Cortland,
The holes or slots may also be required to meet the Maximum unpierced
conductor area requirement of UL796 Standard for Printed-Wiring Boards for
your particular PWB supplier. In the UL Recognized Component Directory (vol.
3, ZPMV2) it is listed as Maximum, Area, Diameter, Inches.
Regards,
Larry Merchell
Taiyo Yuden (USA), Inc.
San Marcos, CA
-Original Message-
From: Cortland Richmond [mailto:72146@compuserve.com]
Sent: Wednesday, January 24, 2001 8:38 AM
To: Debbie Mallory; ieee pstc list
Subject: Re: FW: [Fwd: [SI-LIST] : Copper balance]
Debbie,
Doug Powell explained it as venting, where slots or holes are added to a
plane in order to let vapor out. However, it is my belief that this is also
done to keep copper balanced during the etching process. I may well be
mistaken, but the EMI and signal integrity concerns we have with the
practice are all valid.
Cheers,
Cortland
== Original Message Follows
Date: 23-Jan-01 07:25:06 MsgID: 1077-23952 ToID: 72146,373
From: Debbie Mallory INTERNET:debbie.mall...@fibre.com
Subj: FW: [Fwd: [SI-LIST] : Copper balance]
Chrg: $0.00 Imp: Norm Sens: StdReceipt: NoParts: 1
From: Debbie Mallory debbie.mall...@fibre.com
Subject: FW: [Fwd: [SI-LIST] : Copper balance]
List-Post: emc-pstc@listserv.ieee.org
Date: Tue, 23 Jan 2001 07:21:35 -0800
Cortland,
I, too, am having problems passing radiated emissions because of 350Mz
originating from a 50MHz processor that uses a 50MHz oscillator. I thought
I understood thieving until you said you have to put it on the ground plane
also. Can you explain further why and how thieving is applied to the
ground plane?
Thanks.
Regards,
Debbie Mallory
Advanced Fibre Communications
Largo, FL
== End of Original Message =
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