RIGOL DSA875 - Manual (Page 71)

Chapter 2 Front Panel Operation RIGOL
User’s Guide for DSA800 Series 2-19
Start
Peak Search
Adjust Ref Level
Peak > Ref Level?
Decrease maximum
mixing level
Stop
Increase maximum
mixing level
Large signal?
Auto Scale
N
N
Y
Y
Figure 2-8 Process of Auto Range
RF Preamp
Turn on or off the preamplifier located at the front of the RF signal path. When the
signal under measurement is small, turning on the preamplifier can reduce the
displayed average noise level; therefor, you can distinguish small signals from the
noise.
Key Points:
The corresponding icon
will be highlighted in the status bar at the left side of
the screen when the preamplifier is turned on.