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Wed, 6 Oct 1999 07:42:34 -0700 |
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hi,
is the cross-section based on artwork and plating requirements or based on a
measurement taken from a metallurgical mount?
phil
-----Original Message-----
From: Nicholas LAI [mailto:[log in to unmask]]
Sent: Tuesday, October 05, 1999 6:37 PM
To: [log in to unmask]
Subject: [TN] Resistance of trace
Hello all,
Is there anyone can answer the following question.
When we calculate the resistance value of an trace on a PCB Board.
We use R=£ll/A where l is the line of trace, A is the coss-section area of
the
trace and £lis the presistivity of copper.
After we measure of the board, the actual resistance value is larger than
the
Theorical value around 20% . Why the different is so larger. Do I use the
wong
formula?
Can anyone help on me?
Best Regard,
Nicholas Lai
10/6/99
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