ACS712 Current Sensor Not Working

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hello everyone, have acs712 current sensor trying measure current of 220v ac. keeps giving same value though on load. have both tried multimeter , ardunio.

what doing wrong?


edit: according 'jremington''s answer, because sine wave , multimeter show average zero. want update question;

how can measure 220v ac acs712 +-5a , arduino? possible?

how current flowing though it?
if no current flowing output halt of power supply, if power 5v no current flowing vout 2.5v.
if see datasheet there graphic(output voltage versus sensed current)  there shows that.
it's located @ page 8.
http://www.google.pt/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&ved=0cdsqfjae&url=http%3a%2f%2fwww.allegromicro.com%2f~%2fmedia%2ffiles%2fdatasheets%2facs712-datasheet.ashx&ei=aqkfu9m2iewg0qwl6yc4bg&usg=afqjcnesuweweong-vn4axduajxagxnkjg&bvm=bv.67720277,d.zgu&cad=rja




Arduino Forum > Using Arduino > Sensors > ACS712 Current Sensor Not Working


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