7- 23
Operating Concepts
S-Parameters
The S-Parameter Menu
The S-parameter menu allows you to define the input ports and test set direction for S-parameter
measurements. The analyzer automatically switches the direction of the measurement according to the
selections you made in this menu. Therefore, the analyzer can measure all four S-parameters with a single
connection. The S-parameter being measured is labeled at the top left corner of the display.
The S-parameter menu of the ES model analyzer contains the following softkeys:
•
•
•
•
•
• accesses the conversion menu.
• accesses the input ports menu.
The S-parameter menu of the ET model analyzer contains the following softkeys:
•
•
•
• accesses the conversion menu.
• accesses the input ports menu.
Analog In Menu
This menu allows you to monitor voltage and frequency nodes, using the analog bus and internal counter.
For more information, refer to the "Service Menus and Error Messages" chapter in the service guide.
Conversion Menu
This menu converts the measured reflection or transmission data to the equivalent complex impedance (Z)
or admittance (Y) values. This is not the same as a two-port Y or Z parameter conversion, as only the
measured parameter is used in the equations. Two simple one-port conversions are available, depending on
the measurement configuration.
An S
11
or S
22
trace measured as reflection can be converted to equivalent parallel impedance or admittance
using the model and equations shown in
Figure 7-4.
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