Good morning all,
I have two questions that relates to conformal coating practices.  We have 
 a situation internal where we conformal coat assemblies in booths 
outfitted with black lights and the coating has a fluorescent dye marker 
(Humiseal 1B31).  Most booths have four 22W black light bulbs.  Our 
inspectors use a circular magnifier outfitted with a circular black light 
bulb.  The latter has a stronger output, possibly because the black light 
bulb is much closer to the surface being inspected.  This is leading to 
inspectors finding coating "defects" which cannot be seen with the black 
light illumination in the coating booths.  So we have a running dispute 
between inspectors and operators.

1.  Is there a meter that any of you would recommend by which we can 
measure black light intensity at various distances?  I know there are a 
number of them out on the market, but many are also of the variety that 
check the UV output of high intensity devices such as UV imaging of solder 
masks. 

2.  What do your workmanship standards say regarding inspection under 
black light?  Distance, magnification, intensity?

Thanks.

Doug Pauls
Rockwell Collins

---------------------------------------------------
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
-----------------------------------------------------