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3.4 Measurement
3.4.1 Stimulus
Set the stimulus conditions, including the sweep range and the number of points. In Frequency, Span
and Sweep menu, there are corresponding settings parameters.
3.4.2 Meas
Select S11 or S21 as the current measurement item. This value is also displayed in the status bar on
the left side of the screen.
3.4.3 Format
Set the display type of measurement result, enter "Format" submenu, and select the corresponding
display type. This value is also displayed in the status bar on the left side of the screen.
1.
Log Mag
The trace represents the logarithmic magnitude of the measurement result, unit: dB.
2.
Phase
The trace represents the phase of the measurement result, displayed in range from -180 ° to +180 °, as
well as the expanded phase, can be displayed above +180 ° and below -180 °. Unit: degrees (°).
3.
Group Delay
The trace represents the transmission delay of the signal through the DUT. Unit: seconds (s).
4.
Smith
The Smith chart format is used to display impedances based on the reflection measurement data of the
DUT. In this format, traces are plotted at the same spots as in the polar format. The Smith chart format
allows users to select one of the following five data groups for displaying the marker response values.
�
Linear magnitude and phase (°)
�
Log magnitude and phase (°)
�
Real and imaginary parts
�
Resistance (ohm), Reactance (ohm), and inductance (H) or capacitance (F)
�
Conductance (S), susceptance (S), and capacitance (F) or inductance (H)
5.
Polar
In the polar format, traces are drawn by expressing the magnitude as a displacement from the origin
(linear) and phase in an angle counterclockwise from the positive X-axis. This data format does not
have a stimulus axis, so frequencies must be read by using the marker. The polar format allows users
to select one of the following three data groups for displaying the marker response values.
76 T3VNA User Manual
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