An international comparison of power meter calibrations conducted in 1987

The results of an intercomparison of power meter calibrations conducted during 1987 between the National Research Council of Canada, Ottawa, the US National Bureau of Standards, Gaithersburg, the Physikalisch-Technische Bundesanstalt, Braunschweig, and the Institut Mihailo Pupin, Belgrade, are described. The comparison was implemented by a transfer standard consisting of a time-division multiplier watt-converter developed at the Institut Mihailo Pupin. The measurements were made at 120 V, 5 A, and 50 and 60 Hz, at power factors of 1.0, 0.5 lead and lag, and 0.0 lead and lag. An agreement between the laboratories of better than 20 ppm is obtained. >