aLIGO LHO Logbook

H1 ISC (DetChar)

sheila.dwyer@LIGO.ORG - posted 01:03, Wednesday 11 February 2015 - last comment - 08:08, Wednesday 11 February 2015(16626)

Spectrogram of DARM ERR?

We have seen in our two DC readout locks tonight what looks like it could be a fringe wrapping shelf in DARM.

We transitioned to DC readout at 8:43:06 UTC Feb 11 and it is still locked. If anyone could make a spectrogram of LSC-DARM_ERR durring this time, that would be interesting. We made an attempt to do this using ldvweb, but didn't suceed yet.

Comments related to this report

thomas.massinger@LIGO.ORG - 05:11, Wednesday 11 February 2015 (16632)DetChar

Link

I've attached 4 spectrograms of DARM_IN1_DQ:

1. 20 minutes elapsed
2. 20 minutes elapsed normalized (divided by median ASD)
3. 1 hour elapsed
4. 1 hour elapsed normalized

I'd be happy to make a few more if ldvw is still being problematic for you.

Images attached to this comment

duncan.macleod@LIGO.ORG - 08:08, Wednesday 11 February 2015 (16640)

Link

The summary pages are automatically generating calibrated spectra/spectrograms of the CARM and DARM error signals whenever the ISC_LOCK guardian is 'OK'.