Rohde & Schwarz 1145.1010.04/05/06, Руководство по эксплуатации

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Trace Menu R&S
®
ZVA/ZVB/ZVT
1145.1084.12 4.16 E-6
Single-Ended and Mixed Mode Parameters
The analyzer measures single-ended (unbalanced) parameters (S-parameters, impedances,
admittances, Z-parameters, Y-parameters) unless a balanced port configuration is selected. In the More
S-Parameters dialog and the analogous dialogs for the other quantities, the left parameter selection
field shows the parameter type (S, Y, Z) and is disabled (grayed). The range of output and input port
numbers <out> and <in> depends on the analyzer model.
The analyzer switches to mixed mode parameter measurement if a balanced port configuration is
selected. The left parameter selection field is enabled and offers a selection of matrices S
<mout><min>
(or
Z
<mout><min>
, ...) where <mout> and <min> denote the output and input port modes. The following three
output or input modes are available:
•
s: Singe-ended (for unbalanced ports)
•
d: Differential mode (for balanced ports)
•
c: Common mode (for balanced ports)
All possible combinations of mixed mode parameters (e.g. Sss, Scs, Sds, Sdd,..., Zss, Zcs,...) are
provided. Sss is used for unbalanced S-parameters if the balanced-unbalanced conversion is active;
otherwise the port mode indices ss are omitted.
The selected modes must be compatible with the port configuration. If an attempt is made to select an
incompatible parameter (e.g. a single-ended parameter for a balanced port), the analyzer displays an
error message.
Ratios
The Ratios submenu selects and defines ratios of wave quantities.
•
b2/a1 Src Port 1, b1/a1 Src Port 1, b2/b1 Src Port 1 , and b1/b2 Scr Port 1 select predefined
ratios of the standard 2-port wave quantities a
1
, a
2
, b
1
, and b
2
, to be measured in forward
direction with port 1 providing the stimulus signal.
•
More Ratios opens a dialog to define and select arbitrary ratios of wave quantities for different
detectors and source ports or more than 2 ports. .
In contrast to S-parameters, ratios are not system error corrected. A power calibration can be applied to
ratios; see Data Flow in the System Overview chapter.