BOB HAYNES wrote:

> Ladies and Gentlemen,
>
> I have been asked by our Purchased Material Inspection (PMI)
> department to find out how other people are doing the required
> microsection on small holes. The "B" Coupon as required by Para..7.3.5
>
> of IPC-D-275, has holes of the smallest diameter on the printed
> wiring board. These are  vias which are now 10 mils and below and it
> is reported that these are very difficult to do a good microsection
> on.
>
> Has anyone else experienced the same problem and if so what was
> your solution? Any feed back and suggestions would be greatly
> appreciated.
>
> Thanks in advance,
>
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   Dear Technetters!
I am also looking for a reliable method to cross section small holes.
Until now I didn't use automatic equipment due to the fact that I
usually
don't trust test coupons, and I check holes on the real circuit after
reflow
and wave soldering on random locations,checking also the plugging or
tenting.
Am I wrong?
Gaby

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