Patent ID: 7953320

Claim:
A method for determining an AC/DC cross-calibration coefficient, the method comprising: applying a first asymmetric and periodic input signal having a first asymmetry to a common input of an AC measurement element and a DC measurement element; capturing the shape of the first asymmetric and periodic input signal; determining an average value of the first asymmetric and periodic input signal; determining a first factor responsive to the asymmetry of the first asymmetric and periodic input signal; applying a second asymmetric and periodic input signal having a second asymmetry that is different from the first asymmetry to a common input of an AC measuring element and a DC measuring element; capturing the shape of the second asymmetric and periodic input signal; determining an average value of the second asymmetric and periodic input signal; determining a second factor responsive to the asymmetry of the second asymmetric and periodic input signal; and calculating an AC/DC cross-calibration as a function of the first and second average values and the first and second factors.