Some kind of weird pattern plating process defect?
Light makes all defects of this type LOOK huge. IF the plating where the
defects are is thinner than your specification for surface plating thickness,
then it's rejectable. Measuring is easiest with a high resolution (>200X)
optical microscope with a calibrated focus height readout. If used by a
skilled operator, you can get a resolution of 3 microns or even a little
better. If that's not good enough, you need to section and probably use SEM.
Wayne
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, July 15, 2015 10:16 AM
To: [log in to unmask]
Subject: Re: [TN] MYSTRY DEFECT
Hi Ong Seet Leng,
I got your photos and have them posted now, the links are here:
http://stevezeva.homestead.com/Mystery_Defect_1.jpg
http://stevezeva.homestead.com/Mystery_Defect_2.jpg
Looks like there was some sort of problem with the etch resist, can't say
exactly what that was though. I definitely would be kicking these back to the
vendor!
Steve
On Tue, Jul 14, 2015 at 2:15 AM, Ong Seet Leng <[log in to unmask]> wrote:
> Afternoon,
>
> I had checked a bare printed wiring board and attached a photograph on
> one of the defect found. I would like to seek advice from you gurus'
> out there on what to call this defect? For the life of me, I can't
> find the definition of it. Appreciate if someone can guide me. Thanks in
> advance.
>
> Regards,
> Ong Seet Leng
>
>
>
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