Re: [SI-LIST] : Plane short

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From: Dima Smolyansky (dima@tdasystems.com)
Date: Mon Apr 30 2001 - 11:41:52 PDT


Andrew:

I would rephrase this to say: unless the board is densely populated with
active DUTs and bypass capacitors, TDR should help. At least in my
experience it did.

Thanks,

===================
Dima Smolyansky
TDA Systems, Inc.
11140 SW Barbur Blvd., Suite 100
Portland, OR 97219
(503) 246-2272
(503) 246-2282 (fax)
(503) 804-7171 (mobile)
http://www.tdasystems.com
The Interconnect Modeling Company(TM)

----- Original Message -----
From: "Ingraham, Andrew" <Andrew.Ingraham@compaq.com>
To: "'Bastola, Subas'" <subas.bastola@intel.com>
Cc: "'si-list'" <si-list@silab.eng.sun.com>
Sent: Monday, April 30, 2001 8:20 AM
Subject: RE: [SI-LIST] : Plane short

> > What is the best method to find the location of a short between the
power
> > and gnd plane in a fully assembled board? Can TDR help?
>
> In answer to the second question, I suspect that a TDR is not much help
with
> a fully assembled board. All those bypass capacitors tend to look like HF
> shorts, and if the real short is in a component, it might be nearly
> indistinguishable from a working capacitor in the nanosecond timeframe.
>
> Andy
>
>
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