| 摘要 |
The invention relates to a method and system for measuring alternating-current system quantities through measurement connections producing frequency-dependent errors, in which method the analog signal of at least one measurement channel (IL1-3, I01, I02) is sampled at a selected an approximately measured frequency fm, at a multiple frequency fs, creating a base series depicting a period on each measurement channel (IL1, IL2, IL3, 101, 102), from each base series the fundamental frequency and the magnitude and/or phase-angle values of at least one harmonic frequency component.are calculated with the aid of Fourier analysis or similar, each of which is corrected with the aid of a calibrated frequency- dependent function k(fn), when the selected quantities, (e.g., TRMS) are calculated from the calibrated values. |
