In a tent in the Sahara desert? Or anywhere else...field conditions.
Don't know if there are air ionizers for use in such conditions? Do they
exist?
Inge 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Marsico, James
Sent: den 27 mars 2007 13:26
To: [log in to unmask]
Subject: Re: [TN] ESD charges in conformal coatings

Why not brush the boards under an air ionizer?

Jim Marsico
EDO Corporation
Amityville:  631-630-5079
Bohemia:  631-218-7057
[log in to unmask]

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: Tuesday, March 27, 2007 7:09 AM
To: [log in to unmask]
Subject: [TN] ESD charges in conformal coatings

 Hi all gnus and gurus,
 
Sometimes, we need clean boards from dust and dirt. Field practise, no
proffesional facilities. Not surprisingly, you move electrons from the
conformal coating's surface. I  have measured several kilovolts at a
distance of one inch from the board. The highly insulating acrylic
coating keeps the charges effectively for hours, quite expected too. ESD
brushes not much better. Not even grounded ESD brushes works. I get rid
of the surface charges if I dip the board in water, quite natural,
because of the large contact area and polarisation media. EE in the US,
did an investigation during 8 years. They ranged the 23 most common
electrical failures and their sources. Conformal coating charges came as
number 9.

Question: anyone who can recommend a dust and dirt removal method, when
dry brushes don't work and water is not allowed?

Inge

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