R&S SMB Test Procedures
1407.0806.82 1.33 E-5
AM Distortion
Test assembly See section "Standard Test Assembly for Analog Modulations",
page 1.3.
Measurement
Settings on DUT:
RF On
L
evel 0 dBm
Amplitude Modulation menu:
LF Gen Frequency 1 kHz
Source Internal
AM depth 30%.
Settings on R&S FSQ:
AMPTD / REF LEVEL 6 dBm,
FREQ / CENTER test frequency
FM DEMOD,
FMDEMOD ON,
RESULT DISPLAY AM
RESULT DISPLAY AF SPECTRUM
DEMOD BW > 7* f
m
od
,
RANGE DEVIATION PER DIV 20 %
MEAS TIME 0.16 s
Measure the THD for all recommended test frequencies. To
convert the displayed THD value in dB to percent calculate:
THD
pct
= 100 * 10 ^ (THD
dB
/20).
Repeat the measurement with AM depth set to 80 %.
Recommended test
frequencies
100 kHz, 23.4375 MHz; 23.438 MHz, 374.9 MHz; 375 MHz; 529.9
MHz; 530 MHz; 1449.9 MHz; 1450 MHz; 2120.9 MHz; 2121 MHz;
2999.9 MHz; 3000 MHz; 3999.9 MHz; 4 GHz; 6 GHz
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