matthew.evans@LIGO.ORG - posted 21:22, Monday 16 July 2012 (3461)
OAT - noise hunting: CM + VCO are clean
The SR785 reports coherence > 0.999 above 1Hz between the demod board Imon (output monitor) and the VCO monitor. That signal passes through the CM board and the VCO filters, so they are not adding any visible noise.