Residual impedance correction in impedance analyzers when using an asymmetrical test fixture needs three reference measurements, usually open circuit, short circuit, and
load (meaning an impedance close to the impedance under test).
This paper provides an error estimate for impedance measurements that apply a simple open/short correction in spite of using
an asymmetrical test fixture. Experimental results show that the minimal error is obtained for impedance values close to the
geometric mean of the short-circuit and open-circuit impedances, and that the theoretical prediction is indeed an upper limit for the actual error.
CitationTorrents, J.M.; Pallas R. Error analysis in two-terminal impedance measurements with residual correction. IEEE Transactions on Instrumentation and Measurement. 2005, vol 54 núm 5, p. 2113-2116
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