SUS HAM 5-6 System Wiring Diagrams D1002740
Grounding and Shielding at LIGO T1200131
Things to note:
1. HAM6 ISC cabling was not checked for ground loops
2. Short found on the OFI (cable SUS_SQ_30). Pin 13 shorting to ground. In-chamber ground NOT resolved.
3. All cables listed below passed testing:
SUS_HAM5_001 (SR3 Top)
SUS_HAM5_002 (SRM/SR3 Shared)
SUS_HAM5_019 (SR3 Middle)
SUS_HAM5_020 (SR3 Bottom)
SUS_HAM5_003 (SRM Top)
SUS_HAM5_025 (SRM Middle)
SUS_HAM5_026 (SRM Bottom)
SUS_ZM6_21 (ZM6)
SUS_HAM6_10 (OMC Top/Left)
SUS_HAM6_11 (OMC Right/Side)
ISC_236 (OM1)
ISC_237 (OM2)
ISC_238 (OM3)
In HAM5, Mitchell and I could not find the source of the shield grounding issue on the OFI AOSEM cable chain. We did the usual tricks:
1) Disconnected 25pin at the feedthru to see if the connector screws were touching the flange (no they didn't seem to be)
2) Made sre the 4th unused quadrapus cable end was not stowed anywhere that caused grounding to the shield
3) Fussed with/lifted/recoiled all of the coils in many places, no change to grounding.
In the past, when none of the above fix the issue, the entire cable length gets swapped out. However in consult with Kissel and commissioners, we did not feel these AOSEM control warranted needing to do this given that we are mid O4b. Opening a ticket to deal with this later.