How to measure a coil

I have a spare one of this reelight dynamos on my bike and one weekend I was curious, so I opend it up to see how it works, and to my surprise there was nothing but a coil connected to a couple of led diodes, and then the magnet on the wheel passing it, no resisten or nothing, then I tried to coil up a wire, and passed a magnet across it while measuring on my multimeter, but nothing occurred, is it because ac can't be measured like that but need time to charge, and do I need a rectifier to measure the coils potential?
Any answers is appreciated
Asked Apr 02, 2015

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