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Reports until 18:59, Monday 17 June 2013
H1 SEI
fabrice.matichard@LIGO.ORG - posted 18:59, Monday 17 June 2013 (6784)
HEPI BS offset after power outage
HEPI BS showed large offsets in H4 (~ +25000 counts) and V4 (~ -30000cts) after power outage. We disconnected the valve from the driver to check the electronics, they are fine. We closed the valves, and the offset dropped so we suspect something wrong with the Parker valves.

After playing for a while with offsets, H4 eventually dropped back to normal (8000 counts). We are driving V4 actuator overnight hoping to "unlock" this one as well. We are driving with 50s cycles, a bit below the channel frequency so that the actuator follows the drive and fluid circulates in and out. We'll check the offset tomorrow morning.



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