R&S ZNH, User Manual, Page: 164 / 369

Vector Network Analysis
R&S
®
ZNH
157 User Manual 1334.5985.02 ─ 02
8.3 Configuring Vector Network Analysis
For valid measurement results, you need to specify the parameters to best display the
characteristics of the measurements.
8.3.1 Configuring the Horizontal Axis
The [FREQ/DIST] key defines the frequency, span and signal standard on the horizon-
tal axis of the measurements. When measurements are made in time domain , the
[FREQ/DIST] key defines the time and distance of the measurements.
For more information on the settings of frequency, span and signal standard, see "Set-
ting the displayed frequency range" on page 129, "Defining the span" on page 129 and
Chapter 7.2.2.4, "Selecting a Signal Standard for CAT Measurements (except DTF)" ,
on page 129.
For more information on the settings of time or distance, see Chapter 7.2.2.2, "Setting
the Start and Stop Distance for DTF Measurements" , on page 128.
8.3.2 Configuring the Vertical Axis
Some results may not fit in the diagram area as it is configured in the default state of
the R&S
ZNH (e.g. measurement on amplifiers).
If you are performing measurements on an amplifier, you most likely have to change
the scaling of the vertical axis in order to see the complete transmission function.
The R&S ZNH provides several ways to adjust the scaling of the vertical axis.
8.3.2.1 Changing the Reference Value
Changing the reference value works like an attenuation or gain in that it moves the
trace to another level. The R&S
ZNH adjusts the scale of the vertical axis accordingly.
For more information, see Chapter 7.2.3.1, "Setting the Reference Value" ,
on page 130.
8.3.2.2 Defining the Reference Position
Changing the reference position moves the position of the reference value up or down.
The reference position also moves the trace up or down. The levels and the reference
value, however, remain the same. The default reference position is the grid line at the
top of the diagram. The reference position is indicated by a triangle at the vertical axis
.
The reference position is a number between 0 and 10 with 0 being the grid line at the
bottom and 10 being the grid line at the top of the diagram.
Configuring Vector Network Analysis