R&S SMB Test Procedures
1407.0806.82 1.31 E-5
Amplitude Modulation
AM Setting Uncertainty
Test assembly See section "Standard Test Assembly for Analog Modulations",
page 1.3.
Measurement of accuracy
versus modulation depth
Settings on DUT:
RF On
Frequency 150 MHz
Level: 0 dBm
Amplitude Modulation On
AM Source Internal
LF Gen Frequency 1 kHz
Settings on analyzer:
AMPTD REF LEVEL test level + 6 dB ,
FREQ CENTER 150 MHz
FM DEMOD,
FMDEMOD ON,
RESULT DISPLAY AM
DEMOD BW 50 kHz
RANGE DEVIATION PER DIV 20 %
MEAS TIME 100 ms
set the AM Depth to the recommended modulation depths and
read the modulation depth ±peak/2 from the analyzer.
set DUT to
AM Source External,
AM Ext Coupling AC,
AM Depth 80%,
LF Gen Output On,
Connect LF output to MOD EXT input and read the modulation
depth ±peak/2 from the analyzer.
Recommended modulation
depths
m = 5%, 10 %, 20 %, 40 %, 60 %, 80 %
To Next Page
Loading...
