http://www.ipc.org/4.0_Knowledge/4.1_Standards/test/2.4.22c.pdf
x% of the diagonal of the work-piece...
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tim Mack
Sent: Wednesday, May 23, 2007 3:18 PM
To: [log in to unmask]
Subject: [TN] PCB Flatness
Does anybody know how "flatness" is measured as it relates to circuit
board
fabrication? I was told that the boards I am ordering would have a
flatness
of less than 0.5%. 0.5% of what? Any help would be appreciated.
Thanks,
North Dakota State University
Center for Nanoscale Science and Engineering
Tim Mack
www.ndsu.nodak.edu/cnse
Research Engineer
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