keita.kawabe@LIGO.ORG - posted 18:46, Tuesday 29 August 2017 - last comment - 10:29, Wednesday 30 August 2017(38439)
Timing errors
We started having timing errors about 10 hours after the conclusion of O2, and today we started having end station timing errors at the same time at around 16:30 UTC or 9:30 local time. It seems like the end station witness GPS units are not locked.
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The GPS timing error is due to a change of the default mode. LLO uses Position Hold, whereas the LHO units are configured for 3DFix. We need to reconfigure our GPS units to use Position Hold. Bottom line: GPS units work fine.