During acquisition in the Framework software users will sometimes observe overloads[1] (red or orange data points). So, maybe, your instrument, dear Branimir N. Grgur , is in an undesirable(?) state[1].

1. Basic Explanation of Overloads https://www.gamry.com/support/technical-support/getting-started-with-gamry-software/basic-explanation-of-overloads/

Many thanks prof. Samaras,

I tried all possible combinations (different reference electrode, surface area of working and counter electrode) but at ~ I

Dear Branimir N. Grgur ,

maybe, it is a good timing[1], now, to switch from the P-EIS to the alternative G-EIS mode. Gamry 1010E will responds better and it will overcome such corrosion cell fast instabilities of the (WE-surface modifications and) conductivity, in the G-EIS mode.

1. In P-EIS mode corrosion studies,, with current's auto range fast (near 1Hz) oscillations and/or instabilities, for the case of high conductivity cells and fast WE-surface modifications.

Dear Prof. Samaras,

I am not confident on which mode you mean. P-EIS, potentiostatic electrochemical impedance?

With this techniques I dont have problem, onlu with cyclic polarization and Tafel from corrosion software.

Yes, I propose to switch to the G-EIS (Galvanstatic Electrochemical Impedance Spectroscopy), from the previous P-EIS (Potentiostatic Electrochemical Impedance Spectroscopy), and other Potentiostatic modes that you work (CV and Tafel).

Solved with Faraday cage and the good earth grounding.

Maybe you could say, which one factor was more important (critical): the

1) Faraday cage (?), or the

2) good earth grounding (!),

in this case ?

Dear Ioannis Samaras

Definitely Faraday cage, with proper grounding (copper tube buried in the ground) there was some improvement (some instability still existed), but with Faraday cage, I can measure currents up to 1 nA without overload.

Thanks, dear Branimir N. Grgur .

You' re very lucky by including some (sub-) 1 nA range[1] (without overload) perplexing measurements in your CVs, for low conductivity, puzzling, cells.

1. Current Ranges 9 (10 nA - 1 A) in: Specifications (Interface 1010B) https://www.gamry.com/potentiostats/interface-1010b/

Dear Ioannis Samaras ,

Even the Gamry 1010 E has nominal current ranges 9 (10 nA - 1 A) , 10 nA ranges start from 1 to 10 nA. In some corrosion experiments (cyclic polarization) with stainless steel in a regular cell in 1 M H2SO4, I now obtained with Gamry a few points even in the range of 10-100 pA.