R&S ZVB - Page 302

R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT GUI Reference
Channel Menu
Operating Manual 1145.1084.12 – 30 287
can either be a source and receive port or a pure receive port (RF Off in the Source section).
Measurements do not necessarily require all of the physical or logical ports of the network analyzer. To
save measurement time, it is recommended to restrict the measurement to the ports that are actually
needed. To understand why, note that for certain measurement parameters the analyzer will actually
perform a measurement at each of the measured ports. For example, the calculation of Z11 requires the
knowledge of the whole scattering matrix of the device under test. So if a Z11 trace is active and all Meas
flags are set, then the analyzer performs a measurement of all ports. If only port 1's Meas flag is set, then
only a measurement of port 1 is performed. Similar logic applies to the calculation of other Z- and Y-
parameters.
After an n-port (automatic or manual) system error correction, only the Meas flags of calibrated ports are
set. Loading a set of calibration data also automatically adjusts the selection of measured ports.
It is possible though to re-enable uncalibrated ports manually in order to obtain additional (uncalibrated)
measurement results. For example, adding a trace for Sij automatically sets the Meas flags for ports i and
j.
If one or more port groups to be measured are defined in the Port Groups tab of the Balanced Ports and
Port Groups dialog, then the column header changes from Meas. to Group and the column shows the
group names (capital letters).
The settings are grouped together in four sections:
 Logical Port shows the properties of the balanced ports after they have been defined in the
Balanced Port and Port Groups dialog. This section is hidden if no balanced ports are defined.
 Physical Port shows and/or defines the properties of the physical (unbalanced) ports of the
analyzer.
 Source shows and/or defines the generator settings at each physical port of the analyzer.
 Receiver shows and/or defines the receiver settings at each physical port of the analyzer.
Below the table, three buttons open additional dialogs:
 Displayed Columns... customizes the port configuration table by displaying or hiding columns.
 Balanced Ports and Port Groups... selects a balanced port configuration and defines the reference
impedances at the ports.
 Stimulus modifies all sweep frequencies and power levels in the active channel, based on an
arbitrary frequency and power reference.
The dialog contains the following additional controls:
 If Same Connector Type at All Ports is active, the connector types at all ports (but not necessarily
their gender) are always adjusted to the current selection in the Connector column.
 If Same Gender at All Ports is active, the connector genders at all ports (but not necessarily their
types) are always adjusted to the current selection in the Connector column.
 Measure Source Port Waves at qualifies whether the waves at each source port are measured at
the selected receiver or source frequency. The setting affects both the reference receiver (waves
a
n
) and the measurement receiver (waves b
n
) while port n is used as a source port. Adjust the
setting to the test setup and the measured quantity.
 Freq Conv Off disables all power and frequency-converting modes, i.e. it resets all port
frequencies to the basic channel frequency and the power to the base power of the channel,
resets Measure Source Port Waves at to Receiver Freqency and disables frequency-converting
measurements such as the Harmonics and the Mixer measurements (with option R&S ZVA-K4).
S-parameter measurements for port configurations with different frequencies are not fully supported; see
S-Parameters in Frequency-Converting Modes.