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. 2018 Apr 2;17:38. doi: 10.1186/s12938-018-0469-5

Fig. 4.

Fig. 4

Setup for contact impedance measurement (Zcontact). a Circuit to calculate combined impedance Zsum, it is equal to the sum of both, tissue impedance (skin impedance and subcutaneous tissue) and contact impedance due to electrode 2 (Zcontact). b Circuit to calculate impedance Z23, it corresponds to sum of tissue impedance (skin impedance and subcutaneous tissue), contact impedance due to electrode 2, and contact impedance due to electrode 3