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Skipped Measuring Solderpads in Wave Soldering

Measuring pads have normally no mounting hole or outgassing hole in the pad. If the pad aperture dimension in the solder resist is relatively small, there is a risk that the solderwave skips that pad.  That risk increases if the solder resist layer is thicker than 35 microns and if the aperture has a relatively sharp edge.  Finally if the solderability of such a pad is not optimal, skipped joints will be very common in that case.

The attached sheet will explain the cause(s).

Jeff is the author of this solution article.

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