alexan.staley@LIGO.ORG - posted 18:48, Wednesday 03 September 2014 - last comment - 14:31, Friday 05 September 2014(13743)
Green team returns
(Alexa, Sheila, Keita)
- X-arm locked on green (see Keita's alog 13740 for more detail on alighment).
- We had to realign Green REFL B on ISCTEX.
- We plugged the 24.407079 MHz RF oscillator source back to the RF Amp, with the demod phase at 120.6deg. The ifr was set to some wrong value, and we didn't bother resetting it for now. For reference, the HIFOX configurartion was Mod Freq: 24.407363 MHz, Demod phase: 120.7 deg (alog 10227).
- COMM beat note was well aligned on ISCT1, we measured 1.5Vppk.
- DIFF and COMM demod controls cable was plugged into the wrong slot in the back of the concentrator. (We moved from slot 3 to slot 1). This is now consistent with the pull list.
- There is a LO mon error for COMM demod. Will investigate tomorrow.
The LO mon error of the COMM demod came from the fact the the COMM VCO had no RF source reference. I disconnected and reconnected the ALS COMM VCO REF cable to the distribution amplifier and this seemed to have fixed the problem.