We have been tracking our SMT quality levels using DPMO which has been a great way to monitor our process with a huge variation in products we build (we're an low vol/high mix EMS provider).
We are now looking at implementing the same scheme for our wave solder processes and I've been thinking about how to establish our initial target for DPMO. We don't have the IPC 7912 standard and I'm not sure if there is a method to determine our starting point. I'm sure Bob Willis has some great insight on this subject but any attempt getting to his website is lighting up my anti-virus software currently. Maybe, I have the UK filter on?
Here's my question - Is there any rule of thumb that you have used/heard of that is accepted as a best in class DPMO level for wave soldering?
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