Ladies and Gents:

Perhaps you can shed some light on an issue I am sure many of you have faced in the prototyping arena. This issue has to do with the expectations one should have wrto to "catching" defects (missing, out or rotation, solder joint problems, etc) for ultra low volume (10 or less finished assemblies) or prototype PCB assemblies.

We have internalized that only 80 % (on a good day) of the board is actually inspected  by even the best of QC inspectors. That  leaves 20% of the board uninspected and one should come to expect, in the absence of paying/having time  for in-circuit or functional testing, defects to occur. This is just one of the downsides for building low  volume (usually fast turn) PCB assemblies. Do you agree?

 Does anyone know of any round-robin testing in our industry that has helped quantify or document the effectiveness of manual inspection? Has a specific testing task force ever investigated this issue? Is there a general industry need for such?

Regards

Bob Wettermann


Bob Wettermann
PH 847-767-5745

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