Daniel, Nutsinee

OPO didn't lock last night because it couldn't find a dual resonance. The OPO scan starts from 60V to 110V but it should have been 20 to 70V. The lock point prior to down time the dual resonance was found at 64V. We started scanning too close to the lower threshold. After several failures the OPO guardian went to idle and stopped trying for the rest of the night. 

An instruction to ops:

Next time the IFO loses lock, please go to sitemap > SQZ OVERVIEW > SQZT7 > OPO PZT and drag the PZT offset slider bar to 0. See screenshot attached.