..dont get the inversion potential

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Wanderermann
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..dont get the inversion potential

Hi

I apply nicotine by pressure directly in the neuron and there is some good excitatory response; I try to see the inversion potential for this current so I changed the membrane potential from -70mV to +70mV step by step (-70, -50, -30, 0, +30, +70) and at -70mV there is not response anymore, and keep so for +30 anf +70. Most of this current is suppose to by for Na+. The question is why this current dont become inverted in +70?

Thanks.