R&S
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ZVA / R&S
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ZVB / R&S
®
ZVT Measurement Examples
Port Conversion
Operating Manual 1145.1084.12 – 30 90
You can also access all the described settings from the Measurement Wizard.
Performing an amplitude or phase imbalance sweep...
Amplitude or phase imbalance sweeps are special sweep types in true differential mode. The analyzer
generates a balanced signal at one of its logical ports, however, the amplitude of one signal component or
the relative phase of the two components is varied according to a selected sweep range.
In the following examples we use a 2-port DUT with balanced input and balanced output and a 4-port
network analyzer as described above.
1. Calibrate your test setup, define the appropriate port configuration and enable true differential
mode as outlined above (Measuring balanced wave quantities and ratios).
To perform an amplitude imbalance sweep,
2. Click Channel – Sweep – Sweep Type: Amplitude Imbalance.
3. In the Amplitude Imbalance Sweep dialog opened, select the logical Port 1 (comprising the
physical ports 1 and 3) as the swept port. The second logical port will continue providing an undisturbed
balanced stimulus signal.
4. Select the CW Frequency and the reference power (Source Power at 0 dB) for the sweep.
5. Close the dialog, click Channel – Stimulus – Start to define the start power of port 3 relative to the
Source Power at 0 dB.
6. Click Channel – Stimulus – Stop to define the stop power of port 3 relative to the Source Power at
0 dB.
7. Click Trace – Measure – More S-Params... and select the measured mixed-mode S-parameter.
8. Click OK to close the More S-Parameters dialog and perform the measurement.
To perform a phase imbalance sweep,
2. Click Channel – Sweep – Sweep Type: Phase Imbalance.
3. In the Phase Imbalance Sweep dialog opened, select the logical Port 1 (comprising the physical
ports 1 and 3) as the swept port. The second logical port will continue providing an undisturbed balanced
stimulus signal.
4. Select the CW Frequency and the constant Source Power for the sweep.
5. Close the dialog, click Channel – Stimulus – Start to define the start phase difference between the
physical ports 3 and 1.
6. Click Channel – Stimulus – Stop to define the stop phase difference between the physical ports 3
and 1.
7. Click Trace – Measure – More S-Params... and select the measured mixed-mode S-parameter.
8. Click OK to close the More S-Parameters dialog and perform the measurement.
Measuring frequency converting DUTs...
In a true differential measurement on frequency-converting DUTs, accurate power levels are of particular
importance. This means that a system error calibration and a subsequent power calibration is required
(see True Differential Mode on Frequency-Converting DUTs).
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