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Subject:	Re: fab: Multilayer Test Coupons
From:	David Bergman <[log in to unmask]>
Date:	Thu, 10 Oct 1996 13:26:39 -0500 (CDT)
Content-Type:	TEXT/PLAIN
Parts/Attachments:	TEXT/PLAIN (54 lines)

John there isn't a different specimen.  IPC-A-27 was used as the 
qualification board for MIL-P-55110C.  My understanding was that as long 
as you could build the 10 layer board, the military felt you were able to 
handle larger layer counts.  Therefore, no additional higher layer count 
pattern was developed.

BTW, IPC-A-27 was replaced with IPC-A-43 as the 10-layer qualification 
pattern for MIL-P-55110D. The same logic above still applies.

Regards
__________________________________________________

David W. Bergman, V.P. of Technical Programs
IPC
2215 Sanders Road
Northbrook, IL  60062-6135
847-509-9700 x340 Phone
847-509-9798 Fax
email  [log in to unmask]
www  http://www.ipc.org
faxback support 800-646-0089
---------------------------------------------------

On Thu, 10 Oct 1996, John Parsons wrote:

> We are currently manufacturing M/L boards up to 10 layers.  I noticed that
> the IPC Multilayer Test Pattern (IPC-A-27) is for 6 or 10 layer boards. 
> What is used for layer counts in excess of 10 layers?  Are the coupon
> sections simply expanded and repeated to accomodate higher layer counts, or
> is something different used?
> 
> Regards
> John Parsons
> Circuit Graphics Ltd.
> 
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