The Select Sources dialog box will appear.
This shows all sources that were previously added.  
  b) Select Congure if a new source needs to be added. 
The External Source Conguration dialogue box will appear. 
  c) Select  Add to add another source.  
  d) From the Modify Source dialogue box:
  i) Type in source name.
  ii) Select source type from drop-down menu. 
  iii) Select OK.
80 | Keysight | Antenna Test – Selection Guide