RIGOL DSA875 - Manual (Page 104)

RIGOL Chapter 2 Front Panel Operation
User’s Guide for DSA800 Series 2-52
 You can use the numeric keys, knob or direction keys to modify this
parameter.
Table 2-27 VSWR Ref Level
Parameter Explanation
Default 0 dB
Range -200 dB to 200 dB
Unit dB
Knob Step 1 dB
Direction Key Step 10 dB