Sheila found that H1:TCS-ITMX_CO2_ISS_CTRL2_OUT_DQ stepped up from -0.2 to 0 on 2024/12/05 21:40:07 UTC (13:40 PST) Plot attached. This is of interest as this channel has ben a witness to our noisy/low range periods in DARM but is not connected to anything. I see no reason for this step up, the only person in the LVEA at the time was Robert setting up VP measurements (near HAM3 not CO2X) 81628, the CO2 laser remained l locked and we were not touching the CO2 chiller around the time 81634.
Since this step up, this channel has not been a good witness of our DARM noise, maybe the cable wasn't grounded and something changed to ground it on 12/05. Plot of it being a witness to the noise on 12/02 and not on 12/11.
Before and after the step up, this CO2 channel is still a witness to the CO2 rotation stage moving, attached. Both CO2X and CO2Y ISS CRTL2 channels see the rotation stages move, some crosstalk in chassis? CO2Y signal is orders of magnitude larger. Jason was looking into these channels and the chassis
I don't see any change in the H1:TCS-ITMX_CO2_RIN_INLOOP_OUTMON channel at that time, but the reason for the step in the CRTL2 output is from a turned off digital offset in the H1:TCS-ITMX_CO2_AOM_SET_POINT bank. I turned this off when we were looking at it and I forgot to alog it, apologies.
Curious that we lost sensitivity to whatever this is when an offset was removed, but I think this is a good clue.
I've just put the offset back in just to see if we get our "monitor" back. Accepted in safe and observe snaps, but only one screenshot.
It seems that with the offset on again, this channel is again a witness of the noisy times.
