R&S FSW Series, Руководство пользователя

Страница: 688 / 1450

General Instrument Setup
R&S
®
FSW
688 User Manual 1173.9411.02 ─ 43
You are asked whether you would like to save the current configuration on the
R&S
FSW first.
4. Select the file name of the transducer factor.
5. Select the decimal separator that was used in the file.
6. Select "Select".
The transducer factor is loaded from the specified file and displayed in the "Edit
Transducer" dialog box.
7. Activate the transducer factor as described in "How to activate and deactivate a
transducer" on page 685.
12.4 Frequency Response Correction (R&S FSW-K544)
If the Frequency Response Correction option (R&S FSW-K544) is installed, the
R&S FSW supports frequency response correction using Touchstone (
.snp
) files
or
.fres
files.
12.4.1 Basics on Frequency Response Correction
Input-specific frequency correction
Frequency response correction can be configured individually for all available input
types (RF, baseband). The settings in the "User-defined Frequency Response Correc-
tion" dialog box apply to the currently selected input type. Be sure to select the appro-
priate input source before you define the correction data (see
Chapter 8.2.2, "Input
Source Settings" , on page 366). In remote operation, be sure to use the correct com-
mand for the required input type (see "Input-specific frequency correction"
on page 1272).
Otherwise the correction may seem to fail because it was defined for a different input
type than the one being used.
Touchstone (.snp) files
Touchstone (
.snp
) files contain data to characterize a measurement setup in respect
to the gain and phase error over frequency. Such files are generated by network ana-
lyzers, for example. The R&S
FSW can use such files to compensate for any gain or
phase errors between the DUT and the connection from the DUT to the instrument.
Touchstone files can be defined for a varying number of input and output ports. The
total number of ports configured in the file is indicated by the file extension; the "n"
in
.snp
is merely a placeholder. Thus, a file for a cable with one input and one output
is referred to as an S2P file. A file for a switch with one input and 3 outputs is referred
to as an S4P file etc.
Frequency Response Correction (R&S FSW-K544)