Until the guardian installation, I've been asked to write a quick procedure on how to turn back the BSC-ISIs on after a trip.

Right now, the best configuration for BS, ITMX, ITMY and ETMX is the same: lvl3 controller on ST1 and ST2, Tcrappy blend filters on ST1 and ST2. No sensor correction.

- Reset the watchdogs

- Check that HEPI position loops are still on

- Open the ST1 CART BIAS screen and click on Reset CPS offset then Store target offsets

- Open the commands screen and click on !Isolate <CHAMBER> lvl3

- A black xterm window will show up. While this pop-up window is there, don't touch anything.

- The isolation loops are now on. Next step is to switch to the good blend filters. Wait for the T240 signals to go down! The overview T240 indicator has to be ALL GREEN before doing anything.

- When you think the platform has settled down, open ST1 BLEND screen -> SWITCH ALL and select Tcrappy.

- If this process makes the ISI trips, that means you haven't waited long enough. Restart the all process. A trick that could work is to start switching the vertical blend filters (Z, RX and RY) first, then the horizontal ones (X, Y, RZ).

- Repeat the same process with ST2 BLEND.

Remember that we are dealing with seismic signal and very low frequency instruments. Be patient!