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YuhangZhao - 14:15, Tuesday 22 December 2020 (2316)Get code to link to this report
20201221 2am a sudden position change happened to END mirror

Marc and Yuhang

We found difficulty to align FC on this Monday. Then we checked oplev signals and found a sudden position change for END mirror (figure 1, we didn't find sudden change on INPUT).

By changing DC offset for END, its oplev sensing signals were recovered (figure 2).

Images attached to this report
2316_20201222061619_20201221endchange.png 2316_20201222061625_20201221endrecover.png
Comments related to this report
YuhangZhao - 22:42, Wednesday 23 December 2020 (2317)

The time (around JST 2am 21st Dec 2020) of this sudden change has coincidence with an earthquake.