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How do I determine the output of an unmarked AC adapter?

blokeman asked
Last Modified: 2012-06-27
I have an AC adapter that is missing the usual sticker which would mention the AC or DC volts plus amps that it outputs.

I have used a multimeter to measure the volts and I get :
Multimeter set to DC = 16.96v
Multimeter set to AC = 7.86v

What is the best way to determine whether the output is AC or DC and at what current (amps)?
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