R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT GUI Reference
Channel Menu
Operating Manual 1145.1084.12 – 30 399
Channel – Stimulus – Stop.
[SENSe<Ch>:]SWEep:TYPE IPHase
SOURce<Ch>:TDIF:IMBalance:PHASe:LPORt
SOURce<Ch>:TDIF:IMBalance:PHASe:STARt
SOURce<Ch>:TDIF:IMBalance:PHASe:STOP
CALCulate<Ch>:TDIF:IMBalance:COMPensation[:STATe]
Defined Coherence Mode (for R&S ZVA and R&S ZVT)
With option R&S ZVA-K6, True Differential Mode, the vector network analyzer can also generate several
continuous signals with specific relative amplitude and phase. Typical application examples are
measurements on balanced DUTs or the supply of antenna arrays which are designed for a well-defined
radiation pattern.
True differential mode and defined coherence mode cannot be active at the same time because they
require a different source port configuration. Both modes require an analyzer with at least two independent
internal sources, i.e. a minimum of 3 ports. Defined coherence mode is compatible with arbitrary single-
ended or balanced port configurations. Note, however, that in converter mode all converter ports must be
configured for active power control, i.e. the power control method must not be set to None or Mechanical
Attenuator.
On R&S ZVA67 and on R&S ZVA24/40 network analyzers with four ports and four generators (order
nos. 1145.1110.28/48), all ports have independent internal sources. You can use defined coherence mode
with an arbitrary combination of two source ports.
Defined coherence mode can be used for frequency conversion measurements: The two combined
ports providing the coherent signal must be at the same frequency. The remaining analyzer ports may
measure at a different frequency.
The source ports and the properties of the coherent signals are all defined in the Defined Coherence
Mode dialog. After a system error correction, the coherent signals with the selected properties are
available at the calibrated reference plane.
Defined Coherence mode relies on Enhanced Wave Correction. A consistent system error correction
is essential for accurate coherent waves at the reference planes. You should always perform a full n-port
calibration (TOSM, UOSM or one of the Txx calibration types) of all physical ports involved and change
the reference impedances, if they differ from the default settings. A subsequent source power calibration is
recommended.
The system error correction applies to all a- and b-waves of the n calibrated ports, not only to the waves
with a fixed amplitude and phase relation.
You can also use offset parameters in order to move the reference plane where the analyzer provides an
accurate coherent signal.
Defined Coherence Mode Dialog
Enables the defined coherence mode for signals from different source ports and defines the signal
properties.
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