R&S ZVB - Page 1005

R&S
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ZVA / R&S
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ZVB / R&S
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ZVT Command Reference
SCPI Command Reference
Operating Manual 1145.1084.12 – 30 990
A balanced port configuration generally introduces a new set of mixed mode measured quantities.
Therefore the traces must be redefined when a balanced port is created. To avoid any inconsistencies the
analyzer deletes all traces when SOURce<Ch>:LPORt<log_port> is used to define a balanced port.
When defining a single-ended logical port no traces are deleted.
SOURce<Ch>:LPORt<log_port> cannot be used to dissolve balanced ports. If <phys_port1> or
<phys_port2> is part of a balanced port, this command will fail. Balanced ports must be dissolved
explicitly using SOURce<Ch>:LPORt:CLEar before the physical ports can be reused.
With redefined logical ports only S-, Y-, and Z-Parameter measurements are supported – except in
True Differential Mode, where wave quantities and ratios can also be measured.
<Ch>
Channel number.
<log_port>
Logical port number used to number balanced or physical ports. If unspecified
the numeric suffix is set to 1.
Range [def. unit]
One balanced port requires two physical ports, so the maximum number of
balanced ports for an n-port analyzer is n/2 (n even) or (n – 1)/2 (n odd). If the
command is used to define a single-ended logical port, or if the command is
used as a query, then <log_port> can range up to n (no balanced ports, see
example below). [–]
<phys_port1>,
<phys_port2>
Physical port numbers. If <phys_port2> is omitted, a single-ended logical port is
defined. If <phys_port1> or <phys_port2> are part of a balanced port, this
command fails. Both parameters must be omitted if the command is used as a
query.
Range [def. unit]
1 to n where n is the number of ports of the analyzer. The port numbers must be
different from each other. Moreover, a physical port cannot be assigned to
several logical ports. [–]
SCPI, Command
Types
Device-specific, command or query
Example:
*RST; :SOUR:LPOR1 1,2; LPOR2 3,4
Assuming that the analyzer provides 4 test ports, combine the physical ports 1
and 2 to the logical port 1, the physical ports 3 and 4 to the logical port 2.
SOUR:LPOR1?
Query the physical ports assigned to logical port no. 1. The response is 1,2.
SOUR:LPOR:CLE ALL
SOUR:LPOR1?
Dissolve all logical ports and repeat the query. The response is 1: the logical
port no. 1 is identical to the physical port no. 1.
SOURce<Ch>:LPORt<log_port>:CLEar [ALL]
Dissolves either a single balanced logical port (<log_port>) to single-ended ports, or ALL logical ports to
the default port configuration (1:1 mapping between physical and logical ports).
Also in the former case, when the last balanced port is dissolved, the default port configuration is restored.
Traces that are incompatible with the resulting logical port configuration are reset to the default