Bogdan Gaby wrote:-
>How do you ensure the integrity of the plating in small vias?
>We require the manufacturer's cross sections as a proof of test
>for our circuits.Very seldom,they contain small vias.
>But,anyway,the failures found recently in our line are in random places
>on the boards.
>Are there other tests on bare boards which can detect reliability
>problems ?

Bare board electrical test, if carried out properly, should detect any
opens in via holes. If the board is double sided with surface mount both
sides, testing must be simultaneous and not single sided flip test.

However, this will only detect complete voids and partial voids will
still get through. There is no substitute for good quality manufacture.

Good luck,
Paul Gould
Teknacron Circuits Ltd
[log in to unmask]
Isle of Wight,UK

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