Oh -- also, forgot to mention IPC-TM-650 (Test Methods) as a good read on measuring characteristic impedance, but my (old) copy has nothing to say about design of test patterns.  -- K



-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Dack.Kelly
Sent: Friday, November 16, 2012 11:48 AM
To: [log in to unmask]
Subject: Re: [DC] Test coupons

Arlene -- I know that I'm way out of date with this spec, but I'm seeing test coupon design rules in the old IPC-2141 spec (1996) Physics hasn't changed much since then, but maybe someone out here can point us to newer information.  Most importantly, you will need to design a pattern that will match the probes of the equipment that will be doing the testing, with lines that have the same geometry as the one's you want to control in your design.

If you are not doing your own testing with your own equipment, you might check with your board supplier who has a TDR machine and is most likely already putting test patterns on the outside edges of your controlled impedance design's panels.  

Hope this helps -- Kelly

______________________________________________________

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Arlene Fox
Sent: Friday, November 16, 2012 11:20 AM
To: [log in to unmask]
Subject: [DC] Test coupons

Hi All,

Can someone tell me if there is an IPC standard that calls out the requirements for an Impedance Test Coupon.

Thanks,
Arlene Fox, CID
Enercon Technologies
[log in to unmask]


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