I doubt it - The whole purpose of a guard trace, as I understand it, is to
provide electrical shielding to prevent crosstalk [undesired electrical
coupling]. Personally, I don't see how residue of any kind (except
metallic) could reduce the effectivity of a guard trace. If there is a
problem, it is likely a design issue. IMHO.

Denis Lefebvre, C.I.D.
Senior PCB Designer
Finisar Corporation
1308 Moffett Park Drive
Sunnyvale, CA 94089-1133
(408)542-3832
http://www.finisar.com

At 09:09 AM 12/7/2001 +0100, you wrote:
>Hi All,
>
>I am after information on Guard Traces. Is there any information / paper on
>the reliability / effectivity of a guard trace being reduced due to no-clean
>flux residue.
>
>Thanks for your help.
>
>Best regards
>
>Marc.
>
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