peter.king@LIGO.ORG - posted 07:47, Wednesday 20 February 2019 - last comment - 07:54, Wednesday 20 February 2019(47018)
FSS transfer function measurements
With the common gain slider set to 28 dB and the fast gain slider to 15 dB, a round of transfer function measurements
was executed. The input modecleaner was locked when these measureements were taken. The reference cavity transmission
monitor was ~2.7 when the measurements started.
CG28FG15.txt open loop transfer function to 1 MHz (image CG28FG15.tif)
C28F15.txt open loop transfer function to 5 MHz (image C28F15.tif)
TP3A.txt mixer monitor signal to 1 MHz (image TP3A.tif)
TP3B.txt mixer monitor signal to 5 MHz (image TP3B.tif)
One very noticeable thing is that with the new gain settings, the UGF is quite a bit lower than previously measured.
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Additional transfer function datafiles. Input is through TEST2 In, output is at the relevant test point.
TP10-1.txt fast monitor to 1 MHz (image TP10-1.tif)
TP10-2.txt fast monitor to 5 MHz (image TP10-2.tif)
TP9-1.txt PC monitor to 1 MHz (image TP9-1.tif)
TP9-2.txt PC monitor to 5 MHz (image TP9-2.tif)
Both transfer functions look quite odd, and do not resemble those of the spare TTFSS.
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