Several typical circuits of AC voltage and current conditioning and filter circuit were summarized according to the different situations of electric energy measurement. The circuits of signal rising standard values were given in the paper, these circuits were compared, analyzed and evaluated. An AC voltage and current signal conversion circuit was designed which could detect the 50 times harmonic component of 50Hz AC power.
The working characteristic of the Hall current sensor CSM025A was studied in the paper. The "modeling-deviation compensation" algorithm of adopting to compensate the deviation by the software way was proposed according to the deviation problem between actual working characteristic and ideal working characteristic of the output signal in current measurement. Experiments showed that the measurement result was accurate and the "modeling-deviation compensation" algorithm effect was good.