daniel.sigg@LIGO.ORG - posted 10:38, Tuesday 26 August 2025 - last comment - 13:21, Tuesday 26 August 2025(86568)
Whitening chassis for ASC-AS_C and OMC-REFL_A changed
This continues work from alog 86442. A new cable, D2500252, was made to replace the old ISC_455 (D2200327) and ISC_39 (standard 25-pin d-sub cable).
The DC offset have been adjusted but not accepte din SDF.
The second anti-whitening filter of OMC-REFL_A is now a normal anti-whitening filter, zpk([10],[1],1,"n"), and not the antiLP, zpk([49.63],[497.5],-0.9995,"n"). However, the filter files are not updated yet.
Initial alignment post-maintenance is currently failing at SR2_align because there is no signal on AS_C. We think this change may be the culprit.
And back to the old board. Seems we have an issue with the new cable...