RIGOL DSA875 - Manual (Page 103)

Chapter 2 Front Panel Operation RIGOL
User’s Guide for DSA800 Series 2-51
the measurement wizard at the lower side of the interface: measurement with the
device under test disconnected (represented by trace 2) and measurement with
the device under test connected (represented by trace 1). The return loss
(represented by the math trace) is determined by the difference of the results of
the two measurements and the reflection coefficient and VSWR are determined by
the return loss.
1. Reset
Reset the VSWR measurement parameters.
2. Cal Open
Disconnect the device under test and then press this softkey. The instrument
executes the first measurerment and the measurement result is represented
by trace 2.
3. VSWR
Connect the device under test and then press this softkey. The instrument
executes the second measurement and the measurement result is
represented by trace 1. At the same time, the analyzer calculates the
difference between the two measurement results (represented by the math
trace) and calculates the return loss, reflection coefficient and VSWR on the
basis of the difference.
4. Marker
Select one of the four markers and the default is marker 1. When a marker is
selected, you can set its state. The marker selected is marked onto the math
trace and the measurement result at the current marker is displayed in the
measurement wizard. You can use the knob to move the marker to view the
measurement results of different positions.
5. Marker State
Set the state of the current marker.
6. Ref Level
Adjust the vertical position of the trace on the screen.
 Being different from Ref Level in the AMPT menu, this parameter has no
influence on the reference level of the analyzer.