I am trying to write a code to measure current across large time scale (from us up to 1k sec) while the current value is expected to drop from uA down to pA within this time frame. The idea is to use one channel to output the voltage waveform over the whole time range then use a second channel of WGFMU in FASTIV mode to measure short-term current and then switch to SMU mode for long-term measurement. Has anyone done this type of measruement before? I wonder how to convert this measurement idea into program code.