Rohde & Schwarz SML01 - Amplitude Modulation

R&S®SML / R&S®SMV03 Test sequence
1090.3123.12 10.19 E-6
Frequency accuracy and total harmonic distortion
Measuring equipment - Test receiver (table "Measuring Equipment and Accessories", item 1)
synchronized with R&S SML / R&S SMV03
Test setup  Connect the audio input from the receiver to the LF connector of the
R&S SML / R&S SMV03.
Settings on R&S SML /
R&S SMV03
- LF OUTPUT STATE ON
- LF OUTPUT VOLTAGE:
1 V, 4 V
- LF OUTPUT LFGen:
for frequency accuracy: 100 Hz, 1 kHz, 33.33 kHz, 1 MHz
for total harmonic distortion: 20 Hz, 50 Hz, 100 Hz to 100 kHz: 3
values / decade each
Settings on the sinewave
generator
- FREQ:
20 kHz
- Output impedance = 50 Ohm
- Level = 1 V
- Level offset = ± 5 V
Measurement  Read off actual frequency from test receiver
 Read off THD value from test receiver
Total harmonic distortion is calculated by the formula
%100
10
1
20
•=

THD
k
Amplitude modulation
AM deviation setting
Test setup  Test setup 1, demodulator mode
Settings on the R&S
SML01
- LEVEL:
2.1 dBm, 5 dBm, 8 dBm
with R&S SML-B10: 15 dBm
- FREQ:
100 kHz, 5.1 MHz, 1100 MHz
- MODULATION  AM  AM DEPTH:
10 % to 95 % in 20 steps
AM SOURCE LFGen
LFGenFreq = 1 kHz
Settings on the R&S
SML02/03 / R&S SMV03
- LEVEL:
0.1 dBm, 5 dBm, 8 dBm
with R&S SML-B10: 15 dBm
- FREQ:
in addition to the test frequencies for R&S SML01
1211 MHz, 2200 MHz, 2800 MHz, 3300 MHz
- MODULATION  AM  AM DEPTH:
10 % to 95 % in 20 steps
AM SOURCE LFGen
LFGenFreq = 1 kHz