METHOD AND APPARATUS FOR DETERMINING ELECTRICAL IMPEDANCE

摘要

A method of determining electrical impedance in an electro chemical cell (2) is disclosed. The electro chemical cell (2) is connected in series with a first limb (4) of a current mirror circuit (3) and a reference impedance (6) is connected in series with a second limb (7) of the current lower circuit (3) such that the current in the first limb (4) is substantially proportional to the current of the second limb (7). A potential difference is determined in the object (2) and the potential difference across the reference impedance (6) is measured.