This week, I tested the ETMX UIM P2P and Y2Y filters (described in alog 10912). The results are showing that filters are working as expected giving a single pendulum transfer function falling at 1/f^2 after the resonnance (f=0.45Hz for pitch, f=0.6Hz for yaw). Also the coupling between pitch and yaw is small (~5%) so unless this is too much, there's no need for diagonalization for UIM.

Attached pdf are showing P2P P2Y (first pdf) Y2Y Y2P (second pdf) transfer functions with/without the filter.

Left to do for next week :

ETMX : Long decoupling on UIM/PUM

• measure UIM L2PY for long decoupling 
• measure PUM L2PY for long decoupling

ETMY

• Install/comission oplev on ETMY
• Balance UIM/PUM coils
• Measure top to test mass L2PY P2PY Y2PY
• Measure UIM to test mass L2PY P2PY Y2PY
• Measure PUM to test mass L2PY P2PY Y2PY

ITMX/ITMY

• Measure/invert UIM P2P Y2Y