1Measurement Example - Displaying The Af Of An Fm Carrier - Rohde & Schwarz R&S FSP Series Operating Manual

R&S FSP
2.5.2.1 Measurement Example – Displaying the AF of an FM carrier
Test setup:
generator
Settings on the signal generator (e.g. R&S SMIQ):
Frequency:
Level:
Modulation:
Measurement with the R&S FSP:
1. Set the R&S FSP to its default state
2. Set the center frequency to 99.64 MHz and the span to 300 kHz.
3. Set a resolution bandwidth of 300 kHz.
4. Set a display range of 20 dB and shift the filter characteristics to the middle
of the display.
Operating Manual 1164.4556.12 - 06
Signal
FSP
100 MHz
-30 dBm
FM 0 kHz deviation (i.e., FM = off), 1 kHz AF
Press the PRESET key.
The R&S FSP is in its default state.
Press the FREQ key and enter 99.64 MHz.
Press the SPAN key and enter 300 kHz.
Press the BW key.
Press the RES BW MANUAL softkey and enter 300 kHz.
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 spinwheel, 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.
Getting Started
Measurements on Modulated Signals
2.27