Sheila, Kiwamu, Evan

Using the same method as described here, we determined that the switching of the ETMY ESD low-pass filter appears to be working fine and is compensated for correctly in the ESD output filters. With offloading turned off and DARM controlled by ETMX, the transfer function ETMY L3 LOCK L → DARM IN1 is identical in both LPF states. It very similar to the transfer function ETMX L3 LOCK L → DARM IN, up to a constant factor of −50. This is a little mysterious to us, since we expect only a factor of 20 at dc between the high-range driver and the LVLN driver.

Anyway, we partially transitioned control of DARM to ETMX and ETMY (we had them actuating with about equal strength), and then saw that the ETMY ESD drive rms was about 30 000 ct, with most of the counts coming from the 322 Hz and 538 Hz calibration lines. We turned the line amplitudes down by a factor of 10 (from 2 ct to 0.2 ct). However, h1susb123 went down right as we were about to complete the transition to ETMY.