Coating thickness measurement is an important step in PCBA quality control. Different conformal coatings are applied during PCBA manufacturing, depending on specification requirements. 

  The coatings range from a simple water soluble dust protection (typically < 20μm)  to specialized hydrophobic coatings (<1 μm).

It is common to use test coupons to verify the thickness of the coating. The problem is that there is, typically, significant difference between the coating thickness on coupon and actual product. MProbeVis MSP enables measurement of the coating thickness directly on electronic components.   The measurement can be done on different areas of the PCBA, including on SMT elements surface to verify uniformity and thickness of the coating.  Measuring coating thickness directly on PCBA makes a big difference in yield of the final product. The measurement is, typically, done using 40 μm or 20 μm measurement spot in the Visible/Vis-NIR range (400-1000 nm).