J. Kissel, B. Weaver

Betsy launched charge measurements this morning, so I've processed them. The message: most quadrants of both test masses are at 0 [V] effective bias voltage, so we're again ready to start regularly flipping the bias voltage. We'll wait a bit for the IFO to have a higher duty cycle, or wait until the end of the week and just change it. Historically, if we change it when everything else is going wrong, the bias flip gets blamed and therefore it doesn't stick. We want to stick!

Remember that 
- we've now reverted back to compensating for the sign change in the SUS's DRIVEALIGN matrix (and not in the COILOUTF banks)
- we'll no longer change anything in the CAL-CS model, because the overall sign of the L3 stage doesn't change (LHO aLOG 29868)

Also, eventually, when the IFO's duty cycle picks up again and calibration team's analysis infrastructure re-solidifies, we can start making the comparisons against longitudinal actuation strength with calibration lines (e.g. LHO aLOG 24547), which should really be the metric for when to flip.