YuhangZhao - 00:16, Saturday 19 September 2020 (2215)
Comment to Check WFS error signal in time (Click here to view original report: 2213)
According to the WFS error signal in time, it can be inferred that situation of QPDs location is shown in the attached figure.
In this case, the error signal from input mirror is shown with opposite sign on QPD1/2. While the error signal from end mirror has the same sign.
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