Here is how the PR3 and SR3 signals show up at various ports.
I drove a pitch line from PR3 M3 and SR3 M3 at 8.125 Hz with the ASC notches on. I was able to see at signal with a 10 ct drive on PR3 pitch and 60 ct drive on SR3 pitch.
Templates saved as {PR3,SR3}_M3_injection_all_ports.xml in /ligo/home/elenna.capote/POPX_test in case the data is useful to you.
PR3 appears strongly at REFL and POP in I and at AS in Q. SR3 appears strongly at AS in Q and POP in Q.
Will try to repeat for yaw.
I ran these same injections for PR3 and SR3 using 10 ct excitation for PR3 yaw and 60 ct excitation for SR3 yaw. I also reran the SR3 pitch injection with a 100 ct injection to see if I could better resolve the signal in the REFL WFS as a did for yaw but that did not seem to do much.
It appears that SR3 yaw shows up strongly in the REFL WFS, contrary to pitch. I'm remembering that there was a proposed scheme in T0900511 that controls the SRC alignment through sensing SR3 motion on the REFL45Q signal.
