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2 Metrology and Measurement Systems

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RMS voltage measuring system for precise evaluation of electric quantities

100%

Pogliano U. , Trinchera B.

2007

tom Vol. 14, nr 4

555-562

This paper is about a system for the measurement of RMS voltage. One or more of these systems can be employed as components for a wide range of applications for the measurement of electrical quantities in the field of electrical metrology. The first implementation has demonstrated its functionality and the possibility to reach a stability of the AC voltage measurement in a wide frequency range with an accuracy within 10 parts in 10&sup6;, limited only by the DC voltage accuracy of the DAC employed. A second implementation, now under investigation, aims at improving the accuracy of the system for high precision measurements.

Design of a thermal wattmeter in the audio frequency range

80%

Pogliano U. , Trinchera B. , Bosco G. , Serazio D.

2008

tom Vol. 15, nr 4

563-569

This paper describes the development of a system for the measurement of power in the audio frequency range. Flexible units operating with a strategy based on the evaluation of rms quantity by a thermal method have been constructed. For each unit of the set-up, measurements and a preliminary characterization have been performed. The main quantities to be measured are two voltages, difference and sum. The difference voltage has been evaluated by means a vectorial voltmeter, instead the sum voltage by means a rms voltmeter. The module of the voltage difference in the acoustic band seems to be lower than 10 μV. Further investigation and results will be extended when all components of the measuring system will be employed together.