Instrument Function
R&S
®
SMC100A
126
Operating Manual 1411.4060.32 ─ 04
The combined dialog "ALC / UCOR" is divided into the several sections and provides
access to the "Automatic Level Control" settings and to function "User Correction", see
chapter 5.3.8.2, "User Correction"
State - ALC
Activates/deactivates internal level control.
"Auto"
The instrument selects the most appropriate ALC mode automatically.
ALC is on in most operating conditions. Default state.
"On"
Activates ALC, regardless of the operating conditions.
If "Attenuator Mode Fixed" is selected in addition, the instrument adjusts
the level of every level and frequency setting.
"Off (Sample &
Hold)"
Deactivates internal level control.
Sample & hold closes the level control loop at every frequency and level
change for a short period of time. The level control voltage is sampled
and then clamped.
SCPI command:
Search Once - ALC
Forces the generator to execute level adjustment once, although the "Sample & Hold"
mode is active.
SCPI command:
5.3.8.2
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.
RF Signal - RF Block
