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, Ottawa, the National Bureau of Standards, Gaithersburg, and the Physikalisch Technische Bundesanstalt, Braunschweig, using a time-division multipiler watt-converter developed at the Institut Mihailo Pupin, Belgrade, are described. The measurements were made at 120 volts, 5 amperes, 50 and 60 hertz, 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 parts in a million is indicated.