hi, i brought the ADC 11 acquisition system to measure the fuel cell i constructed myself. i knew that the converter itself have an internal resistance of 2.5Mohm. According to the the guide, v can connect the fuel cell directly(without connecting to a load) to the terminal board connected to the converter, which used to measured open circuit potential.
to ensure that the recorded data was correct, i measured the same cell with my multimeter and i turnout to get a lower voltage value.
i don't know why? hope that you can help me.