Fast and accurate measurement of the instantaneous average active power (IAAP) is useful for building Energy Management System (EMS) in order to assure quality of service such as continuity, optimize energy consumption and reduce carbon dioxide emission. In this paper the problems connected to the measurement of the instantaneous average active power for energy usage improving are discussed, also as the operational processes which deal to solve such problems.

The paper is focused on the performance analysis of an induction energy meter under different voltage and current waveforms, both sinusoidal and deformed, which resemble possible conditions of supply network encountered during normal operation. The measurement test bench and the experimental plan are presented. Experimental results are compared to a reference watthour meter, and the relative error is characterized in terms of dependence on input quantities.

A digital measurement method for lowinvasive clinical diagnosis of metallic prosthesis osseointegration was proposed. Electrical impedance spectroscopy is exploited to characterize the quality of the interface bone-prosthesis tissue. In this paper, in vitro and in vivo experimental results of the application of the proposed method to the evaluation of osseointegration of metallic implants used for percutaneous fixation are shown with a specific clinical case study in audiology. In particular, a cochlear implant BAHA ® from Cochlear TM with direct bone conduction was used. In vivo measurements were performed on children with fixtures implanted respectively 7, 9, and 18 months before the test.

It is necessary to maintain conditions of zero net currents in the cables of ac coaxial bridges. Current equalizers are used for dealing with this problem. It is shown here how they were applied in the construction of a two terminal-pair capacitance bridge with an uncertainty of about one part in 10⁸.

Power quality analyzers utilized in the measurements have to be calibrated and a system for both developing proper methodologies and for their calibration is now under development at I.N.RI.M. The system can supply two synchronized voltage and current signals, with the possibility of generating both calibrated periodic distorted waveforms and suitable preprogrammed aperiodic events.