GUI reference
R&S
®
ZNA
531User Manual 1178.6462.02 ─ 29
ALC Path IF Bandwidth ← Show Advanced Settings
Selects the bandwidth in the ALC control loop.
Values above 100 kHz are only available on the wideband signal path. The 7 MHz filter
was introduced in firmware version 2.40 to improve convergence speed, which allows
shorter pulses with ALC.
"Auto" means, the analyzer selects the appropriate IF bandwidth, depending on the
source frequency and level.
If the Control Loop Parameters are determined automatically, then the "ALC Path IF
Bandwidth" also affects the resulting "Control Loop Parameters".
Remote command:
SOURce<Ch>:POWer:ALC:AUBW
SOURce<Ch>:POWer:ALC:BANDwidth
Control Loop Parameters ← Show Advanced Settings
Defines the tuning coefficients of the proportional-integral (PI) controller the analyzer
uses as a feedback controller for ALC; see "Control loop parameters" on page 117.
By default the parameters are selected by the analyzer firmware ("Coefficients" =
"Auto"). With automatic selection of the ALC Path IF Bandwidth, this option is the only
one. If "ALC Path IF Bandwidth" is set manually, it is also possible to vary the propor-
tional gain "Kr", the integration time "Ti", and the "Control Time" manually.
The latter specifies the maximum duration of the control loop phase, per measurement
point. With "Auto Settling" enabled, the firmware exits the control loop when the con-
vergence criteria are met, and does not wait until the "Control Time" has elapsed.
Remote command:
SOURce<Ch>:POWer<Pt>:ALC:PIParameter
SOURce<Ch>:POWer<Pt>:ALC:PIParameter:GAIN
SOURce<Ch>:POWer<Pt>:ALC:PIParameter:ITIMe
SOURce<Ch>:POWer:ALC:PIParameter:CTIMe
SOURce<Ch>:POWer:ALC:PIParameter:ASETtling
5.8.2.4 Cal Premeas Config dialog
Enables and configures calibration (i.e. power correction) from previous measure-
ments.
Access: Channel – [Pwr Bw Avg] > "Power" > "Cal Premeas Config..."
Stimulus softtool
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