filiberto.clara@LIGO.ORG - posted 10:57, Tuesday 08 October 2019 - last comment - 17:07, Tuesday 08 October 2019(52349)
HAM6 Ground Loop Check
Ground loop checks for SUS HAM6 complete.
Same issues with ZM1 and VOPO as seen in last November's vent, alog 45409.
HAM6:
ZM1 (Cable label SUS_SQZ-20) Pin 2 shorted to ground
VOPO (Cable label SUS_SQZ-2) Pin 13 shorted to ground
List of cables tested:
H1:SUS_10 (OMC), H1:SUS_11 (OMC), H1:ISC_236, H1:ISC_237, H1:ISC_238, H1:SQZ_1, H1:SQZ_2, H1:SQZ_20, H1:SQZ_21, and H1:SQZ_30.
Ground loop checks for ISC HAM6 complete.
Notes on method used for testing cables:
Checked Pin 13 and shield are tied together. Checked that all pins are not tied to chamber GND.
ISC_307 When testing cable disconnect ISC_404 (OMC QPD)
ISC_404 Passed
ISC_409 Pin 13 and shield not connected
ISC_232 Currently not used
ISC_233 Pins 3&4 shorted in-chamber. Pin 4 pulled.
ISC_234 Passed
ISC_235 Currenlty not used
ISC_265 Pins 14 & 15 connected to sheild (DB15 connector at rack)
ISC_266 Pins 14 & 15 connected to sheild (DB15 connector at rack)
ISC_316 Pin 5 not connected (DB9 connector at rack in CER)
ISC_317 Pin 5 not connected (DB9 connector at rack in CER)
alog 42281, alog 41722, and alog 45409 entries describing existing issues.
Tip-Tilt cables ISC_236, ISC_237, and ISC_238 are now in the SUS-R4 rack next to HAM5.
F. Clara, K. Kawabe