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Originally Posted by kacir
Take a voltmeter an measure the tension between the case and the grounding wire in the wall socket. Then measure rhe currnet. You can not rely on what you "feel".
Go to the next shop selling lowest quality toys, electronics and houselold items or a nearest flea market and you should be able to buy a very, very lousy "multimeter" for 3 Euro. Then you can use it to measure your power source if it has 5.2 volts on the output.
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I don't know if you can measure the 5.2 Volts. Switched power supplies need a minimum load/current before they work. I'm not sure that the Voltmeter is enough for this power supply since it is a high resistor and the current is very low.