R&S ZVB - Page 322

R&S
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ZVA / R&S
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ZVB / R&S
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ZVT GUI Reference
Channel Menu
Operating Manual 1145.1084.12 – 30 307
when the first port group is deleted) the deleted one. If exactly two port groups exist, pressing the
Delete Group button will delete both groups.
Only ports whose Meas flags are set in the Port Configuration table can be assigned to a port group. After
enabling Simultaneous measurement of Port Groups the Meas flags can no longer be modified.
Simultaneous Measurement of Port Groups is not available in any one of the following situations:
 Less than two port groups are defined
 Frequency Converter mode is active
 True Differential Mode or Defined Coherence Mode is active
 In a frequency converting measurement where Measure Source Port Waves at: Source
Frequency is chosen in the Port Configuration.
Simultaneous Measurement of Port Groups
A port group is a continuous range of measured ports which is labeled with a capital letter. The analyzer
can measure several port groups in parallel. Port groups must not overlap and contain at least one logical
port, so the maximum number of port groups is equal to the number of ports of the analyzer.
Example: Using port groups on a 4-port analyzer
A 4-port analyzer can be used for parallel measurements if only 1-port, 2-port or 3-port parameters are
needed:
 Combining ports 1 and 2 to a first port group, ports 3 and 4 to a second port group leaves two sets
of 2-port parameters to be measured in parallel. The measurement provides 2 * 4 = 8 S-
parameters and is faster than a full 4-port measurement (16 parameters).
 A reflection measurement involving four port groups, each with a single port, provides 4
parameters and is faster than the measurement with two groups of 2 ports.
The defined port groups are indicated in the first column of the Port Configuration table (Meas).
Always select the balanced port configuration before defining port groups. When a new balanced port
is created, the analyzer deletes all existing port groups.
In remote control, there is an alternative way to create a port group, based on specifying the set of
Measured Ports (see SOURce<Ch>:GROup<group_no>:PORTs). It allows to define a single group with
arbitrary non-empty port range. However this port group cannot be measured simultaneously with other
port groups.
Remote control:
SOURce<Ch>:GROup<group_no> <log_port1>,<log_port2>
SOURce<Ch>:GROup<group_no>:CLEar [ALL]
SOURce<Ch>:GROup<group_no>:COUNt
SOURce<Ch>:GROup<group_no>:SIMultaneous:STATe
Frequency Offset
The Frequency Offset tab of the Balanced Ports and Port Groups dialog defines a frequency offset
between different port groups which can be used in situations where "Crosstalk" between different DUTs
(e.g. in wafer prober applications) would otherwise make the simultaneous measurement of port groups
impossible.