Abstract:

PRM BF GAS seems rubbing somewhere when PRM GAS key stone is going to lower.
Also, SF GAS might have a problem but not confirmed yet.

Detail:

After visual inspection in the morning (it will be posted later, hopefully), I checked the GAS filters motion.
Figure 1 shows the time-series data when moving BF GAS filter.
As you can see, BF GAS signals move only slightly if we applied DAC output betwen -30000 and +10000 cnts while GAS can move several hundreds of micrometers when applying DAC output over 10000 cnts.

Also, I checked SF GAS filter motion by applying DAC output to SF GAS actuator (fig2).
SF motion is much smoother but there are several jumps during the motions.
I have no idea this isrelated to strange response of BF GAS, so this phenomena also needs to be investigated.