New Ratio Transformer Bridges for Intercomparing Standards of RLC Bridges

Franco Castelli, Marco Faifer

Abstract

Auto balance RLC bridges are the most common instruments for impedance measure-ments on low frequencies. . Both national metrology laboratories (NMLs) and secondary laboratories (SLs) maintain the scale of ac resistance, inductance and capacitance with sets of artifact standards. In NMLs, the traceability chain for the impedance scale involves a set of coaxial ac ratio bridges, the primary standard being the calculable capacitor. The illustrated new ratio transformer bridges may operate using as reference a capacitor standard covering the whole required frequency range. Experimental bridges have been used in the intercomparison of self- mutual- inductors, resistance and capacitor. The achievable intercomparison uncertainty may not exceed a few 10-7.

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IMEKO-TC4-2005-015.pdf

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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