PTS Coupons for TH Process Control
The parametric test system (PTS) was created by Hewlett-Packard’s Printed Circuit Division in 1987 based on early H-P coupons used in production since 1972. Those early coupons focused on inner-layer shifting, by using the copper on I/Ls shorting to a PTH, moiré patterns, and hole quality cross-sections. Additional influence came from a parametric printed circuit board used as a training and process … Read More
Tags: PTS, Plate Through Hole, Soldermask, Conductors, Coupons, PADS, Parametric Test System, Etch Factors, Gerber