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analog voltage measurement goes to zero

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Hello,I am new to lab view forum and also Labview FPGA. First I would like to describe my system: I am measuring voltages from inverteres-three voltage measurement with LEM-LV 25-400. Three analog inputs (AI+ and AI-)are connected to LEM. I run Labview demo analog measurement program and it can measure voltage but the values donot remain contant. it goes to zero and after certain time goes to right value. My voltage never goe to zero. It may drift a little bit but almost constant. If I add filter with high sampling rate I got almost constant value but miss the ripple values. I am wondering if any one can help me would be highly appreciated.

with regards,

reaz

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