[Halld-tracking-hw] FDC Wire boards

[Fernando J Barbosa]

Hi Eugene, Lubomir,

I reviewed the Gerber files for the FDC wire boards and compared the 
production versions (the ones now installed ) and the recently purchased 
boards.

There are 5 board types:

a) 1000 & 1003 - these are the filler boards on the sides with just 
grounds - No mechanical differences, no electrical differences, wider 
gold plating on the outer periphery of the board.
b) 1001 & 1002 - these are the boards that carry the preamps - No 
mechanical differences, wider gold plating on the outer periphery of the 
board. A couple of traces on top and bottom layers are on the wider gold 
plating area but no other electrical differences. Note that these traces 
are no longer used as they were intended for serial temperature readout 
which is no longer implemented. I recommend applying a layer of 
conformal coating to these traces in the gold plated area due to the 
grounding implementation, though.
c) 1004 & 1005 - these are the HV boards - No mechanical differences, no 
electrical differences, wider gold plating on the outer periphery of the 
board.

All the boards are mechanically identical in size, hole locations, etc. 
As usually done, vias must be conformally coated where necessary prior 
to lamination.

Please proceed with assembly.

Best regards,
Fernando




On 8/22/2012 4:42 PM, Lubomir Pentchev wrote:
> Dear all,
>
> We will have our FDC meeting tomorrow in F326 at 1:30pm.
>
> Lubomir
>
> Agenda:
>
>      1. Production (Dave)
>             * Cathodes
>             * Third package
>      2. Cathode corrosion
>             * Results from SEM analyses
>             * Test chambers
>      3. Engineering (Dave)
>             * Cathode strong-backs
>      4. Electronics (Chris, Nick)
>             * PCBs
>      5. TDR (Lubomir)
>      6. Other
> _______________________________________________
> Halld-tracking-hw mailing list
> Halld-tracking-hw at jlab.org
> https://mailman.jlab.org/mailman/listinfo/halld-tracking-hw