Amrita Pati
Ansys Employee

Hello Soikot,

The “user input” field will be enabled when you use the setsourcesignal script function to set a custom source time signal.

For more information on the setsourcesignal script function, please refer to the link below:
https://optics.ansys.com/hc/en-us/articles/360034929053-setsourcesignal-Script-command

An example script file can be found on the following page (Associated files):
https://optics.ansys.com/hc/en-us/articles/360041722614-4-level-2-electron-material-model