A quick cross section should help explain / answer your question

Looks like something other than water penetration

afri

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Monday, December 04, 2006 11:27 AM
To: [log in to unmask]
Subject: [TN] water water everywhere!

The following files show the two sides of a PCB in a professional
weather station. This shows four dark areas which the manufacturer has
ascribed to water penetration. These are centred on a hole. The whole
thing seems funny to me, as it has happened on only a few of the holes.
I understand that it was housed in a water-tight case, not very far from
the Pacific coast. I was not able to ascertain the laminate type, but it
would not surpise me if it were paper based (FR3?).

Has anyone seen anything like this?

Brian

http://www.realweatherstation.com/FILES/DSCN9441.JPG
http://www.realweatherstation.com/FILES/DSCN9440.JPG

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