Last Friday, HAM7 was vented and the mega cleanroom was on, but chamber doors were on, FC1 sliders were at 100 urad P, -162 urad Yaw, and the M3 witness sensors were -90 urad pitch, -15 urad.  Since then, there was a power outage, the chamber doors are off and the purge air is on, and tha DAC has been changed as it was not working 90454.  Now, with the same slider settings (100 urad P, -162 yaw), M3 withness sensors are at 24 urad pitch, -204 urad yaw.  

In 89751, Oli noted that turning on the purge air caused a shift of -29urad in the bottom mass osems.  If purge air were the only difference between now and Friday, we would expect M3 witness osems to say -120 urad, if the purge air is similar to what it was in December.  So, it seems like the electronics change has changed the realtionship between the slider value and the witness sensor.  

On May 7th, we moved the pitch alignment slider by 140 urad, and the M3 witness only saw a move of 10 urad.  Today, when we move the slider by 262 urad, the M3 witness osems see a shift of 317urad, so the suspension is actuating now, but seems not to have been in May.