Hi Jim
You got good feed from Alain, Earl and Kelly .
That is from the fab side of the story .

You can double edge this (coupon) tool ;
if you integrate to fab coupon (bare board) also your troublesome component
mountings (say caps).
Than you can on the same coupon analyze metalography of joints ;
use them for cycling tests ;
comparative shear tests (process stability on the same/different parameters
[say different effects of various cooling profile scenarios]).
The population (pads/component) you can alter say with any new bare board
revision ;
that way you can plan to target your various woes (say cap pad geometry's) .
Obviously you parallel check your field as well , say cycling your coupons
will give you warning way ahead before it hits you = you can walk to MD
office and tell him he'll have a problem with this batch in 2 years or so
time,
because of this and that = supply service fellows with more clever
alternative before the tsunami in on them .
Concurrent engineering can be warped to limitless scapes ; often you need to
step back to see it .
Something about the trees and forests............

cu

Paul Klasek
http://www.resmed.com



-----Original Message-----
From: West, Jim [mailto:[log in to unmask]]
Sent: Thursday, 14 October 1999 0:23
To: [log in to unmask]
Subject: [TN] Specifying test coupons


Hi all,

Thanks to all that responded to my earlier test coupon question.  I have a
few more question, how do you specify test coupons?  What do I tell the
board layout guy?  What do I tell the board house?  Does everyone have test
coupons on all boards or only multilayer?  Any good advice on how to specify
would be great!

Thanks,

Jim West
Manufacturing Engineer

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