J. Kissel

Though we turned off the 1083.7 Hz calibration line last night (LHO aLOG 30476) because we were worried about range in the PCAL systems Optical Follower Servo (OFS) after increasing other calibration line amplitudes. However, as a quick test, I turned it back on. With the increased amplitude of other CAL lines, and this 1083.7 Hz line ON, the OFS does not saturate, so it appears we have enough range to run it all. I've also made a quick check of the calibration line harmonics to be sure those are not huge, and still well below the DARM sensitivity, and they are. Nice!

We want this line ON, so it serves as a clean reference for the optical gain while we perform the high frequency, long duration sweeps (i.e. LHO aLOG 30434).

I've accepted the change in the SDF system.