Chris,

        The problem that Joey alludes to is that when he "turned the 
pattern around", he failed to have parallel circuits on layers 9 and 10 
(since the circuits on layer 10 were directed the other way).   On the 
layer that is to "turn around", circuits need to exist in both directions. 
  In this manner, the relationship of the initial layer pattern is proper, 
including the layer where the change occurs.   The relationship of the 
layers after the direction change is also proper.   See the images below, 
where the pattern turns around at layer 10:

All layers from 1-10 have the Y pattern pointing to the right;  on all 
layers from 10 through 20, the Y pattern points to the left.
This shows layers 9 (red) and 10 (blue):


This shows layers 10 (blue) and 11 (red):



In this manner, the length of the coupon is able to be shortened while the 
integrity of the test is maintained on all layers.

Thanks,
Lance




From:
Chris Mahanna <[log in to unmask]>
To:
[log in to unmask]
Date:
05/14/2010 02:12 PM
Subject:
Re: [IPC-600-6012] E coupon configuration
Sent by:
IPC-600-6012 <[log in to unmask]>



Hi Joey and Tom.  Just barely-  It's o'beer:30 in these parts.
I agree, don't use that particular script without tweaking it as Joey 
shows.
Dave Corbett suggested that we change to the optional military design.  I 
can't remember where it is drawn at the moment.  The electrodes all lay 
directly on top of each other, and there is no Y (trumpet), but rather a T 
at each layer.  1-10C committee approved this recommendation in Vegas. The 
primary benefit is real-estate.  It will be added to 2221 appendix A 
draft.
Have a great weekend.
Chris



-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Thomas E 
Kemp
Sent: Friday, May 14, 2010 4:36 PM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] E coupon configuration

Yes, we used to build our coupons like that until DSCC slapped our hands 
for the reasons mentioned. The IPC-2221 Coupon sub-committee is looking 
into the feasibility of creating this coupon in this fashion now. Chris, 
are you out there?
Tom



Jose A Rios <[log in to unmask]>
Sent by: IPC-600-6012 <[log in to unmask]> 05/14/2010 03:24 PM Please 
respond to "(Combined Forum of D-33a and 7-31a Subcommittees)" 
<[log in to unmask]>


To
[log in to unmask]
cc

Subject
[IPC-600-6012] E coupon configuration






We noted that our coupon generator flips the direction of the Y circuit 
pattern on the 10th layer to control the length of the E coupon, as shown 
in the 1st screenshot below.


Arguably it may compromise the integrity of the test between layers 10 and 


11, since there is basically no overlapping circuits. Does a re-design 
like the one the 2nd screenshot below violate any coupon design reqts?? 
The 10th plane use wires in both directions so that it is effective in 
testing both against the 9th and 11th planes like this. (Blue is the 10th 
plane, Yellow is the 11th plane, purple-ish is where there is data on both 


planes) 


Has anyone else run into this situation??

Joey Rios
PWB & Process Quality Eng'r
Endicott Interconnect Technologies
1093 Clark St.
Endicott, NY 13760
Office: 607-755-5896

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