Measurement Equipment for On-Site Calibration of Energy Meters

Calibration of electrical energy meters is coming up as a metrological concern. Latest EU directives, about measuring instruments adopted for commercial transactions, state that their accuracy has to be verified in actual operating conditions. This requirement is leading all laboratories involved in energy meters calibration in serious difficulty because this kind of metrological verification is, at the moment, still not fully developed or even clarified in all involved aspects. In this paper a proper measurement equipment able to perform on-site calibration is presented and its compensation method for improving spectral purity of test signals is discussed. Finally, experimental results relating its performance evaluation show that it is suitable for the on-site calibration of energy meters.