~7kHz would be close to the cross over frequency wouldn't it? Maybe also see if you can capture PZT and EOM actuation signals in the same sweep (at their full bandwidth, i.e. careful of the montors filtering things off at higher frequencies).
Also, an aside: you might want to also tar and attach data + plotting to elog as url links rot over time.
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After the vacumCans are heated, I aligned the north cavity again today to about 60% mode matching. however, I'm seeing a weird oscillation in the mixer channel of FSS board which is very big (5 Vpp) and is happening alongside a large power fluctuation in transmitted light. See attached plot from oscilloscope of reflected DC level and the micer channel from FSS. The repition rate of the oscillations make this a 7.35 kHz noise. I have never seen this before. Further, these oscillations are completely unaffected from chaning COM gain or the Fast gain in the FSS path. Comments required.
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