Instrument Function
R&S
®
SMU200A
223Operating Manual 1007.9845.32 ─ 15
The level is decreased by 30 dB during "Sample&Hold" measurement.
"Off (Sample &
Hold)"
Internal level control is deactivated.
"Auto"
Default state. Level control is automatically adapted to the operating
states.
"On"
Internal level control is permanently activated.
SCPI command:
[:SOURce<hw>]:POWer:ALC[:STATe] on page 765
Search Once - ALC
Manually activates level control briefly to allow the level to be calibrated (the "Sam-
ple&Hold" setting must be selected).
SCPI command:
[:SOURce<hw>]:POWer:ALC:SONCe on page 764
Protect RF Output - ALC
The signal is attenuated for about 40 dB to protect external devices against internal sig-
nals, if the following prerequisites are fulfilled
●
ALC state is On or AUTO
●
High-Power Mode is Off
●
I/Q Modulator is On
●
Baseband is armed
SCPI command:
:OUTPut<hw>:PROTection:STATe on page 555
5.5.9 User Correction
The "User Correction" function is used to create and activate lists in which level correction
values predefined by the user are freely assigned to RF frequencies. Correction is per-
formed by the user-defined table values being added to the output level for the respective
RF frequency.
With frequencies which are not contained in the list, the level correction is determined by
interpolation of the closest correction values.
The lists are created in the "List Editor". Each list is stored in its own file with the predefined
file extension *. uco. The name of the User Correction file can be freely selected. The
files are loaded from the "Lists..." file manager. Externally created tables with pairs of
frequency and level values can be converted into User Correction files using the import
function. The external files must have the file extension *.txt or *.csv. These file
formats are provided e.g. by the Microsoft Excel program. The separators for table col-
umns and for decimal floating-point numerals can be set. In addition, internally created
User Correction data can be exported into ASCII files using the export function.
The amplitude can also be linearized automatically by means of an R&S NRP power
sensor connected to one of the generator output signals. With the aid of the "Fill with
Sensor" function, a table with correction values for external test assemblies can be auto-
matically determined, e.g. for compensating the frequency response of cables. The User
RF Signal and Analog Modulations - RF Block
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