Recall from my alog yesterday, https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12292 that we had a broken receptacle 5 on the ESD connector connected to the CP optic which we made a repair on.  Today, Filiberto and I tested each of the 5 ESD connections from the CP solder joints on the gold traces to the air side of the feed thru at the chamber flange.  After another minor fix to a pin, we can

1) confirm continuity from the optic connector to the air feed thru on all 5 ESD channels

and

2) confirm that the test method is quite painless considering it is at the optic (likely Filiberto had the harder job juggling meters up on a ladder in cramped quarters outside the chamber).

Details:

Yesterday we noticed receptacle 5 broken, and we were able to pull it through and pop it into place.  During that fix, we realigned some of the other pins that looked to be buckled or too tight a little.  I think we over-open receptacle 3, which then made it fail the continuity test today.  Closing receptacle 3 down and reseating the connector made all 5 continuity tests pass.  I touched one end of a piece of cleaned copper wire to each ESD solder joint on top of the optic while holding the other end to the metal structure.  Simultaneously, FIl looked at each of the 5 pins outside to find the one with continuity.

Here's the mapping, which conforms to Kissel's G1400578 report:

LR -> Pin 1

UR -> Pin 2

DC Bias -> Pin 3

UL -> Pin 4

LL -> Pin 5

ESD LL, UR, LL, UL Quadrants are specified as viewed from the back of the CP.

ESD pins are specified as viewed from the 5 pin feedthru connector on the outside of the chamber.