After testing in 72959, TJ and I injected a 45Hz G=30 sine wave into H1:TCS-ITMY_CO2_PZT_OUT_GAIN_EXC while we waited for the ADS lines to converge to go into Observing. Excitation on from 2023/09/19 21:14:14 UTC and Gain = 30 from 21:15:30 UTC to 21:21:08 UTC.

We could see this line and some harmonics in DARM, plot attached. Daniel points out that this isn't useful unless we understand how much of a signal we are injecting...

I didn't save the signal on the H1:TCS-ITMX_CO2_LSRPWR_{HD,MTR}_OUT channels (not DQ'ed) and we will also need to understand how much of a 45Hz signal these thermal powermeters would convert and see.