R&S SM300 - LF-Spurious; Residual FM; Residual am; Amplitude Modulation

Manual Test Procedure R&S SM300
Version 04 78
Service Manual SM300: 1147.1652.00 Instrument Part No SM300: 1147.1498.03
Settings on SM300
Test frequency: 10 Hz, 100 Hz, 1 kHz, 10 kHz, 80 kHz
Measurement
Measure frequency response.
The frequency response is the difference between the highest and lowest
level.
2.4.7.3 LF-Spurious
Test equipment
Modulation analyzer (synchronized with SM300)
Test setup
Connect LF voltmeter input of modulation analyzer to LF connector of
SM300.
Settings on SM300
Frequencies: 10 kHz, 20 kHz, 80 kHz
Measurement
1. Read actual frequency on audio or spectrum analyzer.
2. Read distortion on audio analyzer.
2.4.7.4 Residual FM
Test setup
Test setup 1 with modulation analyzer
Settings on SM300
 LEVEL 0 dBm
 FREQ 1 GHz
Setting on
modulation analyzer
 Demodulation: FM
 Detector: RMS
 Filter: ITU-T (CCITT) or 20 Hz to 23 kHz
Measurement
Read frequency deviation on modulation analyzer on both filters.
2.4.7.5 Residual AM
Test setup
Connect modulation analyzer to RF output of SM300
Settings on SM300
 LEVEL 0 dBm
 FREQ 1 GHz
Setting on
modulation analyzer
 Demodulation: AM
 Detector: RMS
 Filter: 20 Hz to 23 kHz
Measurement
Read residual AM on modulation analyzer.
2.4.8 Amplitude Modulation
2.4.8.1 AM Deviation Setting
Test setup
Test setup1 with modulation analyzer
Settings on SM300
 LEVEL 0 dBm
 FREQ 666 MHz
 Test deviation of AM deviation: 1%, 30%, 80%
LFGenFreq 1 kHz
Measurement
Read modulation depth on modulation analyzer.