2016-12-19 15:46:36 marc.pirello@LIGO.ORG 12/19/2016 - LHO - Modify (Engineering Bay) 12/19/2016 Marc Pirello Modification Description Applied Capacitor Mod E1600292. Replaced 100nF capacitors at C79 and C80 with 2.2uF capacitors of the same rating and dimensions. This unit belongs to 3rd IFO. 12/19/2016 Marc Pirello Acceptance Test Description and Results Measured the voltage noise on the +/-24V rails before and after the mod was applied. This modification eliminated the noise. 2016-12-19 15:48:56 marc.pirello@LIGO.ORG 12/19/2016 - LHO - Modify (Engineering Bay) 12/19/2016 Marc Pirello Modification Description This is an PLL version of the VCO chassis. I applied a 2nd 2.2uF capacitor to C79 and C80 pads on this chassis to eliminate the noise. The PLL version of the VCO requires a 2nd 2.2uF capacitor on each pad. 12/19/2016 Marc Pirello Acceptance Test Description and Results Measured the voltage noise on the +/-24V rails before and after the mod was applied. This modification eliminated the noise.