Fingerprint measurements to detect AAs require a high signal-to-noise ratio. Even with precise measurements, any experimentally measured signal of Ψo (or output current) may have SNR smaller than 50dB due to intrinsic fluctuations (mainly thermal fluctuations of the ions on the surface and within the electrolyte) . Noise affects the recognition of fingerprints as the fast variations perturb the recognition of singularities in the derivates of the signal. Signal processing with noise filtering can be a strategy to improve AA readings and provide access to fingerprints.