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Why Do Customers Request Coupons? What Are They Really Measuring? The Quality Logic Every Engineer Should Understand

Customers don’t ask for coupons because they distrust factories—they trust data more than promises. This article explains what impedance, Δ-Loss, D-Coupons and CAF tests really measure about PCB processes, reliability and long-term quality.

2025-12-15

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Delta Coupon Explained: From Impedance to Δ-Loss in High-Speed PCBs

Delta Coupons shift the focus from impedance alone to insertion-loss consistency. Learn how Δ-Loss testing per IPC-TM-650 links materials, copper roughness and lamination to real signal-integrity performance in high-speed PCB channels.

2025-12-15

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