Barbara, the answer is yes.  It does help.  If we see a need for
     "copper thieving" to prevent warping, we end up calling the customer.
     This always causes delays.
        As far as the type, we use a 50 mil square on 100 mil centers and
     keep the square anywhere from 20 to 50 mils from any feature.

     John Anselmo
     Hadco - Tech Center Austin
     512-246-5616


______________________________ Reply Separator _________________________________
Subject: [TN] Balanced construction....
Author:  Barbara Burcham <[log in to unmask]> at smtplink-hadco
Date:    12/2/99 8:51 AM


Hey Ya'll,
      The subject has come up....why add copper to signal layers in a
multilayer board if it has no electrical function?
I am in the habit of filling open areas with copper to prevent board
warpage. This does work, doesn't it?
Should copper fill be solid or hatched? Or does it matter?

Help a designer/Help an engineer.

Thanks,
Barbara J. Burcham, CID
PCB Designer
Fairfield Industries
Sugar Land, TX 77478
281-275-7687 Work
281-275-7550 Fax
[log in to unmask]

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