Why Old ATE Can't Test 140W Chargers — Three Hurdles After PD3.1 EPR
140W brick on the line but old ATE reports comm failure? Breaking down why USB PD 3.1 EPR (28V/36V/48V, 240W) breaks PD3.0 testers, and the three checks before swapping equipment.
Engineering notes on fast-charge testers — for production-line supervisors, QC managers, and equipment buyers at charger / power-adapter factories
140W brick on the line but old ATE reports comm failure? Breaking down why USB PD 3.1 EPR (28V/36V/48V, 240W) breaks PD3.0 testers, and the three checks before swapping equipment.
Machine installed but defect rate stuck at 0.5%? Three steps on protocol coverage, test accuracy vs pass tolerance, and line takt — with a self-check table.