I retook the ETM OPLEV charge measurements this afternoon after the changes we made last week (HV switched off for ETMY digitally, and the sign of the bias offset flipped for ETMX from alog89809). I'm not sure why the error is larger on EX than EY, the wind was medium high but that would effect EY more than EX, the ends were seeing similar ground motion in the 0.03 - 0.1 band. I had no issues running the script, I switched it from scipy to numpy last week.

The sign change appears to be successful in reducing the charge on ETMX, every DOF/quadrant saw its' charge reduced from last week. We will be trying to measure this weekly now to confirm and possibly fine tune the settings.

ETMYs' charge looks to be  approximately the same as the last measurement, although 2/3 of the DOF/qs saw a small trend away from zero of <5 [V] at most compared to last week. The trend of the charge on EY from Nov (previous measurement) to last week was toward zero on all DOF/qs but there was a much larger time difference between those two sets of measurements (~five months vs ~a week).