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How to use EIS accuracy contour plots

Latest updated: August 27, 2021

EIS accuracy contour plots must be used to interpret errors made during EIS measurements and identify the best frequencies possible to be used for a given impedance range. The aim of Fig. 1 is to demonstrate how to read and understand EIS accuracy contour plots provided with each potentiostat .


Fig 1: Superimposition of EIS accuracy contour plot and modulus
Bode diagram of R1+R2/C2  electrical circuit (left) and Nyquist diagram
of the same circuit (right).


The different colored areas show different ranges of impedances that can be measured at various frequencies within a specified error in magnitude (%) and in phase (°).

The accuracy contour plot is an image of the capability of the instrument and is only valid for a given set of conditions (input amplitude, temperature, data averaging, etc).


For more information see Application note #54:  How to read EIS accuracy contour plots.

Electrochemical Impedance Spectroscopy EIS contour plots frequency best practice
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