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ADuCM355 - Square Wave Voltammetry

Hi ,

I'm using EVAL-ADUCM355QSPZ with different kinds of sensors and I 'd like to apply a wave from -1.6V until 0.5V but apparently my hardware is saturating.

How you can see in image bellow( green line is the line of voltage in CE0 and yellow is voltage of RE0)

Someone have idea about what can be happening?

thanks in advance