Configuring the Signal in the RF Domain
R&S
®
SMW200A
529User Manual 1175.6632.02 ─ 16
7.8.3 User Correction
The R&S SMW supports a correction function to compensate external losses, as for
example caused by the RF cable, to achieve a precise target input level at the DUT.
About UCOR
User correction (UCOR) is a method that determines the external level loss over a fre-
quency range in advance.
The difference between the generator output level and the level at the DUT determines
the correction value at the respective frequency. Alternatively, the attenuation charac-
teristics over a certain frequency range of e.g. an RF cable are also specified in the
association data sheet.
During signal generation, the generator adds the correction value internally and thus
increases the output level by exactly the amount of the loss between its output and the
DUT. With frequencies which are not contained in the list, the level correction is deter-
mined by interpolation of the closest correction values.
Possible ways for configuring the user correction values
You can configure correction values in the following ways:
●
Internally
– Use the built-in table editor in the "UCOR > Edit User Correction Data" dialog.
Once defined, user correction values can be saved in a file.
Files with correction data can be exported for example, to exchange configura-
tion between instruments or to modify the file content with an external program
and reload them again.
– Using the corresponding remote-control commands.
Note that you have to create a user correction file first.
●
Externally
Create a file with correction values as a CSV file with Microsoft Excel, with a Note-
pad or a similar tool and save it with the predefined extension. Transfer the file to
and load it into the instrument.
UCOR file format
Files containing correction data are simple files in text or comma-separated value
(CSV) file format. The filename is user-definable; the file extension is *.ucor.
The file contains a list of correction values, one row per frequency and level pair; a new
line indicator separates the correction values.
For file handling, use the standard functions in the "File Manager", see Chapter 10.8,
"Using the File Manager", on page 639.
Collecting correction data
To fill the frequency and power values in the correction table, use one of the following
options:
●
Manually, row by row.
Improving Level Performance
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