External transformer correction in an electricity meter

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, and
• adjust the at least one electricity consumption measurement value using at least a portion of the stored data.