I don't know any board fabricators using DPMO to monitor board fabrication. 
There was an IPC committee tasked to make standards like IPC 7912 AND 9261.
We could not establish a way to establish the opportunity count. 
Guy

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Monday, August 24, 2015 8:38 AM
To: [log in to unmask]
Subject: [TN] PWB, PCB End Of Line Shorts/OPENS detection/Test

Fellow TechNetters:

   In today's world of High Volume Production.   What is a good YIELD Rate.
Back some 30 years I remember 89 to 92% yield depending on board complexity.
Our AOIs weren't as good and accurate as todays.   I need some kind of warm
and fuzzy number.   We used to put external image numbers on all boards to
help sort repeat images printing anomalies.   What happened to the PERFECT
COUPON that was to HELP solve these type of issues.

   I also see frequent Front to Back cores misregistration!!!!!   What's up
with that anomaly.

Victor,


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