. Will replace sometime next week, but SUS is able to continue transfer functions on MC3. Filiberto Clara
Mark reports that the TFs taken Friday, looked noisy. The situation with MC3 deteriorates. Picking up where Filiberto/Jeff left off last week, I find that indeed no EXC is getting through to the MC3 tops, hence the lack of coherence in Friday's measurements. Because this is possibly related to what Fil did on Friday with respect to switching out some boards (alog above), he is now looking again at the boards.
While I was in the cleanroom, I chased a moth and finally caught it as it was perched on the MC1/MC3 shared in-vacuum quadra-puss. Ugh - now I have to switch that cable out as well.