The voltage across and current through the RC model object tested using pulse excitation in impedance spectroscopy measurement method

The raw data (voltage across and current through RC model object ) obtained using pulse excitation EIS impedance spectroscopy measurement method. The data was acquired using 12-bit ADC (LTC1420) with sampling frequency changed in time segments. The 1V voltage pulse excitation duration was set to 0.1s and the total acqusition time was set to 1000s. For calculation of impedance spectrum the DSP methods were used, one of them was classical DFT method based on definiton. The object under test was built using reference RC components connected as Baunier model of anticorrosion coating with the following components (Cc = 314.6 pF, Rp = 9.935 GΩ, Cdl = 2.22 nF, and Rct = 4.969 GΩ ) with reference resistor equal to Rr= 1 GΩ. The details were described in the referenced paper.