R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Instrument Functions
LO/IF ports for external mixers - Option R&S FSU-B21
The example of operation is described in the following steps:
1. Test setup
2. Activating the external mixing and selecting the mode
3. Default setting
4. Level correction
5. Frequency-dependent level correction
6. Level correction with average value
7. Taking into account the cable loss in the IF path
8. Functions for signal identification
1. Test setup
➢ Connect the 'LO OUT / IF IN' output of the R&S FSQ to the LO/IF port of the
external mixer.
➢ Connect the multiplier to the external mixer.
➢ Apply a sinewave signal with f = 14.5 GHz to the input of the multiplier.
2. Activating the external mixing and selecting the mode
➢ Activate the external mixing with
[ FREQUENCY : EXTERNAL MIXER ]
3. Default setting
➢ Prior to the measurement select the required band (in this case the V band)
with
[ FREQUENCY : EXTERNAL MIXER : SELECT BAND]
➢ Select the V band using the cursor keys and ENTER
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 4.300).
5. Frequency-dependent level correction
➢ Activate a selection list which contains all tables stored on the hard disk of the
R&S FSQ 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.
4.298 Operating Manual 1313.9681.12 - 01