Sender: |
|
X-To: |
|
Date: |
Wed, 28 Mar 2007 08:52:35 -0400 |
Reply-To: |
|
Subject: |
|
From: |
|
X-cc: |
|
Content-Transfer-Encoding: |
quoted-printable |
Content-Type: |
text/plain; charset="US-ASCII" |
MIME-Version: |
1.0 |
Parts/Attachments: |
|
|
Inge,
Have you tried an Anti-Static Film Cleaner like "Film Kleen" from
Anchor? There is a Film Kleen, Film Kleen II, Diazo Film Kleen, not sure
what the difference is. Circuit Check recommends the Diazo Film Kleen
for cleaning their fixtures. I also stumbled across an Ionizer that
fits on can of compressed air.
http://www.kinetronics.com/cgi-local/SoftCart.100.exe/online-store/scsto
re/cai.html?L+scstore+zczg8040ff939793+1180305318
Jim Verrette
Electrical Engineer
-----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,
=20
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
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 To
unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET
Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the
posts: send e-mail to [log in to unmask]: SET Technet Digest Search the
archives of previous posts at: http://listserv.ipc.org/archives Please
visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=3D4.3.16 =
for
additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
|
|