40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
 List  |  Find  |  Login  |  Help 
Entry  Sun Jun 10 03:46:38 2018, Koji, Update, IOO, WFS HEAD SW confusion C1IOO_WFS_HEADS.png
    Reply  Mon Jun 11 22:46:24 2018, Koji, Update, IOO, WFS HEAD SW confusion 180611_IMC_WFS1.pdf180611_IMC_WFS2.pdf
       Reply  Thu Jun 14 00:46:09 2018, rana, Update, IOO, WFS HEAD SW confusion 
Message ID: 13936     Entry time: Sun Jun 10 03:46:38 2018     Reply to this: 13946
Author: Koji 
Type: Update 
Category: IOO 
Subject: WFS HEAD SW confusion 

I was checking on the slow machine channels and found something I could not understand.

On the IOO WFS HEAD screen, there are two sets of 4 switches (magenta rectangles in Attachment 1) labeled 2/4/8/16dB.
But as far as I could confirm with the WFS demod (D980233) and WFS head (D980012) drawings, they are the gain (attenuation) switches for the individual segments.
Their epics variable names are "C1:IOO-WFS1_SEG1_ATTEN", "C1:IOO-WFS1_SEG2_ATTEN", etc...

I confirmed the switches are alive (effective), and they are not all ON or OFF. I wonder what is the real situation there...

Attachment 1: C1IOO_WFS_HEADS.png  99 kB  Uploaded Sun Jun 10 04:47:30 2018  | Hide | Hide all
C1IOO_WFS_HEADS.png
ELOG V3.1.3-