Jim, Krishna,
After the troubles described in alog 17386, BRS was turned off to allow it to damp down naturally. This morning Jim and I restarted the BRS as attempted earlier in 17309. This time, the amplitude of the balance was low enough and we simply had to reposition the damper and start the software. Everything worked as designed. The attached plot shows the damping of the beam-balance.
After things had settled down I checked the spectra of the signals coming out of BRS and the tilt-subtracted super-sensor and everything looks normal. Wind speeds were at 0-10 mph and the subtraction looked good as seen in the attached pdf. The first plot shows the ground T240 X motion, the BRS_RY ( * w^2/g), ST1 T240 X and the super-sensor. The next plot shows coherences between these sensors.
Better late than never, right?
While I was at EX on this day, I also went out to the chamber and checked the corner 3 CPS rack (re: the bumbling line, most recently discussed in alog 17681) and found nothing amiss. All cables are secured, all CPS field racks are grounded and have all their screws. Haven't had time to look at this in more detail (pulling cables, cards, turning stuff off and on again, etc.).