RIGOL DSA875 - Manual (Page 65)

Chapter 2 Front Panel Operation RIGOL
User’s Guide for DSA800 Series 2-13
Figure 2-5 After Auto Scale
Ref Level
Set the maximum power or voltage can be currently displayed in the window. The
value is displayed at the upper left corner of the screen grid.
Key Points:
 The maximum reference level available is affected by the maximum mixing
level, input attenuation and preamplifier. When you adjust it, the input
attenuation is adjusted under a constant maximum mixing level in order to
fulfill the following inequality:
mix PA RF Ref
L a a L
≤ + − (2-3)
Wherein,
Ref
L
,
RF
a
,
PA
a
and
mix
L
denote the reference level, input
attenuation, preamplifier and maximum mixing level respectively.
 You can modify this parameter using the numeric keys, knob or direction keys.
For more details, please refer to “Parameter Setting”.