problem of measurement with the ad7714


My ad7714 gives me some trouble.

I want to measure the current of a rheostat through a shunt resistor.

It works if the current doesn't change. However if the current changes the measures made by the converter are false.

This screenshot show a measure of the current. We can see that there is an increase of the current while the real current decrease.

Can you help me?


PS : Sorry for my mistake, I'm french.

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