In the world of PCB manufacturing, catching defects early can save you time and money. Enter the PCB Test Coupon—a small but mighty tool that acts like a quality checkpoint for your entire production run. At JHYPCB, we’ve relied on PCB Test Coupons for years to verify everything from trace widths to interlayer connections in our rigid, flexible, and rigid-flex PCBs. This guide explains what a PCB Test Coupon is, how to design one effectively, and the key tests it enables, like controlled impedance and IPC standards. Whether you’re prototyping a single-sided board or scaling up to turnkey assembly with SMT and THT, understanding PCB Test Coupons will help you build boards that perform flawlessly. Let’s dive in.