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Kiwamu, Stefan, Sheila

We again tried the the ESD feed-back - see title for conclusion:

In detail:
 - We patched the UIM transfer function above 2Hz with a LISO fit.
 - We verified the sign of all 3 involved states - they are all negative.
 - We checked the measured transfer functions against the suspension model - they looked all right.
 - We checked the model (assuming ideal inverted plants) for proper x-ing (plot attached).
 - Trying to engage the TST drive we ran into TST mass ESD saturations at 0.5Hz.
   The blend high pass still lets signal through at that frequency.
 - We started a detailed transfer function measurement for TST (L3) from 2Hz to 0.2Hz, but were interrupted by a small earth quake.


Remarks:
 - Some useful LISO and foton tools are in ~controls/sballmer/bin:
   - LISO2FotonZPK: convert a LISO fit file into a zpk design string readable by foton.
   - mkfotoncal:  convert a foton zpk design into a list of poles and zeros readable by the DTT calibration feature.