Purpose

Lines which pass close to a pad must be fully covered by mask in order to avoid solder bridging between the line and the pad during the assembly process.

 

Function

Reports traces (or any other circuit features) that are too close to or touch a solder mask clearance that exposes a pad belonging to another copper net.

Measurements included if the distance between the circuit and the clearance is less than the pp_coverage action parameter.

Typically, each clearance has a trace that intersects it. The trace that touches exposed copper; if it does not connect to an inner pad it is considered a violation. In cases where the trace connects the first time legally and also connects a second time in a manner that causes a coverage violation, this is detected by setting the ERF variable cover_special_check = 1. This, check, however, requires a considerable amount of processing time
[default = 0 (No)].

Activation

 

Known Limitations

To avoid false alarms near SMD picture frame openings and drawn areas, a filter is applied. If the distance to the other net exposed copper is greater than 1.5 times the pp_coverage action parameter, the measurement is filtered. This causes coverage violations in oversized clearances to go unreported.