Rohde & Schwarz SML01 - Page 277

R&S®SML / R&S®SMV03 Test sequence
1090.3123.12 10.27 E-6
PhiM frequency response
Test setup  Test setup 1, demodulator mode
Settings on R&S SML /
R&S SMV03
- LEVEL: 0 dBm
- FREQ: 1 GHz
- MODULATION  PhiM  PhiM DEVIATION: 0.5 rad
FM SOURCE: LFGen
LFGenFreq = 10 Hz to 100 kHz / 500 kHz
PhiM BANDWIDTH STANDARD / WIDE
Settings on the test receiver - D
emodulation: PhiM
- D
etector: Peak
Measurement  Determine the modulation frequency response by varying the
generator frequency of the built-in LF generator in the PhiM menu
from 10 Hz to 100 kHz / 500 kHz. The modulation frequency
response is the difference between the lowest and highest measured
deviation.
Note: Since the frequency response is the same in FM and PhiM, the standard PhiM loop can be
measured in the same way as the FM frequency response.
PhiM total harmonic distortion
Test setup  Test setup 1, demodulator mode
Settings on R&S SML /
R&S SMV03
- LEVEL: 0 dBm
- FREQ: 1075 MHz
- MODULATION  PhiM  PhiM DEVIATION: 5 rad
PhiM SOURCE: LFGen
LFGenFreq = 1 kHz
Settings on the test receiver - D
emodulation: PhiM
- D
etector: Peak
- Activate THD & SINAD
Measurement  Read off the THD value from the test receiver and use the formula
%100
10
1
20
•=

THD
k
to convert to the total harmonic distortion.