Coverage (Coverage)

Reports traces (or any other circuit features) closer than pp_coverage or touching a solder mask clearance that exposes a pad belonging to another net.

Internal ERF Name	<Area>:coverage
Measurement Shape Measurement ID	Segment Spacing; Clearance
Layers Displayed	Solder mask External copper layer
Graphic
Purpose	Lines which pass close to a pad must be fully covered by mask to avoid solder bridging between line and pad during the assembly process.
Function	Reports traces (or any other circuit features) closer than pp_coverage or touching a solder mask clearance that exposes a pad belonging to another net. Typically, each clearance has a signal intersecting it, a trace that touches exposed copper. If it does not connect to an inner pad, it is considered a violation. Unexposed copper, too close to a SM clearance with no exposed copper within, is always reported in this category.
ERF Parameters	pp_coverage
ERF Variables	cover_dist_to_cu cover_ignore_same_net cover_ignore_intersection cover_special_check v_report_proximity
Constraint	SM Feature Spacing
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 pp_coverage, the measurement is filtered. This causes coverage violations in oversized clearances to go unreported.