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July 1999

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Subject:
From:
Michael Meltzer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 21 Jul 1999 10:03:48 -0800
Content-Type:
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>Richard,
>
>  We normally use round lighted lenses ( 3x ) to overral inspection and
>microscope to check places that operators are not sure that were good on the
>previous inspection. Some operators claim about headache if continuos use of
>microscope is required, so we try to avoid this situation using microscope
>only to check doubts had on the first inspection.
>  Check the operator vision health before assign him this job.Some people
>didn`t realize that they can`t see very clear.
>  Regarding with AOI ( Automated Optical Inspection ) equipments I am not
>familiar with, but I don`t known how this system can handle HASL boards if
>the contrast between the solder and pad is too little. Someone has the
>answer ???
>
>Jorge Dourado de Santana
>Maintenance / Process Engr
>Microtec - Brazil
>

Jorge,
One way to avoid the headaches is to digitize the microscope images and
display them on a monitor.  We have such a setup, and it saves the eyes, if
you have to do hours of inspection.  I can get you brand names and models
of the equipment if you're interested.

Michael Meltzer
Lawrence Livermore National Lab

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