How can I prevent a distorted slew rate in dynamic mode?
To reach the best possible current slew rate in dynamic mode the following conditions have to be fulfilled:
- The dynamic input resistance of the voltage supply has to be very low. The electronic load is not able to compensate voltage variations at the moment of the fastest possible current variation.
- The resistance of the input lines must be very low (same reason as in a) )
- The input lines must be non-inductive. Inductive lines (all cables have got an inductive component) in addition with its ohmic resistance result in a limitation of the maximum possible current slew rate. The electronic load can not perform a fast current slew rate if the slew rate is limited by the connecting lines. Furthermore, the connecting lines behave like an energy store (self-induction) and deliver current into load and UUT when being unloaded.

