Instrument Function
R&S
®
SMC100A
137Operating Manual 1411.4060.32 ─ 09
Impact of the NRP-Z Level Control and the Operating Modes
Since the frequency and level of the RF output signal are continuously adjusted during
"NRP-Z Level Control", this operating mode interferes those with varying frequency
and level values.
The reason is, that the generator regularly transmits the output frequency to the con-
nected R&S NRP-Zxx power sensor, which in turn requests the signal generator to
adjust the output level according to its measurement. In contrast to this real time con-
trol loop, for example the list operating mode already generates the RF output signal
on previously optimized frequency and level value pairs. In this case, the "NRP-Z Level
Control" as a second control loop would impact the already determined RF signal val-
ues and also considerably slow down the measurement. Similar impacts occur in
sweep mode, and also the "NRP-Z Power Viewer" and "NRP-Z Level Control" affect
each other's functionality.
Hence, the operating modes exclude each other as follows:
●
"NRP-Z Level Control" automatically disables NRP-Z Power Viewer, and vice
versa.
●
Activating the RF frequency sweep, RF level sweep or the list mode instantly deac-
tivates a running "NRP-Z Level Control".
●
A running list or RF sweep mode blocks "NRP-Z Level Control". It can not be acti-
vated.
Also keep in mind that modulated signals may differ from CW signals regarding mean
power and peak power. This affects the operation of "NRP-Z Level Control".
NRP-Z Level Control Settings
► To access the dialog for configuring the level control settings, perform one of the
following:
● Select "RF > config... > RF Level > NRP-Z Level Control".
● Press the MENU key and select "RF > RF Level > NRP-Z Level Control".
The dialog contains all parameters for configuring the settings for level control test
setup.
The remote commands required to define these settings are described in Chap-
ter 7.13.11, "SOURce:POWer Subsystem", on page 312
RF Block
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