FreeLists / si-list / [SI-LIST] Re: Controlled impedance test requirement

[Dave Hoover <dave_hoover@xxxxxxxxx>]

IPC-2141 is on High Speed Design and Controlled
Impedance. It is also currently under review.

Any suggestions would be welcomed.

Dave Hoover (co-chair IPC-2141)

--- "Willis, Ken" <Ken.Willis@xxxxxxxxxxxxxxx> wrote:
> 
> There is an IPC spec IPC-6012 that covers this. You
> can
> get it at:
> 
> http://www.ipc.org/
> 
> Ken
> 
> -----Original Message-----
> From: mappiani@xxxxxxxxxxxx
> [mailto:mappiani@xxxxxxxxxxxx]
> Sent: Wednesday, June 27, 2001 11:03 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Controlled impedance test
> requirement
> 
> 
> 
> Can anyone point me to where I can get guidelines
> (IPC ?)for specifying
> controlled impedance testing for PCBs? My company
> uses several different
> bare board manufacturers and all of them have
> different ideas about how
> many cards , or panels, to test in order to satisfy
> our controlled
> impedance requirements.  MY current documents only
> state that we require
> documentation that testing was done. Some vendors
> place their own test
> coupons on the panels and test each panel, some use
> the test strips that I
> put on the design. Recently, a vendor wanted to test
> one or two cards, out
> of 2500, and claim that his process is good enough
> to guarantee that the
> entire run complied to our requirement. Is this a
> reasonable expectation? I
> didn't think so and asked the vendor to do more
> testing. I understand that
> testing takes time and money, but I do expect to pay
> a more for this
> testing.
> 
> I would like to add some statement or formula so
> that all the vendors are
> testing the same percentage of cards (whatever it
> should be).
> 
> Thanks ,
> 
> Mario R. Appiani
> Senior Hardware Engineer
> ATTO Technology, Inc.
> 155 Crosspoint Parkway
> Amherst, NY 14068
> Tel. 716.691.1999 Ext. 130
> Fax. 716.691.3724
> email: mappiani@xxxxxxxxxxxx
> 
>
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