John - 

You can use either value, but I would recommend using the finished value
for most applications. More important than which value you choose, is
that you work with your fabricator,  letting them know the assumptions
you made to derive your values. They may [more than likely will] need to
adjust your design values to meet the intended impedance values you
specify.  


Jeffrey McGlaughlin, CID 
Engineering Designer EAS 
4-2-50 room 
x-7582 Phone 
(614)458-7582 Fax 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Babcock John
Sent: Friday, December 09, 2005 12:59 PM
To: [log in to unmask]
Subject: [TN] External Plating - Impedance Calculation

Hi All,
 
When figuring impedances with the field solvers...for the external layer
copper thickness does one enter the finished plated value or the
unfinished?
 
If you specify a top and bottom layer as 1.5 oz plated to 2 oz, which
value would you put into the field solver for the impedance calc?
 
I would figure you put in the finished plated value...but not positive.
 
Thanks!
 
John
PCB Designer III
Isothermal Systems Research

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