Patent ID: 11860198
Assignee: SENTEC LTD
Field: Measurement (Instruments)
Classification: CPC G | IPC G  H

Claim 16:
17. A method comprising:
receiving a signal from a mutual inductance current sensor having a first transfer function;
filtering the received signal in the analogue domain using a low-pass filter having a second transfer function configured to attenuate one or more harmonic components from the signal;
converting the filtered current signal to the digital domain to generate a digitised signal;
processing the digitised current signal using a digital processing chain configured to compensate for the frequency and phase responses of the first transfer function and the second transfer function;
wherein the signal corresponds to an alternating current having a fundamental frequency and wherein the method is intended to measure up to a predetermined harmonic of the fundamental frequency;
wherein the second transfer function of the low-pass filter has a −3 dB corner frequency which lies between the fundamental frequency and the predetermined harmonic.