R&S ZVB - Page 316

R&S
®
ZVA / R&S
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ZVB / R&S
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ZVT GUI Reference
Channel Menu
Operating Manual 1145.1084.12 – 30 301
balanced state and virtually separate the differential and common mode signals. The analyzer measures
the unbalanced state but converts the results and calculates mixed mode parameters, e.g. mixed mode S-
parameters. The balanced ports of the DUT are directly connected to the analyzer ports and no physical
transformer is needed.
Measurements do not necessarily require all of the physical and logical ports of the network analyzer. To
save measurement time, it is recommended to define the ports that are actually used in the current test
setup (Define Measured Ports). Unused ports will not be considered for the calculation of mixed mode, Z-
and Y-parameters.
Option R&S ZVA-K6 provides the true differential mode. The true differential mode extends the virtual
differential mode described so far, where the analyzer generates an unbalanced stimulus signal and uses
mathematical transformations to determine the balanced results.
The tabs of the Balanced Ports and Port Groups dialog are used to:
 Select one of the predefined balanced port configurations (Predefined Configs).
 Define a logical port based on two physical ports and independent reference impedances for the
calculation of common mode and differential mode parameters (Def. Balanced Port).
 Dissolve a single logical port so that the two involved ports are again used as physical ports
(Dissolve Bal. Port).
 Switch the True Differential Mode (option R&S ZVA-K6) on or off.
 Define port groups in order to restrict the number of measured quantities and speed up the
measurement (Port Groups).
 Apply a frequency offset to the simultaneous measurement of port groups which can be used in
situations where "Crosstalk" between different DUTs (e.g. in wafer prober applications) would
otherwise prevent the simultaneous measurement.
Predefined Configs
The Predefined Configs tab of the Balanced Ports and Port Groups dialog provides the most commonly
used balanced port configurations for the analyzer.