I have a basic question.  What is the industry standard on checking
PCA cleanliness?
Basically there are various methods (ROSE,  IC, etc..).  For a standard
SMT
production line, is the testing done once a day, week, batch, etc..  I
understand that the 
testing is to be used as a process control.  Maybe some SMT lines get
the process 
under control and don't do testing?   What should the total ion
contamination on a standard
SMT  PCA be below for a standard SMT PCA?  Thank you.
 
Best Regards,
 
Michael Forrester
Sr. Product Engineer

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