GUI reference
R&S
®
ZNA
526User Manual 1178.6462.02 ─ 29
For power sweeps, the Start Power / Stop Power can be set on the Stimulus tab of the
"Stimulus" softtool.
Some of the buttons on the "Power" tab open related dialogs.
●
"Power Config...": see Chapter 5.8.2.2, "Power Config dialog", on page 527
●
"ALC Config...": see Chapter 5.8.2.3, "ALC Config dialog", on page 527
●
"Cal Premeas Config...": see Chapter 5.8.2.4, "Cal Premeas Config dialog",
on page 531
Power
Determines the output power at the test ports for the sweep types "Lin Freq", "Log
Freq", "CW Mode", and "Time". Also determines the default output power for "Segmen-
ted" sweeps, where the output power can be set per segment.
The setting has no effect for Power sweeps, where the source power is varied over a
continuous range.
Remote command:
SOURce<Ch>:POWer<PhyPt>[:LEVel][:IMMediate][:AMPLitude]
Source Step Att.
This section is only available if the R&S ZNA is equipped with mechanical source step
attenuators (see Chapter 4.7.29, "Source step attenuators", on page 308).
Attenuation can be set from 0 to 70 dB, in steps of 10 dB.
If an external switch matrix is used, this section is also hidden. The "Source Step Att."
functionality can be configured in the Arbitrary Power tab of the Chapter 5.12.2.2, "Port
Settings dialog", on page 668.
Remote command:
SOURce<Ch>:POWer<PhyPt>:ATTenuation
ALC On
Enables/disables automatic level control (ALC) for the current channel.
If mm-wave converters are involved in the setup, the VNA firmware checks whether
suitable leveling data are active. Otherwise a warning message is displayed and ALC
remains disabled (although the checkbox is checked).
Use Power Cal dialog – Leveling Table to create a leveing dataset and Leveling Data-
sets dialog to activate it. For background information see "ALC with mmWave convert-
ers" on page 119.
Remote command:
SOURce<Ch>:POWer:ALC:CSTate
RF Off All Channels
"RF Off All Channels" switches the internal power source for all channels off (if
checked) or on. Switching off the RF power helps to prevent overheating of a connec-
ted DUT while no measurement results are taken.
Tip: Switching off the internal RF sources while an external generator is used can
improve the measurement accuracy. "RF Off All Channels" also deactivates external
generators, so you have to use the settings in the "Arb Frequency" tab of the Port Set-
tings dialog (with option R&S ZNA-K4).
Stimulus softtool
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