Hello,
I am working on a project where I make use of LMP91000 potentiostat for cyclic voltammetry (using amperometric mode). I have interfaced the LMP91000 with a PIC microcontroller and I am able to program it to vary the voltage between WE and RE from 0.8V (24% of my Vdd=3.3V) to -0.8 V. If I shortcircuit CE and RE to test the hardware (if doubt, please refer to Test 1 in page 23 of attached document en.DM00093722.pdf), I am able to vary Vwe-re between 0.8 and -0.8V.
However, when I place the sensor instead of shortcircuiting RE and CE, Vwe-re voltage is not capable of reaching the negative limit of -0.8 V. Instead, it stops at about -0.32 V. It does not matter how many cycles I try: it works well from 0.8 to -0.32 and back to 0.8V, but it is programmed to go down to -0.8V, which is never reached.
Please let me know if you can think of any possible causes of this problem or any solutions.
Thank you very much.
