Demand for electronic watthour meters which can carry many functions has been increasing, because power rate systems have become more complicated and automatic meter reading has been introduced in recent years. However electro watthour meters are still expensive compared to the induction type watthour meters, and are therefore not popular. A low cost electronic watthour meter is thus required. The power measurment formula using a Hall element has long been known, and it has been thought that this formula can be used to construct a low cost watthour meter. We have established a method of compensating the temperature characteristics of the Hall element which was required to achieve the practical use in an electric watthour meter, and have reached the required standard.
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