J. Kissel, T. Sadecki, E. Merilh

We're find that all of the QUADs are saturating much more than usual this morning. Tracing the large control signals, it looks like that HARD loops' error signals are much larger than they were during the -12 hours ago lock stretch, and have been increasing since half way through. The investigation is still preliminary, but we've lost two locks already to this excess noise. Note that this is all well before any of the ISC_LOCK guardian's LOWNOISE_ASC step of which Jenne told us to be mindful (see LHO aLOG 28109).

I have a suspicion it's something obvious to the ISC experts, but this is what the engineering team gets for trying to replicate such rapid improvement from late last night!

The investigation continues...

Saturations start happening as soon as the CHARD Loops come on in ENGAGE_SRC_ASC.