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Automated system for inductance realization traceable to AC resistance with a three-voltmeter method

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2 Author(s)
Callegaro, L. ; Ist. Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy ; D'Elia, V.

An automatic system for the comparison of unlike impedances in the range 1 Ω-10 kΩ, based on the three-voltmeter method, has been constructed and is undergoing extensive tests as a system for realization of the inductance scale at the Istituto Elettrotecnico Nazionale Galileo Ferraris (IEN), in the range 100 μH-10 H at frequencies of 120 Hz and 1 kHz. The main features of the system are a two-phase direct-digital synthesis generator for energizing the standards, complete four-terminal pair definition of the standards with automatic servosystems, the use of a single high-accuracy voltmeter and a switching unit, and optical links for the distribution of frequency references. Measurements at the metrological level have been performed at 1 kHz with inductors in the range 10 mH-1 H

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Instrumentation and Measurement, IEEE Transactions on  (Volume:50 ,  Issue: 6 )