Hi everyone,

The upper management team here uses a DPU metric for our board shop, for
what reason I am trying to comprehend.  Basically, one solder joint defect
on a board equates to the whole board counting as a defect.  The
opportunities are irrelevant - every board gets one opportunity.  When the
"PPM" numbers are published, which is what they call them, they are
outrageously high.  My questions are:
Does anyone use Defects per Unit at the board level?
If so, what kind of numbers are you seeing.?

I am pursuing a change to use real DPMO metrics, but so far I've been
unsuccessful.  I even presented IPC-7912, but it was ignored.  Thanks in
advance for the help.

Howard Watson
SMT Manufacturing Engineer
AMETEK/Dixson

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