@acharnley

I'm not totally sure whether you're joking or not!
In your pdf you say "For this test mains frequency (50Hz) is too low to guarantee 500mA".
Can you explain?
I'm testing dozens of converters (e.g. e-werk, usb-werk, Luxos-U, etc.) and believe me I've no problems to get 500mA at 34Hz (i.e. 20km/h on a 28" wheel).