= ITMX / ETMX =
-- suspension performance of ITMX and ETMX is now being measured using Xarm signals.
-- one mesasurement, force transfer function at TM-stage (like the attached, the units is to be checked) was done and this is to be analyzed.
= Note =
during the measurement, I changed the Yaw position of ETMY suspension so that the AOS-TMSX_IR_PD_OUT had larger value; I changed the Yaw position: from -97.5 to -98. 5 in K1:VIS-ETMX_TM_OPLEV_TILT_YAW_OUTMON, by changing: from 1338 to 1341 in K1:VIS-ETMX_BF_DAMP_Y_OFFSET. more detailes just in case: https://github.com/gw-vis/ETMX/issues/3
-- TO BE CONTINUED maybe in the holiday ...
= ITMX / ETMX =
-- A measurement with Xarm is still ongoing. I'm just showing the plan here:
| Input stage | Input DoF | done / Not yet | Note |
| TM | L | done | |
| P | done | ||
| IM | L | Not yet | |
| V | done | for estimation of V2L coupling | |
| MN | L | done | |
| BF | L | Not yet | |
| GAS | done | for estimation of V2L coupling | |
| IP | L | Not yet | for estimation of vibration isolation performance |
-- The purpose is to assess the performance of the suspensions for ITMX and ETMX.
-- What I'm doing is:
-- to inject sinusoidal noise by sweeping the frequecies from the TEST channels.
-- to measure the coupling to TM-L by looking at (and TM-P, TM-Y)
-- Post about those measured plots are to be followed..
-- Other technical notes are available from:
https://github.com/gw-vis/ETMX/issues/3
https://github.com/gw-vis/ITMX/issues/12
-- This measurement will be terminated on Jan 6th, 2019. Any suggestions will be welcomed.
= Force transfer function =
-- The attachments shows some force-transfer functions of the payloads, measured with X-arm signal.
-- A sinusoidal input was injected into {TM / IM / MN}_L with 'swept sine' option.
-- K1:LSC-MCL_OUT_DQ was used to sense the TM_L motion.
-- The TM_L signal was calculated (calibrated) by:
TM_L = ( K1:LSC-MCL_OUT_DQ ) * (transfer function of the typeC)
-- transfer function of the typeC here is:
-- Then the results are here:
== Issues ==
-- I could not get the sense why the phase difference in TM to TM transfer function of ITMX was sticked to 150 deg.
-- Would anyone please give me any comments what could cause this issue?
-- The unit of the inputs is to be corrected, it is still in counts in the following plots.
-- They are to be compared with the simulated results.
