Carl,

Is the trace to be used as a resistor going to be on an outerlayer or on an
innerlayer?

David Hoover   (aka, Groovy)

http://home.earthlink.net/~dhoovy
----- Original Message -----
From: "Carl VanWormer" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, December 24, 2003 7:16 AM
Subject: [TN] Question on 2-oz Copper uniformity for current sense resistor


> I have a project that seems to be a good candidate for a current sense
> resistor made as a part of the PCB.  I am using the free calculator,
> PCBTEMP, from the UltraCAD website (http://www.ultracad.com/calc.htm) for
> geometry calculations. I need to know the expected variability in
thickness,
> batch to batch, for the copper foil on 2-oz stock.  I can live with the
0.4%
> TC of the Cu, but I need to evaluate all the other variables in my error
> budget before I present my proposal.  I would appreciate any success (or
> horror) stories from people who have (not) used the board copper as a
> current sense method.
>
> Thanks,
> Carl
>
>
>
> Carl Van Wormer
> Cipher Systems
> 1815 NW 169th Place, Suite 5010
> Beaverton, OR  97006
> Phone (503)-617-7447    Fax (503)-617-6550
>
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