NON-LINEARITY CALIBRATION USING AN INTERNAL SOURCE IN AN INTELLIGENT ELECTRONIC DEVICE

摘要

An intelligent electrical power meter with an internal calibration system for calibrating its analog - to - digital converter is disclosed. The analog- to-digital converter is coupled with at least one sensor which is operable to sense electrical energy in one or more conductors and output a corresponding electrical signal indicative thereof, the analog - to - digital converter being operative to convert the electrical signal output by the sensor to at least one corresponding digital signal. Internal integral non-linearity calibration using a relatively low cost, low accuracy internal signal source is used, obviating the need for costly external signal sources or measurement systems.