Power-On/Emf Settings; Automatic Level Control - Alc - R&S SMB100A Operating Manual

®
R&S SMB100A
By default the instrument uses correction data obtained in the factory before delivery.
In exceptional cases, you can determine the calibration values with an R&S NRP
power sensor, and use these values for the external level correction. This feature is a
protected function (see Service Manual, chapter 2, "Adjustment").
Adjustment Data
Indicates what data has been used for level calibration.
Remote command:
:CALibration<hw>:LEVel:EXTern:DATA
5.3.5.3

Power-On/EMF Settings

The power-on behavior of the R&S SMB and the level display in the display header are
set in the "Power-On / EMF Settings" section of the "RF Level/EMF" dialog.
To open the "RF Level/EMF" dialog, select "RF > Configure > EMF" or use the MENU
key under "RF".
Power-On State - RF Signal
Selects the state which the RF output is to assume after the instrument is switched on.
"RF Off"
"Previous Set-
ting"
Remote command:
:OUTPut<hw>[:STATe]:PON
Display Level as Voltage of EMF - RF Level
Activates display of the signal level as voltage of the EMF (no-load voltage). If this set-
ting is deactivated, the level is displayed as a voltage over a 50 Ohm load.
Note: This setting is not affected by an instrument preset (PRESET key), *RST) or the
"Save/Recall" function. Only the
resets the setting.
Remote command:
[:SOURce<hw>]:POWer:EMF:STATe
5.3.5.4

Automatic Level Control - ALC

Your signal generator is equipped with an automatic level control unit to obtain best RF
level accuracy.
Automatic Level Control (ALC) is an adaptive control system to stabilize the RF output
level. It continuously monitors the current level and adjusts it to keep a steady state
over temperature and time.
Operating Manual 1407.0806.32 ─ 21
The output is deactivated when the instrument is switched on.
When the instrument is switched on, the output assumes the same
state as it had when the instrument was switched off.
on page 315
Chapter 5.2.3.20, "Factory
on page 287
Preset",
on page 378
Instrument Function
RF Block
on page 120
151