R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Getting Started
2.5.2.1 Measurement Example – Displaying the AF of an FM Carrier
Test setup
Settings on the signal generator (e.g. R&S SMIQ)
Measurement with the R&S FSQ
1. Set the R&S FSQ to the analyzer mode
➢ Press the SPECTRUM key.
The R&S FSQ is in the analyzer mode.
Measurements on Modulated Signals
Frequency: 100 MHz
Level: -30 dBm
Modulation: FM 0 kHz deviation (i.e., FM = off), 1 kHz AF
2. Set the center frequency to 99.64 MHz and the span to 300 kHz.
➢ Press the FREQ key and enter 99.64 MHz.
➢ Press the SPAN key and enter 300 kHz.
3. Set a resolution bandwidth of 300 kHz.
➢ Press the BW key.
➢ Press the RES BW MANUAL softkey and enter 300 kHz.
4. Set a display range of 20 dB and shift the filter characteristics to the middle
of the display.
➢ Press the AMPT key.
➢ Press the RANGE LOG MANUAL softkey and enter 20 dB.
➢ Press the NEXT key.
➢ Set the GRID softkey to REL.
➢ Press the PREV softkey.
➢ Using the rotary knob, shift the reference level so that the filter edge intersects
the - 10 dB level line at the center frequency.
The slope of the 300 kHz filter is displayed. This corresponds to the
demodulator characteristics for FM signals with a slope of approx. 5 dB/100
kHz.
Operating Manual 1313.9681.12 - 01 2.31