Common measurement settings
R&S
®
FSVA3000/ R&S
®
FSV3000
400
User Manual 1178.8520.02 ─ 08
difference whether the setting is performed by an open-circuit voltage or by a short-cir-
cuit current. A DC return path is ensured via the 75
Ω
resistor, which is an advantage
in some mixers.
Conversion loss tables
Conversion loss tables consist of value pairs that describe the correction values for
conversion loss at certain frequencies. Correction values for frequencies between the
reference values are obtained by interpolation. Linear interpolation is performed if the
table contains only two values. If it contains more than two reference values, spline
interpolation is carried out. Outside the frequency range covered by the table the con-
version loss is assumed to be the same as that for the first and last reference value
(see
).
Figure 6-15: Conversion loss outside the band's frequency range
Predefined conversion loss tables are often provided with the external mixer and can
be imported to the R&S
FSV/A.
Alternatively, you can define your own conversion loss tables. Conversion loss tables
are configured and managed in the "Conversion loss Table Settings" tab of the "Exter-
nal Mixer Configuration" dialog box.
See
"Managing conversion loss tables"
on page 413 for more information about con-
version loss tables.
When using external mixers with optional bandwidth extensions larger than 400
MHz,
special conversion loss tables are required, see
"External mixers and large bandwidth
Importing CVL tables
The conversion loss table to be used for a particular measurement range is also
defined in the "External Mixer Configuration" dialog box.
The frequency range that the cvl table must cover depends on the used IF, which var-
ies depending on the instrument and installed bandwidth extension options. Thus,
Data input and output
