PTH Annular Ring (Drill)

Reports the shortest distance between drill and laminate for PTHs (or vias) embedded in copper if closer than pp_d2c.

Analysis Category	<Area>:ar
Measurement Shape Measurement Value Measurement ID	Spacing segment Ring PTH (or via); Feature (or r0)*
Layers Displayed	Signal layer Drill layer which pierces it
Graphic
Purpose	When an annular ring around a plated through hole is too small, the hole may shift during drilling and cause insufficient plating later.
Function	Reports the shortest distance between drill and laminate for PTHs (or vias) embedded in copper if closer than pp_d2c. The measurement takes into account both negative and positive data. Measurements are segments representing the shortest distance from drill to laminate. Breakouts are enabled by specifying a breakout angle. For further details see Annular Ring Measurement.). Where PTH AR is composed of more than one feature (as in drawn surfaces), the measurement entity will be r0.
ERF Parameters	pp_layer pp_d2c
ERF Variables	pth_breakout_angle classify_pad_ar = no
Limitations