Thank you for your reply.
I am trying to develop a sensor for which i need I to V conversion for range of -1uA to 1uA with 1nA precession. My sensor pins have given me output current in the range of 1nA to 50nA. Initially i am using kiethley device to provide steady bias current to test my IC functionality.
Kindly suggest me alternatives based on these requirement.
Best Regards,
Vicky