Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

Page: 190 / 813

Trace Menu R&S
®
ZVA/ZVB/ZVT
1145.1084.12 4.28 E-6
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.
Remote
control:
CALCulate<Ch>:PARameter:MEASure "<Trace_Name>", "Y11" | "Y12" |
"Y21" | "Y22"
Create new trace and select name and measurement parameter:
CALCulate<Ch>:PARameter:SDEFine "<Trace_Name>", "Y11" | "Y12" |
"Y21" | "Y22"
Stability Factors
Opens a dialog to select one of the three two port stability factors K,
µ
1
or
µ
2
.
The Stability dialog provides the following settings:
•
Stability Factor selects the stability factor to be calculated; see definitions below.
•
Used Test Ports selects the test port number of the analyzer to be connected to the input (DUT
Input) and the output of the DUT (DUT Output) . The ports can be arbitrary, however, the
stability factor calculation is based on 2-port reflection and transmission S-parameters so that
the input and output port numbers must be different.
•
The Port Topology panel is analogous to the corresponding panel in the More S Parameters
dialog . Stability factors can be calculated for unbalanced ports only. If a balanced port
configuration is selected, the analyzer generates an error message.
Values of any of the stability factors less than 1 indicate potential instability.
Definition of stability factors and stability criteria
The stability factors K,
µ
1
and
µ
2
are real functions of the (complex) S-parameters, defined as follows: