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April 2002

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Subject:
From:
Don Vischulis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 12 Apr 2002 10:48:32 -0500
Content-Type:
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Techies:

I received the following email today, and it aroused my curiosity.  What
reasons exist for specifying dc track resistance when minimum resistance is
governed by a combination of copper weight and design width, and track
length?  Is this a case of over zealous specification or is there a purpose
behind adding another test requirement to a product with extensive
specifications?

Don Vischulis

Original message:
You may be able to help me, as I would
like to know why - in addition to specifying
impedance - an increasing number of PCB designers
and PCB fabricators are also specifying DC resistance
of PCB tracks?

I have had an increasing number of clients ask
me about series resistance being specified on
PCB tracks, but no one seems to know why..

If you are able to help with some of the reasons
why, I would very much appreciate hearing from you.


Kind regards
Martyn Gaudion
www.polarinstruments.com

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