Hi support team,
I am currently working on a project witch need to measure with high precision low current. To do that i use the CN 4070, with the software CN 4070 evaluation software. The board is working good, indeed i tested it with photodiode to see the current variation. Nevertheless, it seems like i don't receive the good value of the current (by the way I also measure the current thanks to a really precise Amper sensor), it depend of the scale input range that I choose. The board use an ADA 4530 Femtoampere Input Bias Current Electrometer Amplifier with a feedback resistor, and we can choose the value of this resistor thanks to the software to determinate the full scale input range.
What I would like to know is how to calibrate the board to have to correct values, whatever the scale input range ( I can put an offset and Gain adjustment).