Patent ID: 8073642

Claim:
A method for measuring electrical energy in a meter comprising the steps of: storing at least one calibration factor for compensating for errors associated with at least one of at least one external current transformer (CT) and at least one external potential transformer (PT) that operates on electrical energy provided to the meter; and measuring at least one electrical parameter of the electrical energy provided to the meter comprising the step of: adjusting the measuring for compensating for the errors by processing the measured at least one electrical parameter using the at least one calibration factor; wherein calibration factors of the at least one calibration factor correct for errors measured during testing of respective test points of a series of test points, each test point corresponding to a different current magnitude for modeling non-linearity of errors associated with a range of current magnitudes for current signals of the electrical energy operated on by the at least one external CT, at least one calibration factor corresponds to each test point and the at least one calibration factor for the at least one external PT being determined from one voltage test point; and wherein the greater the non-linearity of the errors, the greater the concentration of test points.