EIS Spectrum Analyser
Menu: Linear Kramers-Kronig Test
Analysis / Linear KK Check.
Generates a plot of residuals between imaginary (real) part of
impedance of Voigt -RC- model and imaginary (real) part of impedance of
Linear Kramers-Kronig test realized in this program is based on
approach developed by M.E. Orazem and co-workers and further modified
by B. Boukamp in [J. Electrochem. Soc., 142 (1995) 1885].
In this approach the Kramers-Kronig transform is replaced by the fit to
the Voigt -RC- model. If the data cannot be well approximated by the
Voigt model containing reasonable number of -RC- pairs, it means that
data are not transformable. The routine uses fit of data to the
Where τk are time constants (τk = RkCk)
distributed logarithmically within the measured frequency range.
Examination of the relative residual plot between measured and
approximated spectra give information about the measured data quality.
To prevent noise averaging, the number of time constants τk is
somewhat smaller than number of data points. You can use different
number of time constants with respect to data points by selecting Time constants/Data points ratio in Linear Kramers-Kronig test form. Click Check button in Linear Kramers-Kronig test form to restart test after changing of Time constants/Data points ratio.
See also Logarithmic Kramers-Kronig test
EIS Spectrum Analyser, 2008