Sadly I don't have any multimeter at work... =( (It's kind of an original project)
I'll try to get one and to experiment it more rigorously, thanks for the idea, I wouldn't have thought about it myself! 
Sadly I don't have any multimeter at work... =( (It's kind of an original project)
I'll try to get one and to experiment it more rigorously, thanks for the idea, I wouldn't have thought about it myself!