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Date: | Fri, 1 Oct 2010 10:40:51 -0400 |
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Wee Mei -- Vias typically represent worst-case drilling and plating and
are a good indication of the overall board build quality...I would think
they were doing you a favour. In my former life as quality in a fab house
I would examine vias for my internal purposes, but forward the larger PTH
as part of the microsection puck unless otherwise specified by my
customers -- Cheers -- Ian
Lum Wee Mei <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
10/01/2010 10:35 AM
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[TN] Microsection
With regard to PCB microsection, is it a must that microsection has to be
done on plated through holes. I received a pre- and post microsection
samples from my vendor and noticed that they are done across the plated
through via. Of course, the solder cannot flow through the walls of the
vias on the post solder sample. Can I accept this post solder sample and
use it to verify the fabrication process? If yes, what are the reasons.
I am learning the trade by myself and would appreciate I can learn from
the experts in the field. If there is any articles on how to interpret the
microsection sample for PCB such how to differentiate electroless copper
from copper plating and then the tin-lead plating in the wall or pad
surface, etc would also be most appreciated.
Thanks and Regards,
~ Wee Mei ~
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