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ripple voltage measurement method?

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balagbc

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hi everone

pls tell me how to measure the ripple voltage on battery input during the charging period. my pic controller is 10bit adc . the ripple voltage may be in between 100mv to 200mv. (ie. 0.1v) i tried to measure the ripple voltage using voltage divider but the problem is i couldnt get accuracy. wht i missed in this measurement method. suggest some method or ic for accurate reading
 

Add a series capacitor to remove the DC component.
 

Whithout seeing your circuit, it becomes difficult to give a precise advice.
 

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