Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

Page: 185 / 813

R&S
®
ZVA/ZVB/ZVT Trace Menu
1145.1084.12 4.23 E-6
•
Balanced and Measured Ports opens the dialog of the same name to define the properties of
the test ports. Single-ended (unbalanced) impedance parameters are assigned to the physical
test ports of the analyzer. Balanced impedance 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 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.
Relation between impedances and S-parameters
The relation between the generalized (multiport and mixed mode) impedance parameters
and the S-parameters is analogous to the 2-port case. For reflection measurements:
and for transmission measurements:
where Z
0i
denotes the reference impedance of the analyzer port no. i.
Remote
control:
CALCulate<Ch>:PARameter:MEASure "<Trace_Name>", "SZ11" |
"SZ12" ...
Create new trace and select name and measurement parameter:
CALCulate<Ch>:PARameter:SDEFine "<Trace_Name>", "SZ11" |
"SZ22" | ...
Admittance
The Admittance submenu contains the functions to convert reflection S-parameters into matched-circuit
admittances.
Matched-circuit admittances and short-circuit Y-parameters
The analyzer provides two different types of admittance parameters that are essentially based on
different n-port circuit models:
•
The matched-circuit admittances describe the admittances of a DUT that is terminated at its
outputs with the reference impedance Z
0
.
•
The short-circuit Y-parameters describe the admittances of a DUT with output ports terminated