Rohde & Schwarz R&S FSP Series, Operating Manual

Page: 357 / 796

Operating Manual 1164.4556.12 - 06 4.285
R&S FSP Instrument Functions
LO/IF ports for external mixers - Option R&S FSP-B21
4. Level correction
The conversion loss of the mixer can be taken into account both as a function of
frequency and with an average value. The frequency-dependent level correction
is used in this example for obtaining a higher precision. First select a table valid
for the selected band. As an alternative, level correction based on average value
can be used (see
“Level correction with average value” on page 4.286 ).
5. Frequency-dependent level correction
➢
Activate a selection list which contains all tables stored on the hard disk of the
R&S FSP with
[
FREQUENCY : EXTERNAL MIXER : SELECT BAND]
➢
Select the CONV LOSS TABLE field by means of the cursor keys.
➢
If a file with correction data already exists for the mixer used, select a table
valid with the cursor keys or the rotary knob and confirm with
ENTER .
➢
If such a table is not yet available, create a new table with
[CONV LOSS TABLE : EDIT TABLE]
or copy from a disk to the hard disk of the R&S FSP with
[CONV LOSS TABLE : LOAD TABLE]
(See section “Conversion Loss Tables” on page 4.271 )
and select the file created or loaded from a disk in the selection list as
described before.
A selected file is marked by
√
and will be drawn into the table SELECT BAND.
No further settings are necessary since the selected file contains all required
parameters.
➢
Quit the SELECT BAND menu using
[ ESC ] key
A span is automatically set which covers the whole V band (50 to 75 GHz).
➢
Set the frequency range to be examined using
[ FREQUENCY START : 52 GHz ]
and
[ FREQUENCY STOP : 60 GHz ]
➢
Reduce video bandwidth with
[
SWEEP COUPLING : VIDEO BW MANUAL : 1 MHz ]
A correct signal identification using AUTO ID is thus possible (see also
“Remarks Concerning Signal Identification with AUTO ID” on page 4.278 ).
The display shown in Fig. 4.41 is obtained.