Test coupons are one of the most important tools in PCB process verification, even though they never reach the customer. Made with the same stack-up, copper layers, vias, and trace widths as the actual PCB, they allow engineers to perform destructive tests like microsection analysis without affecting production boards. Test coupons help us verify: • Copper & plating thickness • Via walls and internal drill quality • Layer bonding and stack-up accuracy • Etch-back and internal defects • Overall I
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