A method, comprising: - generating a first voltage signal ( sin(2πf in kT)) and a second voltage signal ( cos(2πf in kT)), the second voltage signal in quadrature to the first voltage signal, - injecting one ( sin(2πf in kT)) of the first voltage signal or the second voltage signal into a signal propagation path towards an electrical load, - sensing a current signal ( i k) flowing through the electrical load as a result of said one ( sin(2πf in kT)) of the first voltage signal or the second voltage signal injected into the signal propagation path towards the electrical load, - processing said first voltage signal ( sin(2πf in kT)), said second voltage signal ( cos(2πf in kT)) and said current signal ( i k) sensed, wherein said processing comprises: - calculating a linear combination of said first voltage signal ( sin(2πf in kT)) and said second voltage signal ( cos(2πf in kT)) via a first ( a) and a second ( b) linear combination coefficient, - executing an approximation procedure of said current signal ( i k) sensed via said linear combination, the approximation procedure comprising updating ( a', a"; b', b") said first ( a) and second ( b) linear combination coefficients until a target approximation is reached, wherein the updated values of said first ( a) and second ( b) linear combination coefficients at said target approximation reached are indicative of an admittance of said electrical load, and - calculating said admittance of the electrical load as a function the updated values of said first ( a) and second ( b) linear combination coefficients at said target approximation reached. - generating a first voltage signal ( sin(2πf in kT)) and a second voltage signal ( cos(2πf in kT)), the second voltage signal in quadrature to the first voltage signal, - injecting one ( sin(2πf in kT)) of the first voltage signal or the second voltage signal into a signal propagation path towards an electrical load, - sensing a current signal ( i k) flowing through the electrical load as a result of said one ( sin(2πf in kT)) of the first voltage signal or the second voltage signal injected into the signal propagation path towards the electrical load, - processing said first voltage signal ( sin(2πf in kT)), said second voltage signal ( cos(2πf in kT)) and said current signal ( i k) sensed, wherein said processing comprises: - calculating a linear combination of said first voltage signal ( sin(2πf in kT)) and said second voltage signal ( cos(2πf in kT)) via a first ( a) and a second ( b) linear combination coefficient, - executing an approximation procedure of said current signal ( i k) sensed via said linear combination, the approximation procedure comprising updating ( a', a"; b', b") said first ( a) and second ( b) linear combination coefficients until a target approximation is reached, wherein the updated values of said first ( a) and second ( b) linear combination coefficients at said target approximation reached are indicative of an admittance of said electrical load, and - calculating said admittance of the electrical load as a function the updated values of said first ( a) and second ( b) linear combination coefficients at said target approximation reached. - calculating a linear combination of said first voltage signal ( sin(2πf in kT)) and said second voltage signal ( cos(2πf in kT)) via a first ( a) and a second ( b) linear combination coefficient, - executing an approximation procedure of said current signal ( i k) sensed via said linear combination, the approximation procedure comprising updating ( a', a"; b', b") said first ( a) and second ( b) linear combination coefficients until a target approximation is reached, wherein the updated values of said first ( a) and second ( b) linear combination coefficients at said target approximation reached are indicative of an admittance of said electrical load, and - calculating said admittance of the electrical load as a function the updated values of said first ( a) and second ( b) linear combination coefficients at said target approximation reached.