peter.king@LIGO.ORG - posted 08:10, Thursday 17 January 2019 - last comment - 17:55, Thursday 24 January 2019(46498)
FSS measurements (continued)
Following on from yesterday's attempt. I made transfer function and spectra measurements with the input modecleaner locked and
unlocked. In summary, there wasn't too much difference in the noise spectra above 100 kHz with the input modecleaner locked
or unlocked.
Attached are transfer function measurements when the input mocdecleaner was unlocked and locked respectively (IMCULKD1.tif,
IMCLKD1.tif). The noise spectra measurements are IMCULN1.tif and IMCLN1.tif respectively. The mixer calibration was measured
to be 1.93/77.4 V/kHz.
More to follow ...
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mxr_imc.txt: FSS mixer monitor signal from 100 Hz to 2 MHz, measurement taken with 4395A and active probe
plotted as hfmxr.png
c1.txt: mixer monitor signal at the carrier, zoomed in
plotted as carrier.png
MXR[1-4].txt and MXRIMCL[1-4].txt: FSS mixer monitor signal from 10 Hz to 100 kHz, measurement taken on
SR7855, plotted as mxr.png
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I stitched and calibrated Peter's FSS mixer data with IMC locked from the SR785 and Agilent together, multiplying the Agilent spectrum by a factor of 25 to get them to match up.
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