Bob Willis "How to Do It" video clip explains how to with wetting test coupons added to your PCB design. This test procedure is used on many of the NPL projects available from the NPL Defect Database It's simple and cost effective to compare process, solder finish, air or nitrogen and other process variables. The author has used this technique for many years during the implementation of lead free and has also used it alongside the wetting balance which is the industry standard method of test. www.bobwillisonline.com
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