Last night, we seemed to have less number of the ETMY DAC saturation events presumably due to a combination of the new modification on the ESD driver electronics (25468, 25485) and moderate seismic and wind conditions. The DACs for driving the ESD now have more range above 152 Hz and therefore can tolerate some of the fast transients without hitting the DAC output range. As shown above, the BNS range plot from last night is cleaner than the typical O1 range plots. Looking at the undisturbed data from yesterday, we had only two saturation events (both of which occurred at the ESD stage of ETMY) out of the 9 hours lock stretch; one at the beginning and the other at roughly 10 minutes before the lockloss. See the attached trend.
A follow up:
I checked the number of saturations from a 14 hrs long stretch from this Wednesday's night as well. I found only two saturation events in the ETMY suspension (both of which happened in the ESD stage. One of them occurred at the ESD and L2 stages). See the attached trend.
The BNS range was already posted by Corey (25502) which showed two deep dips at t = 7 and 14 hours. These two correspond to the saturations at ETMY. I did not study the other small dips.
