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Entry  Wed May 23 13:57:11 2012, Jenne, Bureaucracy, General, 40m Meeting Action Items 
    Reply  Wed May 23 20:41:37 2012, Suresh, Bureaucracy, General, 40m Meeting Action Items: Tip-tilts : cabling and electronics  
    Reply  Thu May 24 01:17:13 2012, Den, Update, CDS, PMC autolocker 
       Reply  Sun Jun 24 23:42:31 2012, yuta, Update, Computer Scripts / Programs, PMC locker 
          Reply  Mon Jun 25 21:54:52 2012, Den, Update, Computer Scripts / Programs, PMC locker 
             Reply  Tue Jun 26 00:52:18 2012, yuta, Update, Computer Scripts / Programs, PMC locker 
                Reply  Thu Sep 19 18:48:24 2013, rana, Update, Computer Scripts / Programs, PMC locker pmc.png
                   Reply  Thu Sep 19 21:15:44 2013, rana, Update, Computer Scripts / Programs, PMC locker Untitled.pdf
Message ID: 6668     Entry time: Wed May 23 20:41:37 2012     In reply to: 6667
Author: Suresh 
Type: Bureaucracy 
Category: General 
Subject: 40m Meeting Action Items: Tip-tilts : cabling and electronics  

Quote:
..........
  • Tip Tilts
    • Prepare electronics for TTs (coil drivers) - JAMIE
    • In-air TT testing to confirm we can control / move TTs before we vent - SURESH
    • Connect TTs to digital system and controls, lay cables if needed - JAMIE with SURESH
  • .....

 

 [Koji, Suresh]

  We tried to locate the sixteen analog output channels we need to control the four tip-tilts (four coils on each).  We have only 8 available channels on the C1SUS machine. 

  So we will have to plug-in a new DAC output card on one of the machines and it would be logical to do that on the C1IOO machine as the active tip-tilts are conceptually part of the IOO sub-system.   We have to procure this card if we do not already have it.  We have to make an interface between this card output and a front panel on the 1X2 rack.  We may have to move some of the sub-racks on the 1X2 rack to accommodate this front panel.

  We checked out the availability of cards (De-whitening, Anti-imaging, SOS coil drivers)  yesterday.  In summary: we have all the cards we need (and some spares too).  As the De-whitening and Anti-imaging cards each have 8 channels, we need only two of each to address the sixteen channels.  And we need four of the SOS coil drivers, one for each tip-tilt.  There are 9 slots available on the C1IOO satellite expansion chassis (1X1 rack), where these eight cards could be accommodated.

  There are two 25 pin feed-thoughs, where the PZT drive signals currently enter the BS chamber.  We will have to route the SOS coil driver outputs to these two feed-throughs. 

   Inside the BS chamber, there are cables which carry the PZT signals from the chamber wall to the the table top, where they are anchored to a post (L- bracket).  We need a 25-pin-to-25-pin cable (~2m length) to go from the post to the tip-tilt (one for each tip-tilt).  And then, of course, we need quadrapus cables (requested from Rich) which fit inside each tip-tilt to go to the BOSEMs.

   I am summarising it all here to give an overview of the work involved.

 

 

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