I have heard horror stories about poor quality USB power adapter. I have a collection of no less than 20 USB power adapters, most are from cell phone manufacturers and some from small projects.
I want to make use of the USB power adapters or give them away to those who needs it. I wonder if there is a way to determine the quality of USB power adapter using a multi-meter (I have a Fluke 87V clone, which can measure frequency and duty cycle)? I also have various USB cables that I can sacrifice.
What I am looking for is if the power adapter can do a proper job of converting AC to 5V DC, a clean voltage without spikes of noise, can supply the current amperage as stated on the adapter. I don't have access to an oscilloscope.