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Reports until 16:50, Monday 27 January 2014
H1 SEI (INS, SEI)
jim.warner@LIGO.ORG - posted 16:50, Monday 27 January 2014 - last comment - 09:44, Tuesday 28 January 2014(9581)
HAM4 DTT tf's versus Matlab

Still no resolutions to the problems with HAM4 ISI transfer functions. I took more DTT tf's today, and they all look a little better than the Matlab tf's. The attached plot shows the 3 vertical pods. The 3 thinner lines are the Matlab tf's (which, though not shown, have been repeated 3 times, all 3 times look pretty similar) and the 3 thicker lines (red, green and blue) are the same sensors with a DTT whitenoise tf.

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jim.warner@LIGO.ORG - 09:44, Tuesday 28 January 2014 (9601)INS, SEI

I should add that the H3 GS-13 looks bad, no matter what. It's just hard to see against the general awfulness of the vertical GS-13's.  The first attached image shows the DTT tf in the .5 hz to 5 hz range on the H3 GS13. There should be a taller, pointier peak at ~1hz, which is now kind of squashed. Second image is the power spectra for all GS13s, H3 doesn't look exactly the same as the others at higher frequencies, but not bad. All the other sensors look okay.

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