I did a couple more measurements of the ESD actuation tonight.

1)I re-ran the script that allows us to measure 4 coefficicents for each test mass, (described in 38387).  Plots coming soon...

2) I measured Veff by driving the signal electrodes in length while we were locked and adjusting the bias voltage to minimize the coupling to DARM.  This can be checked against the results from the first measurement.  Veff = (beta-beta2)/2(gamma-alpha)

3) For some optics I also measured a different effective bias, by driving the bias path at 12 Hz and changing the offset in the bias path to minimize the coupling to DARM.  Veff 2= (beta+beta2)/2(alpha+gamma)

Here I have written these as positive if the voltage requested out of the DAC is positive, although in reality there is a sign flip in some of the drivers (I will edit this entry in the morning with the correct sign).