Based on the SMART Group On-Line survey on defect
monitoring, to date the use of PPM Parts Per Million Monitoring is the
most popular method which is well covered in the IPC document see www.smartgroup.org
I have asked the question before but would
engineers like to have an average PPM level each month for screen print,
component placement, reflow and wave soldering to compare with their own
production results. It would have to be based on a known technology but could be
valuable as a point of reference for benchmarking. Its a little project we are
considering over the UK and would like to know its value to other engineers. I
know there are many issues but as long as everyone know what the data is, where
it comes in terms of board type NOT COMPANY and how its calculated I think it
has a value.
Please let me know your thoughts on the
subject.