R&S FSW Series, Руководство пользователя

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Common Measurement Settings
R&S
®
FSW
413 User Manual 1173.9411.02 ─ 43
Importing CVL tables
The conversion loss table to be used for a particular range is also defined in the "Exter-
nal Mixer Configuration" dialog box. All tables stored on the R&S
FSW in the
C:\r_s\instr\user\cvl\
directory are offered for selection. A validation check is
then performed on the selected table to ensure that it complies with the settings. In
particular, the following is checked:
●
The assigned band name
●
The harmonic order
●
The mixer type
●
The table must contain at least one frequency that lies within the frequency range
for the band
Reference level
The maximum possible reference level depends on the maximum used conversion loss
value. Thus, the reference level can be adjusted for each range according to the used
conversion loss table or average conversion loss value. If a conversion loss value is
used which exceeds the maximum reference level, the reference level is adjusted to
the maximum value permitted by the firmware.
External Mixers and Large Bandwidth Extension Options
If the bandwidth extension options R&S FSW-B1200/-B2001/-B2000 are active, exter-
nal mixers with a bandwidth up to 2 GHz are supported. For information on which mix-
ers are supported for these bandwidth options, see the R&S FSW data sheet. Two-port
mixers are not supported.
If the bandwidth extension option R&S FSW-B5000 is active, some external (three-
port) mixers with a bandwidth up to 5 GHz are supported. For information on which
mixers are supported for these bandwidth options, see the R&S FSW data sheet. Two-
port mixers are not supported. Instrument models 1312.8000Kxx require an additional
hardware option,R&S
FSW-U21 or R&S FSW-U85.
Measurements with bandwidths over 512 MHz require special conversion loss tables,
with a
.b2g
or
.b5g
file extension. While the common
.acl
files can be used, data
acquisition with larger bandwidths using such conversion loss tables leads to substan-
tial inaccuracy. Using an average conversion loss for the entire range (instead of a
conversion loss table) during data acquisition with the large bandwidth extension
options causes even more inaccuracy. In both cases, the
UNCAL
status message indi-
cates that the measurement can have inaccurate results.
Special conversion loss tables (in
.b2g
or
.b5g
files) cannot be edited within the
R&S FSW firmware; they can only be imported and deleted.
B2000-specific conversion loss tables
A B2000 conversion loss table consists of 43 magnitude correction values (as opposed
to 1 for
.acl
files). To each side of the specific frequency, 21 reference values are
defined with an offset of 25 MHz to 1025 MHz. Thus, correction levels are measured
with a spacing of 50 MHz.
Data Input and Output