EvanG, Travis, Darkhan,
Today we repeated Pcal end-station measurements at EX, the procedure is described in T1500063. Rough readings from dataviewer and GPS times are given in the attached notes.
The outer beam still show a significan drop in power between Transmitter and Receiver modules, earlier we thought that the beam was not well centered at the input port of the RxPD integrating sphere, but by looking at an outer beam spot with IR viewing card it does not look to be the case (see attached picture).
Earlier this week we took a similar set of measurements, but we suspected that WS/TX when WS is inside of received module were not taken properly and today's measurements were taken as a double-check (LHO alog 24726).
We will post a full report and some conclusions soon.
A generated report (comparison with previous measurements) was uploaded to DCC T1500129-v4.
This report gives us more confidence that our measurements taken on 2016-01-05 (LHO alog 24726) were not made properly, because
on 2016-01-05 the value of RX/WS (not optical efficiency corrected one) changed by ~ 2 %, but
on 2016-01-08 this ratio was back to it's value measured earlier in O1.
The data point for 2016-01-15 will need to be removed from future end-station measurement reports.
During Pcal end-station TxPD and RxPD measurements the ETM must be aligned.
This conlog is made to confirm that ETMX was aligned during measurement process.
