(Sheila, Corey)

After a recent lockloss, where we were up to 60W (specifically at LASER_NOISE_SUPPRESSION state), Sheila noticed the IMC-MC2_TRANS_SUM_OUTPUT signal (red) on the front PRMI scope took a step up before the lockloss.  She believe this could be ISS-related.  

With the following alog from Jenne in mind (alog #58264), we made some changes to ISS & 2nd Loop channels to try to prevent this "jump" from causing a lockloss.  Here are the changes ( current [before] ):

• H1:PSL-ISS_REFSIGNAL:  -1.797 [was -1.800]
• H1:PSL-ISS_SECONDLOOP_AC_COUPLING_OFFSET:   0.050 [was 0.000].  SDF was ACCEPTED for this change.

Only one data point, but for this current lock, made it and did not see the setp up with the MC2 Trans signal (see attached screenshot for the PRMI scope).