![]() We started with the power load set to 0 amps and then turned it up until it matched the promised amperage, ensuring the voltage stayed between 4.75 volts and 5.25 volts. This setup allowed us to finely control the power flow and determine whether it matched the advertised rate. Chargers with USB-A ports: We tested the maximum power draw from each port by plugging in a variable power load and an ammeter. ![]() We used the Total Phase USB Power Delivery Analyzer and its Data Center Software to measure and record this data, including the advertised power profiles, the steady state output, and whether any errors occurred in charging.
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