J. Kissel

Jennie and Sina's work were measuring DARK noise of the SPI PDs yesterday (aLOG pending) and neglected to unshutter the light going into the SPI system. I un-shuttered the light by hitting the H1:SYS-MOTION_C_SHUTTER_N_OPEN button linked from the top-middle of the overview screen. The SPI was dark from 2026-08-31 21:13 UTC to 2026-09-01 16:58 UTC.

Also, I reset the phase unwrapping in the SPI L IFO PD signal processing.

I also turned OFF the H1:SPI-H23_OL_QPD_{A,B}_SEG{1,2,3,4}_OFFSET offsets that were used to replicate the SUM on the QPD when there's no light present, but accepted the values in SDF.