R&S ZVB - Page 126

R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT GUI Reference
Trace Menu
Operating Manual 1145.1084.12 – 30 111
The predefined wave quantities are all obtained with the same test set configuration, port 1 providing the
stimulus signal (source port 1, forward measurement if the stimulus signal is fed to the input of the DUT).
 b2/a1 Src Port 1 is the ratio of the wave quantities b
2
and a
1
and corresponds to the S-parameter
S
21
(forward transmission coefficient).
 b1/a1 Src Port 1 is the ratio of the wave quantities b
1
and a
1
, measured at PORT 1, and
corresponds to the S-parameter S
11
(input reflection coefficient).
 b2/b1 Src Port 1 is the ratio of the transmitted to the reflected wave quantities in a forward
measurement.
 b1/b2 Src Port 1 is the inverse of b2/a1 Src Port 1.
The analyzer can also measure arbitrary ratios for other source ports; see More Ratios.
Remote control:
CALCulate<Ch>:PARameter:MEASure "<Trace_Name>", "B2/A1" | ...
Create new trace and select name and measurement parameter:
CALCulate<Ch>:PARameter:SDEFine "<Trace_Name>", "B2/A1" | ...
More Ratios
Opens a dialog to select arbitrary ratios of wave quantities, e.g. for different source ports or higher port
numbers. In true differential mode, the dialog also offers ratios of balanced wave quantities.
The notation for ratios and the functionality of the More Ratios dialog is analogous to the definition of S-
parameters.
 Numerator selects the type (left pull-down list) and the port number assignment (right pull-down
list) of the wave that forms the numerator of the ratio. Ratios of balanced wave quantities are only
available if the True Differential Mode is active; see background information below. The input
(stimulus) or output (response) port number is selected in the right pull-down list. The range of
output and input port numbers depends on the analyzer model.
 Denominator selects the type (left pull-down list) and the port number assignment (right pull-down
list) of the wave that forms the denominator of the ratio. The same waves as for the Numerator
are available.