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The Josephson-Effect-Based Primary AC Power Standard at the PTB: Progress Report

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7 Author(s)
Palafox, L. ; Phys.-Tech. Bundesanstalt, Braunschweig ; Behr, R. ; Ihlenfeld, W.G.K. ; Muller, F.
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This paper reports the incorporation of a Josephson waveform synthesizer (JWS) into the primary standard for AC electrical power at the Physikalisch-Technische Bundesanstalt (PTB). The increase to 10 V of the amplitude delivered by the JWS has allowed matching of the levels of the signals measured to determine the active, reactive, and apparent power-at the 120-V and 5-A level, which is also measured by the device under test. The inherent noise- and drift-free voltages delivered by the JWS allow calibration of the core sampling voltmeter of the PTB primary power standard with an uncertainty of 0.4 muV/V(k = 1) in 100 signal periods and as part of the measuring sequence.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:58 ,  Issue: 4 )