We took some calibration time today to measure the cross over between the PUM and test mass by exciting the L2LOCK filter.  (the PUM and test paths are dominating the response function at frequencies where our calibration is wrong, so it seemed like a good idea to make an independent measurement of this.)

The first attached pdf shows this measurement compared to a model of -C*D*(PUM+UIM)/(1+CDTST) which is In1/In2, as well as the ratio of PUM+UIM/TST, which this is an approximation of. The coherence of the measurement wasn't great, so it might be useful to retake this with more coherence and extend the measurement to lower frequencies.  This measurement would indicate that the cross over is quite stable, but we saw last week that the addition of a 4.5Hz boost makes this unstable at 8Hz (without the L2A decoupling on) 47982. 

Also attached are the plots produced by pyDARM based on the calibration sweeps taken last night after the pcal fix 48206.  These measurements give slightly different fitting results from the set of sweeps taken from March 27th to 31st, but the differences aren't enough to make much of a difference in our overall calibration.