Configuring the RF signal
R&S
®
SMM100A
395
User Manual 1179.1341.02 ─ 05
Figure 7-19: Understanding the principle of user correction
DUT
= Device under test
Compo-
nents
= Designation of all components between the measurement equipment and the DUT, e.g.
cables
PS
= Power sensor, e.g. R&S NRP, connected at the DUT's input and the USB connector of the
R&S
SMM100A
1
= Power sensor measures the level over a frequency range, where the collected values corre-
spond to the losses caused by the components between the R&S
SMM100A and the DUT
2
= Obtain the correction data by inverting the collected data; load the correction parameters in
the R&S
SMM100A
3
= In the R&S
SMM100A, the RF signal is pre-processed with the correction values so that the
signal at the outputs is the inverted version of the external losses
4
= Received at the DUT input, the pre-processed signal if flat
With active
UCOR
, the generator adds the correction value internally and thus increa-
ses the output level by exactly the amount of the loss between its output and the DUT.
For frequencies which are not contained in the list, the level correction is calculated 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.
Improving level performance
