GUI reference
R&S
®
ZNA
477
User Manual 1178.6462.02 ─ 20
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
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 4.7.28, "Source step attenuators"
Attenuation can be set from 0 to 70 dB, in steps of 10 dB.
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
to activate it. For background information see
Remote command:
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
ZNA-K4).
Remote command:
Receiver Step Att.
Defines an attenuation factor for the received waves at each analyzer port. At least one
receiver step attenuator must be installed to use this feature; see
Receiver step attenuators are used to adapt the received signal level to the input level
range of the analyzer. They protect the instrument from being overloaded or damaged,
e.g. if the DUT is a power amplifier.
Stimulus softtool