Realization of Absolute Phase and AC Resistance of Current Shunts by Ratio Measurements

• This paper presents a simplified method for realizing absolute phase and ac resistance for current shunts using only impedance ratio measurements. The method is based on three geometrically identical current shunts with different resistances, but with the same inductance, capacitance, and ac-dc resistance change of resistance at ac compared to dc). We demonstrate how the inductance, capacitance, and ac resistance can be calculated from the complex impedance ratio measurements, therefore realizing absolute current shunt impedance. The method gives competitive uncertainties of around 200 μΩ/Ω for amplitude and 400 μrad for phase at 1 MHz in the 1-Ω range.

Nyckelord

Impedance

Resistance

Current measurement

Impedance measurement

Electrical resistance measurement

Capacitance

Inductance

current shunt

measurement standards

phase measurement

resistance.

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