This part of ISO 16773 provides guidance on optimizing the collection of EIS data from high-impedance systems. High impedance in the context of intact coatings refers to systems with an impedance greater than 109 ? - cm2. This does not preclude measurements on systems with lower impedance. This part of ISO 16773 deals with - instrumental set-up: requirements and pit-falls; - data validation: checking the measurement range and the accuracy of the data; - performing an EIS measurement: specimen co