I think that it is really important to remember that using IC testing will
measure your process capability and is a tool to verify that your process
is in control. IE that you are not adding any contaminants to your board.

I disagree that the numbers CSL or IPC 610 has come up with mean anything
though - if you tested a complete assembly and the chloride levels per cm
squared were grossly higher than a published number this doesn't really
mean that you suddenly have a problem. It means you have alot work left to
do in order to determine if there is a problem. Three months down the road
if the number is the same you can feel comfortable that your process hasn't
changed.

The biggest thing I feel about IC testing is that it is like a computer, it
will only tell you what you tell it to.
It is not a miracle test and will not solve your problems for you, apply
common sense and engineering practice with a grain of salt ; )

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