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Entry  Wed Sep 16 03:44:18 2015, Koji, Update, LSC, RF micky mouse IMG_20150915_231038191.jpgIMG_20150915_234257144.jpg
    Reply  Thu Sep 17 17:27:01 2015, gautam, Update, LSC, RF micky mouse - dodgy DIN connector blocks fixed DIN_rail_terminal.jpg
       Reply  Thu Sep 17 19:42:43 2015, Koji, Update, LSC, RF micky mouse - dodgy DIN connector blocks fixed IMG_20150917_190635033.jpgIMG_20150917_192551919.jpg
       Reply  Fri Sep 18 08:03:53 2015, rana, Update, LSC, RF micky mouse - dodgy DIN connector blocks fixed 
       Reply  Fri Sep 18 08:04:09 2015, rana, Update, LSC, RF micky mouse - dodgy DIN connector blocks fixed 
Message ID: 11613     Entry time: Thu Sep 17 17:27:01 2015     In reply to: 11605     Reply to this: 11614   11616   11617
Author: gautam 
Type: Update 
Category: LSC 
Subject: RF micky mouse - dodgy DIN connector blocks fixed 

[Steve, gautam]

We fixed the problematic DIN connectors on 1Y2, by swapping out the 3 DIN connector blocks that were of the wrong type (see attached image for the difference between the types appropriate for "Live" and "Ground").

Before doing anything, Eric turned the Wenzel multiplier off. We have not turned this back on.

Then we turned off the power supply unit at the base of 1Y2, removed the connectors from the rail, swapped out the connectors, reinstalled them on the rail, and turned the power supply back on. After swapping these out, we verified with a multimeter that between each pair of "Live" and "Ground" blocks, there was ~15V. We could now use the third unused pair of blocks to power the delay line phase shifter box, though for the moment, it remains powered by the bench power supply. 

Quote:

1. POP110 RF amps are powered from the cross connect. But that +15V block has GND connections that are not connected to the ground.
    i.e. The ground potential is given by the signal ground. (Attachment 1)

    This is caused by the misuse of the DIN connector  blocks. The hod side uses an isolated block assuming a fuse is inserted.
    However, the ground sides also have the isolated blocks

2. One of the POP110 RF cable has a suspicious shiled. The rigidity of the cable is low, suggesting the broken shield. (Attachment 2)

 

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DIN_rail_terminal.jpg
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