Infrastructures (Electrical installation)swinkels - 11:48 Monday 03 August 2009 (24036)
Print this reportUnlock investigationLooking a bit more at the unlock Saturday early morning, mostly confirms Rodophe's story. Looking at the magnetometers (which mainly see 50 Hz harmonics), it seems that some big machines are switched off (IPS goes down?), which come back after 7 seconds, see attached graph. At the moment of the switch-on, a glitch is seen in the top-stage accelerometers that give a kick to the top stage. The unlock happens several seconds later due to the saturation of the DAC of the reference mass.
The IMMS signals seem too slow to accurately follow the events. I suggest to install at least one sniffer on the UPS and IPS lines in all the buildings, we should have a few available.
