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August 1997

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Date:
Thu, 14 Aug 1997 14:19:12 -0400
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  Steve..

    I am not so sure that an electrical test of single or double sided pwb's,
  in small quantities, is cost effective. You can inspect the pwb for
  shorts/opens very effectively with visual inspection. The setup time would
  probably be much longer. However, for multilayers, since you can not see
  the internal layers, it should be a requirement! Who wants to fix a bad
  board ??
    At one time, we use to specify 500v, but now we indicate the max voltage
  that the surface will see in operation.
    You should also talk to your vendor and agree on the type of data that
  they will use to test the bare board. They are contractually obligated to
  produce a pwb that agrees with the manuf. data as supplied by YOU (film or
  Gerber files) ...they are not mind readers and SHOULD HAVE KNOWN what you
  wanted. The best data to supply, would be the released net list of the
  product from the electrical community. In this way, if the pwb designer
  made a mistake, so VERRRY unlikly, then the design could be reworked with
  less impact to cost/schedule as related to a stuffed assembly.
    I am sure that the high volume guys/gals will have their own imputs on
  this. Hope this helps. Have a good day.
                                          Regards,
                                                   Bob Vanech
Norden Systems
Norwalk, Ct.


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