Abstract: A current measurement circuit comprising a mutual inductance transformer 3, an integration circuit 2, and a dither circuit 1 which adds a square wave to the signal from the transformer 3 before the input of the integration circuit 2 in order that the integration circuit 2 provides a signal representing the measured current perturbed by a triangular dither signal.

Abstract: A device for measurement of electrical energy having current and voltage sensors 1, 2, a multiplexing circuit 8 and an analogue to digital converter 11. A microprocessor 9 controls the multiplexing circuit in order to supply the current and voltage signals alternately to the converter 11, the microprocessor 9 calculating the electrical energy at a moment in time using two values of the voltage situated around a current sample and using three samples of the current. By these means the time delay between samples of the voltage and current can be corrected.