R&S SMB Test Procedures
1407.0806.82 1.37 E-5
FM Distortion
Test Method FFT Demodulation (see chapter "Test ")
Measurement
Settings on DUT:
RF On
Level 0 dBm:
Frequency Modulation menu:
State on
FM Source Internal
FM Mode Normal
LFGen Frequency 2 kHz.
Settings on R&S FSQ:
DEMOD BW 5 * FM deviation,
RANGE / DEVIATION PER DIV 250 kHz,
RESULT DISPLAY / FM, AF SPECTRUM,
SWEEP / MEAS TIME 2.5 ms,
FREQ / AF STOP 50 kHz.
Read the THD from the display. To convert to percent calculate
THDpct = 100 * 10 ^ (THDdB/20).
Recommended settings
CF sweep
Recommended test frequencies
with FM deviation 250 kHz: 10 MHz,
with FM deviation 500 kHz: 375.1 MHz, 500 MHz, 625 MHz, 750
MHz,
with FM deviation 1 MHz: 1100 MHz,
with FM deviation 2 MHz: 2200 MHz,
with FM deviation 4 MHz: 3200 MHz, 6 GHz
Repeat measurement with changing settings to
FM Mode Low Noise
FM deviation 500 kHz
for test frequencies: 375.1 MHz, 750 MHz
Repeat measurement with changing settings to
FM Mode High Deviation
FM deviation 500 kHz
for test frequencies: 375.1 MHz, 750 MHz
To Next Page
Loading...
