Hans, saw your comment about Kester analysis C.  FYI, I'm starting to use a novel SPC technique with our solder analysis - Q-charts.  It's said to work with short data runs, i. e., if you do an analysis once a week or month.  The technique is described in SPC Methods for Quality Improvement by Charles Quesenberry, published by Wiley in 97.  Don't know if that will help your immediate problem, but may be of assistance in the future.  Lou Hart   QA Mgr Compunetix. 

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