RIGOL DSA875 - Manual (Page 41)

Chapter 1 Quick Start RIGOL
User’s Guide for DSA800 Series 1-21
5. Direct Execution
6. Function Switch + Parameter Input
7. State Selection
Press the key to execute the corresponding function.
For example, press Peak->CF to execute a peak search
and set the center frequency of the analyzer to the
frequency of the current peak signal.
Press the corresponding menu key to switch between
functions; change the parameter directly using the
numeric keys.
For example, press CF Step to switch between Auto
and Manual; if Manual is selected, you can directly
input the desired number to change the CF Step.
Press the corresponding menu key to modify the
parameter and return to the menu one level up.
For example, press Trig Type  Free Run to select
free trigger and the analyzer is in Free Run state at
present.