Attached below are the results for the monthly charge measurements performed on the ETMX and ETMY. Due to time constraints we were only able to perform 3 measurements (against 5).

ETMX: The effective bias voltage has reached 40V (linear rise over time), for the pitch mode of the 1st quadrant . In the other 3 quadrants the bias voltage is 30V or below. For the Yaw mode, the bias voltage is around 40-45V for the 1st and 2nd quadrant, however it drops down to below 30V for the 3rd and 4th quadrant.

ETMY: For the pitch mode the effective bias is within limit and lower than 40V (zero for the 2st and 3rd quadrant). For the Yaw mode, the 2nd quadrant is still sitting at 50V, for the other 2 quadrants it is below 40V.

SDF overview: The lock bias offset values for the ETMY (flipped sign) and ETMY (changed from zero to 10.0. however this is switched off) changed, please see the ndscope plot attached. The values were later restored (based on the past trends) and any other SDF differences removed.