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Qualification and Reliability of Microvias
Electronics Forum | Wed Sep 05 11:59:13 EDT 2001 | mparker
thanx mucho
Electronics Forum | Tue Sep 04 14:13:56 EDT 2001 | mparker
Brian - do you have any more info regarding the in-process DPMO? Is there a working standard number to reference? What commitee is working on this?
Electronics Forum | Wed Sep 12 20:50:26 EDT 2001 | davef
Look at "DPMO: A Tool For Achieving World-Class Process Quality" Charles-Henri Mangin, SMT magazine, 8/00, p 77-78
Electronics Forum | Mon Aug 27 19:24:00 EDT 2001 | sharafali
It has been mentioned that DPMO offers large advantages over First Pass yield calculations for measuring process performance!!regarding the same I have a few queries: What are the benchmarks for using DPMO as measures of process performance? How is
Electronics Forum | Tue Aug 28 12:05:42 EDT 2001 | mparker
The advantage of DPMO is that the numbers used are PPM, (Part Per Million), rather than percentage. Percentage can distort, depending on volume. For instance, 100 units processed, 25 defects found = 75 percent yield. 4 units processed, 1 defect found
Electronics Forum | Tue Sep 04 13:41:52 EDT 2001 | Brian W.
IPC7912 deals with the end result, ie an OEM getting boards from a contract manufacturer. I have a friend who is sitting on these committees. He tells me there is a new standard due out for actually doing in-process DPMO. From a process standpoint
Electronics Forum | Wed Sep 05 08:22:48 EDT 2001 | davef
Jack Crawford, IPC Director of Assembly Standards and Technology says "IPC-7912 is used for end-item DPMO calculation; one gathering of DPMO data at the end of the entire assembly process. IPC-9261 will be used throughout the manufacturing process so
Electronics Forum | Tue Aug 28 12:25:26 EDT 2001 | Steve
To be honest with you, it doesn't really matter how you present the data, as long as you understand what the problems are. Bottom line is who cares what the numbers are unless you are doing something about it. Are you able to track the individual de
Electronics Forum | Tue Aug 28 13:46:46 EDT 2001 | mparker
To clarify on "Opportunities"- With 1000 components, the opportunities are far greater than 1000. You have 1 opportunity per component for a component defect i.e. bent lead, damaged part, tested bad, etc. You have a second opportunity per component
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