[Halld-pid] start counter orientation

Beni Zihlmann zihlmann at jlab.org
Tue Sep 26 10:21:40 EDT 2023


HI All,

regarding our lack of understanding of the "orientation" of the start 
counter, I realized yesterday that the signal cables
(3 for each card serving 3 paddles) are connected to the patch panel 
with lemo connectors and nicely labeled, so no
confusion there. However, on the other end, the signals are "soldered" 
directly to the board an there are no labels on
  the cables! The only label on that side is a small "sticker" on the 
pcb board.
So every time the start counter is dismounted from the target these pcb 
boards need to be disconnected and the cables
have to be moved back. So the signal cables "follow" with the pcb board 
and if the pcb board would be connected to
a different position would mean the detector numbering would too.
Unfortunately, on the earlier photos the sticker on the pcb boards are 
not legible and therefore it is not possible to
check where a certain pcb board was connected to.
We may try to find pictures that show these pcb boards where the 
stickers can be read.

cheers,
Beni




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