Reports until 17:37, Thursday 24 January 2019
H1 SQZ (SQZ)
nutsinee.kijbunchoo@LIGO.ORG - posted 17:37, Thursday 24 January 2019 - last comment - 11:26, Friday 01 February 2019(46630)
Begin swapping SQZ locking scheme

Slow output to the laser is now coming from the PFD TTFSS. That part seems to be working fine. I can't seems to stop the error signal from saturating. I stacked 20+10 dB attenuator at the RF input but no luck. RF mon is showing the 158MHz beat note at -22dBm on the RF spectral analyzer. The power okay icon shows read and the beat note strength read back is wrong. 

 

Also attached drawings of what we had and what's supposed to happened next (with doodles on it).

Images attached to this report
Comments related to this report
daniel.sigg@LIGO.ORG - 10:21, Friday 25 January 2019 (46638)

HV was off.

terry.mcrae@LIGO.ORG - 11:26, Friday 01 February 2019 (46746)

Note in drawing 2 the output "PZT Driver (Ch3) U15" should also be crossed out.