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Entry  Tue May 28 17:00:50 2013, Jenne, Update, ASC, Proposed POP path, to be installed this evening CurrentPOPpath.pdfProposedPOPpath.pdf
    Reply  Thu May 30 17:18:58 2013, Jenne, Update, ASC, New POP path 
       Reply  Sat Jun 1 14:14:56 2013, Jenne, Update, ASC, New POP path POX_table_30May2013progress.pdfPOP_QPD_lensSolution.png
          Reply  Fri Jun 14 03:10:40 2013, Jenne, Update, ASC, New POP path - PDs in place, need cabling 
             Reply  Fri Jun 14 17:54:11 2013, Jenne, Update, ASC, New POP path - cabling work 
             Reply  Wed Jun 19 22:02:03 2013, Jenne, Update, ASC, New POP path - ready to try 
Message ID: 8710     Entry time: Fri Jun 14 17:54:11 2013     In reply to: 8707
Author: Jenne 
Type: Update 
Category: ASC 
Subject: New POP path - cabling work 

Quote:

... I need to ... lay some cables between the supply/readout box and the IOO chassis (where Jamie has freed up some channels for me).

 I have made 3 dongles that go from 2-pin lemo to BNC so that I can connect the 3 QPD signals (X, Y, Sum) to the IOO ADC (Pentek Generic board in 1Y2, which also has the MC channels). 

The interface board with the 2-pin lemo connectors doesn't have anything in the DCC for the document number (D020432), so I asked BAbbott, and he said: "After a bit of searching, I found that on psage 2 of D020006-A-pdf ( https://dcc.ligo.org/LIGO-D020006-x0 ), Pin 1 of each LEMO connector is the + leg, and pin 2 is the - leg.  This means that you should connect the center conductor of the BNC (if you don't have any 2-wire twisted-pair cables around) should be connected to pin 1 of the LEMO, and the outer conductor should be connected to Pin 2.  According to http://il.rsdelivers.com/product/lemo/epg0b302hln/2-way-size-0b-pcb-mount-socket-10a/1305621.aspx Pin one is the top one on the right-angled LEMO."  According to page 50 of the lemo data sheet, pin1 is the one with the mark next to it, when you are looking at the solderable end.


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