Use the following control panel with Angle Controlling / Open-Loop tab to measure the step response of the solar panel. 

First, put the Solar panel to horizontal position by inserting a negative duty cycle and then insert the following input signal :

Input = Duty cycle of 25% 

Output = Angle [°]

The curve can be inserted in the space below :

- either by saving the Print Screen of the control panel, in image format

- either by downloading the measurement file and saving the plot generated with Matlab, in image format