Rohde & Schwarz SML01 - Page 274

Test sequence R&S®SML / R&S®SMV03
1090.3123.12 10.24 E-6
Spurious AM in FM
Test setup  Test setup 1, demodulator mode
Settings on the R&S
SML01
- LEVEL: 0 dBm
- FREQ:
10 MHz, 75 MHz, 100 MHz, 300 MHz, 500 MHz, 800 MHz, 1100 MHz
- MODULATION  FM
 FM DEVIATION: 40 kHz
FM SOURCE: LFGen
LFGenFreq = 1 kHz
-
Settings on the R&S
SML02/03 / R&S SMV03
- LEVEL: 0 dBm
- FREQ:
in addition to R&S SML01 test frequencies:
1211 MHz, 1500 MHz, 1818 MHz, 2200 MHz, 3300 MHz
- MODULATION  FM  FM DEVIATION: 40 kHz
FM SOURCE: LFGen
LFGenFreq = 1 kHz
-
Settings on the test receiver - D
emodulation: AM
- D
etector: RMS
- Filter: 20 Hz to 23 kHz
(for the moment measurement must still be carried out with 50 Hz /
100 kHz, since filters are not yet implemented)
Measurement  Set test frequencies on the R&S SML / R&S SMV03 and read off the
AM spurious deviation from the test receiver.
Carrier frequency deviation in FMDC
Test setup  Test setup 1, spectrum analyzer mode
Settings on R&S SML /
R&S SMV03
- UTILITIES  CALIB  FM OFFSET
- UTILITIES  REF OSC  SOURCE: EXTERN
- LEVEL: 0 dBm
- FREQ: 1000 MHz
- MODULATION  MODE: FM int, FM ext AC, FM ext DC, FM two
tone
FM SOURCE: LFGen
LFGenFreq = 1 kHz
FM DEVIATION: 500 kHz
Settings on the test receiver - C
enter frequency = FREQ (R&S SML)
- S
pan = 1kHz
Measurement
 Set the specified FM modes one by one and use Marker  Peak to
determine the frequency. The difference compared to the set RF
frequency on the R&S SML / R&S SMV03 is the center frequency
deviation.
Note: This value is not specified, but is typically < 0.1 % of the set deviation and is therefore <
500 Hz at a set deviation of 500 kHz.