I tested different configurations of blend and isolation filters. To do so, I looked at the GS13 input in cartesian basis in the following configurations:

• No Damping
• Damping only
• Damping + Blend 900mHz + ISO level 1
• Damping + Blend 500mHz + ISO level 1
• Damping + Blend 250mHz + ISO level 1
• Damping + Blend 900mHz + ISO level 2
• Damping + Blend 500mHz + ISO level 2
• Damping + Blend 250mHz + ISO level 2

The blend filters used are the generic ("old" version) blend filters from SVN revision 6036.

Spectra are attached. Damping + Blend 500mHz + ISO level 1 et Damping + Blend 500mHz + ISO level 2  are not displayed to keep the plot readable. They are however saved under DTT.

I used the command window to switch between states. The Watchdogs (ISI,SUS,IOP) did not trip. Damping + Blend 250mHz + ISO level 2 was on for a couple hours without any WD trip. I then tested other configurations.

Comments on performace:

• RX and RY amplify too much in low frequencies. They need to be reviewed.
• Isolation is starge on Z and needs to be reviewed.
• Level 2 + blend 900mHz is unlikely to provide such isolation. It is probably a legend mistake.
• LLO used newer blend filters (SVN revision 6187). The SEI team will asses the optimisation and homogenization of blend filters accross sites next week. Meanwhile, I will be testing LLO's current blend/isolation filters .