Charge measurements were performed today on the suspensions during the maintenance time and the results for the ETMX and ETMY are attached below.

For the ETMX, the effective bias (for pitch) for all 4 quadrant looks to be within +-20 V, however for the Yaw it looks to be slightly higher for the 1st and the 3rd quadrant, i.e. approximately 30V and 35V respectively. The 2nd and 4th quadrant (Yaw) is within +-20V.

For the ETMY, the effective bias for the three quadrants is within the permissible limits and trending towards zero.

After the measurements were finished, all the values were restored to it's original. The alignment sliders (for both ETMX and ETMY) were set back to it's original position and the amplitude for the L3 calibration line was set back to 0.55 (only for ETMX, as ETMY was zero by default). Once again, SDF showed that the biased voltage (ETMX) was turned OFF - which I have turned it back ON.