Patent ID: 6988043

Claim:
An arrangement for use in an electricity meter, the electricity meter operably coupled through an external transformer to measure electricity consumption on a power line, the arrangement operable to compensate for measurement errors, the arrangement comprising: a) a source of digital measurement signals comprising an internal sensor circuit and an analog-to-digital conversion circuit, the internal sensor circuit configured to convert power line signals received from the external transformer to measurement signals, the analog-to-digital conversion circuit configured to receive the measurement signals from the sensor circuit and convert the measurement signals to digital measurement signals; b) a memory storing data representative of at least one error rating for the external transformer; c) a processing circuit operably coupled to the source of digital measurement signals to receive digital measurement signals therefrom; the processing circuit operable to obtain at least one electricity consumption measurement value corresponding to at least a part of the digital measurement signals, adjust the at least one electricity consumption measurement value using at least a portion of the stored data, and adjust the at least one electricity consumption measurement value using an internal calibration value, the internal calibration value corresponding to at least one error associated with the internal sensor circuit.