J. Kissel, R. Schofield
WP 5733

Robert and I moved around cabling for the recently re-installed GND STS that has been buried +X (at ~10 m away from the building) of the ETMY building. This STS (S/N 89921) was formerly in the vault during O1. Now cabling for this STS is such that the BNCs, from the hostbox outside, go into channels 13, 14, 15 of the PEM BNC AA chassis at the very bottom of the TCS-C1 rack. Out of the back of this chassis, we've installed a new (standard L-Comm) DB9 cable which now goes to the front of the HEPI AA chassis, in U30 of the SEI-C1, in the port marked "27-30." This corresponds to the channels ADC3_[26-28], which have been pre-wired up to go into STS_A at the top level of the EY model. In addition, I've unhooked the top-level GND_STS block from the library, and added three new sets of channels,
H1:ISI-GND_STS_EYBURIED_X
H1:ISI-GND_STS_EYBURIED_Y
H1:ISI-GND_STS_EYBURIED_Z.
Each above channel prefix set has 
- test points stored to frames as "_DQ" (stored at 256 [Hz]), e.g. "H1:ISI-GND_STS_EYBURIED_Y_DQ";
- an EPICs "_MON" channel, e.g. "H1:ISI-GND_STS_EYBURIED_Y_MON";
- the full BLRMS infrastructure with EPICs channels "_BLRMS" with associated BLRMS extensions for the given band, e.g. "H1:ISI-GND_STS_EYBURIED_Y_BLRMS_30M_100M."
The modified top-level model has been committed to the userapps repo.

Because the buried STS readout system has two factors-ot-two differences between the nominal STS readout system (one factor from the fact that only the positive legs of the host box signals are carried in via BNC, and then the other is from reading out this single-ended, half-signal with a differential ADC), I had to create new calibration filters (in FM2 of the H1:ISI-ETMY_ST1_GNDSTSINF_A filter banks, called "Cal_Buried") which multiply the nominal gain (10.1725 [(nm/s) / ct]) by 4 to get the calibration right. Thus, all of the derivatives of the above mentioned channels are calibrated into (nm/s), as is the case for all other GND_STSs.
The modified filter file has been loaded, committed to the repo, and the new FMs have been turned on.

As of Feb 17 2016 at 00:00 UTC, these channels are calibrated and awesome.

Calibrated DTT Template saved as
/ligo/home/jeffrey.kissel/2016-02-16/2016-02-16_H1ISIETMY_GND_STS.xml

P.S. Robert suspects that the best position for the STS is roughly at ~20 [m] from the building because it balances high-frequency drop off of coherence and coupling to building tilt. I.e. 10 [m] is a little too close, so the building tilt pollutes the ~40 [mHz] signal just as much as the STS on the slab, where as at 40 [m], the ~0.5 [Hz] motion is no longer coherent enough to do viable subtraction. So, he may dig one more hole and move it to 20 m, but it'll likely stay put until the next time Robert's in town.