R&S SMU200A Test Procedures
1007.9845.82 1.35
E-12
FM Distortion
Test Method
FFT Demodulation (see chapter "
Test Methodes")
Measurement
Settings on DUT
:
RF
On
Level 0 dBm
Frequency Modulation menu:
LF Gen Frequency 10 kHz
Source Internal
FM deviation 1 MHz.
Settings on R&S FSQ
:
DE
MOD BW 5 MHz,
RANGE / DEVIATION PER DIV 250 kHz,
RESULT DISPLAY / FM, AF SPECTRUM,
SWEEP / MEAS TIME 2.5 ms,
FREQ / AF STOP 50 kHz.
Read THD from the display. To convert to percent calcul
ate
T
HDpct = 100 * 10 ^(THDdB/20).
Recommended settings
CF sw
eep
10 M
Hz, 250 MHz, 500 MHz, 812 MHz, 940 MHz,
1067 MHz, 1194 MHz, 1321 MHz, 1484 MHz, 2200 MHz,
4000 MHz, 6000 MHz.
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