General instrument setup
R&S
®
FSVA3000/ R&S
®
FSV3000
726
User Manual 1178.8520.02 ─ 08
Combining multiple correction files
Since the measurement setup may consist of several cables, DUTs and other compo-
nents, multiple Touchstone and frequency response files can be required for full com-
pensation. In this case, the order in which the files are applied is important. The
R&S
FSV/A combines all active Touchstone files to a single S2P file, and creates the
required filter or correction factors for the measurement.
Correction filters for I/Q data
Filters can only be applied to I/Q data if they are defined for the complete analysis
bandwidth. Therefore, if the combined frequency response filter does not cover the
complete analysis span, it is invalid and cannot be used for the measurement. See
also
"Recognizing frequency response correction in measurement results"
on page 726.
For common frequency sweeps, values not covered by the combined frequency
response are not corrected, but the settings remain valid. A message is displayed in
the status bar. See also
"Recognizing frequency response correction in measurement
External preamplifier Touchstone files
If an external preamplifier is connected to the R&S
FSV/A, an additional Touchstone
file is provided by the preamplifier. The combined frequency response filter also con-
siders those values. For your convenience, the external preamplifier can be switched
on and off directly in the "User-Defined Frequency Response Correction" dialog box,
as an alternative to the common input settings.
Correcting data in one or more applications
While transducer files are always used for all measurements on the instrument,
.snp
and
.fres
files can be configured either for the current application only, or for all mea-
surement channels.
Thus, you can configure different files for individual measurement setups with a partic-
ular input source and channel setup. For example, you can set up three different I/Q
Analyzer channels in parallel and use different Touchstone files for each measurement
channel.
Recognizing frequency response correction in measurement results
If frequency response correction is active for a measurement channel, "FRCORR" is
indicated in the channel bar. The status of the correction settings is indicated by the
color of this message:
Frequency response correction (R&S
FSV/A-K544)
