In the last few years several European institutes have independently developed current sources, based on the idea of applying a voltage ramp to a capacitor. These current sources are already or will be used in the near future as standards for calibrating commercial picoammeters for internal use or for customers. The currents generated by these sources are typically in the range from
Final Report 2013-03-26
The comparison has been completed and results are available in the KCDB.