I'm currently working on measuring the current through a sensor using the Amperometric Measurement Example. The example and setup works fine for measuring current values of microamps, however, we will be expecting current values between -2-10nA. We therefore need to increase the resolution from 4.88nA, and we have unsuccessfully been trying to do this by increasing the RTIA value.
It looks like the holder of the RTIA value is overriding as the resolution of the current repeats itself with multiples of RTIA of 7500 ( see attached graph).
Any thoughts on the subject would be greatly appreciated, as the project is due soon so we really need to get this sorted.