Reports until 14:46, Wednesday 01 November 2023
H1 AWC (DetChar-Request)
keita.kawabe@LIGO.ORG - posted 14:46, Wednesday 01 November 2023 - last comment - 10:20, Tuesday 07 November 2023(73917)
OM2 heater Beckhoff change, Beckhoff cable is fully connected back to the heter driver

I've done some injections today but I'll alog about that later.

After I was done with the injections, the breakout board was removed from the back of the OM2 heater driver and the Beckhoff cable was fully connected again. This happened at around 21:40 UTC today.

Yesterday during the maintenance, Fernando and Daniel changed the Beckhoff configuration such that the Beckhoff terminal won't switch between thermistor 1 and thermistor 2 (alog 73886). Now it's only reading thermistor 1 (cold one) w/o switching. Thermistor 2 (hot one) is not read out.  Detchar, please see if you can see the comb.

Comments related to this report
ansel.neunzert@LIGO.ORG - 10:40, Sunday 05 November 2023 (74006)
Link

Good news- no sign of the 1.66 Hz comb in Fscan daily spectra after Nov 1 (checked the 2nd-4th).

daniel.sigg@LIGO.ORG - 10:20, Tuesday 07 November 2023 (74051)
Link

Further change: Beckhoff was rewired to use 2 separate terminals to measure the 2 thermistors.