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Reports until 09:16, Thursday 11 December 2025
H1 ISC
jeffrey.kissel@LIGO.ORG - posted 09:16, Thursday 11 December 2025 (88476)
Thanks DIAG_MAIN! Found ASC_REFL_9_I Analog Whitening Settings didn't match the Digital Compensation; From Beckhoff Restart
J. Kissel, S. Dwyer

As we resume power-outage recovery lock acquisition now that the environment is more suitable than it's been in a week (LHO:88473), we (as in DIAG_MAIN) found this morning the ASC_REFL_9_I analog whitening state (whose setting is managed by Beckhoff) didn't match the digital compensation (whose setting is managed by h1asc SDF system). We suspect that this is a symptom of yesterday's beckhoff == twincat computer reboots that were necessary to support the beckhoff chassis upgrades for JAC (LHO:88463). 

Not sure where/if these analog whitening settings are in the Beckhoff SDFs, but I've trended
    - H1:ASC-REFL_A_RF9_I1_SWSTAT      digital compensation setting status
    - H1:ASC-REFL_A_RF9_WHITEN_SET_1   analog setting status
and have now reset them to "normal," with 2 stages of whitening ON, and FM1 and FM2 compensating them.
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