Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

Page: 188 / 813

Trace Menu R&S
®
ZVA/ZVB/ZVT
1145.1084.12 4.26 E-6
Z-Parameters...
Opens the Z-Parameter dialog to select arbitrary open-circuit Z-parameters for different ports or mixed
mode measurements. In analogy to the matched-circuit impedances, the open-circuit Z-parameters are
available for any combination of input and output ports.
Open-circuit Z-parameters can be used as an alternative to S-parameters (or short-circuit Y-
parameters) in order to completely characterize a linear n-port network.
Z-Parameter
Is a dialog to select open-circuit Z-parameters for multiport measurements (including the 2-port Z-
parameters) or mixed mode Z-parameters.
The notation for Z-parameters and the functionality of the Z-Parameter dialog is analogous to the
definition of S-parameters. The dialog provides the following settings:
•
Z-Parameter selects the type (left pull-down list) and the port number assignment (right pull-
down list) of the Z-parameter. Mixed mode parameters are only available if a balanced port
configuration is active. They are expressed as Z
<mout><min>
, where <mout> and <min> denote the
output and input port modes. The port numbers are assigned in the order Z
<out>< in>
, where
<out> and <in> denote the output (response) and input (stimulus) port numbers of the DUT.
•
Balanced and Measured Ports opens the dialog of the same name to define the properties of
the test ports. Single-ended (unbalanced) Z-parameters are assigned to the physical test ports
of the analyzer. Balanced Z-parameters are assigned to logical test ports. Selecting a balanced
port configuration with logical test ports means that the balance-unbalance conversion is
switched on and that the analyzer provides mixed mode Z-parameters.
•
The graphics above the Balanced and Measured Ports button illustrates the current port
configuration.
The port configuration is valid for all traces in the channel
The settings made in the Balanced and Measured Ports dialog are channel settings and therefore apply
to all traces assigned to the channel (Balanced and Measured Ports is also accessible through Channel
– Mode – Port Config... ). Within a channel the analyzer measures either single-ended or mixed mode
parameters. If a balanced test port configuration is selected the single-ended parameters assigned to
the channel are converted into mixed mode parameters.