Improving level performance
R&S
®
SMB100B
158User Manual 1178.3711.02 ─ 08
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 correction value
pair; a new line indicator separates the correction values.
For file handling, use the standard functions in the "File Manager", see Chapter 9.8,
"Using the file manager", on page 209.
Collecting correction data
To fill the frequency and power values in the correction table, use one of the following
options:
●
Manually, row by row.
●
Fill the table automatically with linearly interpolated values, calculated from value
range and step size.
●
Acquire the real frequency response characteristics of the used component with
the R&S NRP power sensor, see Understanding the principle of user correction.
Using a power sensor for frequency response measurements
Consider the following when using R&S NRP power sensors to measure the correction
values:
●
Measure the level directly at the input of the DUT.
●
Use the internal correction functions of an R&S NRP power sensor to increase the
measurement accuracy.
●
Use S-parameter to consider the impact of any two-port device like an adapter
between the signal generator and the sensor input.
Interactions and characteristics
Activated user correction is effective in all operating modes.
The RF output level (Level
RF
) is the sum of the level value and the correction for the
particular frequency:
Level
RF
= "Status bar > Level" + "UCOR"
Activated user correction is indicated by the status indication "Lev Ucor" in the "Level"
tile.
User correction
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