RIGOL DSA875 - Manual (Page 24)

RIGOL Chapter 1 To Install&Run the Software
1-8 User’s Guide for EMI Test System
Note: When the software is started via this method, the communication
between the software and spectrum analyzer is built automatically (make sure
that your PC has already been connected to the spectrum analyzer).
To View the Help Document
When the software is successfully installed, you can view the help document in the
following two modes.
(1) Click [Start]  [All Program]  [RIGOL]  [EMI Test System] to open
the EMI Test System_Help Document_CN or EMI Test System_Help
Document_E to view the specific functions and applications of the software.
(2) Start the software and click in the software main interface to recall the
corresponding help document.