Here is a Bruco scan using a LDVW default settings, with max frequency 200 Hz (plots only go up to 200 Hz, but webpage has info above 200 Hz): https://ldas-jobs.ligo.caltech.edu/~ldvw/bruco/evan.goetz/H1-CAL-DELTAL_EXTERNAL_DQ_2019-04-07-04.00.00-180/results/ Some notable features (some different compared with Gabriele's last Bruco in late March): - Lots of coherence 5-20 Hz with OMC-DCPD_NULL_OUT_DQ - Second channel with lots of coherence in 5-20 Hz band and the ~35 Hz calibration lines is very frequently ASC-AS_A_RF45_Q_SUM_OUT_DQ - Some regions with marginal coherence (~0.45) with PEM-EX_MAG_EBAY_SUSRACK_Z_DQ
Thanks Evan,
The first two channels (NULL and AS 45 SUM) are just witnessing DARM, so they should probably be added to the excluded list for BRUCO.
The magnetometer could be picking up the DARM signal being sent to the suspensions, but I am not sure.