david.barker@LIGO.ORG - posted 07:30, Monday 03 November 2025 - last comment - 13:55, Monday 03 November 2025(87917)
ETMX HWWD showing activity again, closely correlated to IFO lock state
The ETMX Hardware Watchdog started showing activity again around Wed 20oct2025. This does not appear to be related to any maintenance or Satellite Amp work. As the plot shows, its activity is very closely correlated to the IFO lock state, this was not the case earlier this year before it went quiet.
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Looking at several aquisitions this HWWD switching always starts around the LOWNOISE states such as LOWNOISE_ESD_ETMX, LOWNOISE_ASC, LOWNOISE_LENGTH_CONTROL, and I also saw it start at TRANSITION_FROM_ETMX..
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