Common measurement settings
R&S
®
FSVA3000/ R&S
®
FSV3000
422
User Manual 1178.8520.02 ─ 08
To activate and configure the external mixer
1. Select "INPUT > Input Source Config > External Mixer: ON" to activate the external
mixer for the current application.
2. Select "Mixer Settings > Band" to define the required frequency range.
3. From the "Band" selection list, select the band "V".
4. In the Mixer Settings, select "Conversion Loss: Table" for Range
1 to define fre-
quency-dependent level correction.
5. From the selection list, select a conversion loss table stored on the instrument. No
further settings are necessary since the selected file contains all required parame-
ters. If the selected table is not valid for the selected band, an error message is dis-
played.
If no conversion loss table is available yet, create a new table first (as described in
"To define a new conversion loss table"
6. A span is automatically set which covers the whole V band (50
GHz to 75
GHz).
7. Reduce the video bandwidth by selecting "BW > Video Bandwidth Manual":
1
MHz
. This allows for correct signal identification using the Auto ID function (see
"Automatic signal identification"
8. Select "Basic Settings> Auto ID: On" to activate automatic signal identification.
9. Adapt the tolerance limit by selecting "Basic Settings> Auto ID Threshold". The tol-
erance limit is set to
5 dB
in this example.
To take into account the cable loss in the IF path
On performing level correction, the conversion loss of the mixer and also the insertion
loss a
0
of the cable used to tap off the IF signal are to be taken into account. This addi-
tional loss is frequency-dependent.
1. Determine the insertion of the cable at the used intermediate frequency.
2. Increase each reference value in the conversion-loss table by the insertion loss
(a
0
).
a) Select "INPUT > Input Source Config > External Mixer > Conversion Loss
Table".
b) Select the assigned conversion loss table.
c) Select "Edit Table".
d) Select "Shift y" and enter the insertion loss value
<a
0
>
to shift all y-values in the
table by this value.
3. Select "Save".
Measurement example 2: three-port mixer with a large analysis bandwidth
The following example demonstrates the operation of an external three-port mixer with
a large analysis bandwidth in the I/Q Analyzer. This example requires the optional
Data input and output
