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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