Rohde & Schwarz SML01 - Spectral Purity

R&S®SML / R&S®SMV03 Test sequence
1090.3123.12 10.9 E-6
Spectral purity
Harmonic ratio (harmonic spurious)
Test setup  Test setup 1, spectrum analyzer mode
Settings on the R&S
SML01
- LEVEL: max. level as data sheet
- FREQ: Test frequencies
100 kHz, 120 kHz, 5 MHz, 76 MHz, 100 MHz, 151 MHz, 200 MHz,
255.25 MHz, 300 MHz, 400 MHz, 500 MHz, 605 MHz, 655.25 MHz,
700 MHz, 1100 MHz
Settings on the R&S
SML02/03 / R&S SMV03
- LEVEL: max. level as data sheet
- FREQ: in addition to the test frequencies for R&S SML01:
1211 MHz, 1700 MHz, 2010 MHz, 2010 MHz, 2200 MHz, 3000 MHz,
3300 MHz
Settings with option B3  Test frequencies for harmonics > 20 MHz
Settings with option B10  Additional test level: max. level as data sheet
Settings on the test receiver - C
F = test frequency
- R
eference level = test level +10 dB, 10 dB/div
- SPAN = 300 kHz
- Resolution bandwidth = 30 kHz
Measurement  First measure the level of the fundamental as reference, then look for
signals at double and triple the carrier frequency. When doing so,
make sure that the spectrum analyzer is not overloaded.
Analysis The harmonic ratio is the difference in level between the detected
harmonic referenced to the output signal from the R&S SML / R&S
SMV03 (in dBc = referenced to the carrier)
Spurious suppression (nonharmonic spurious)
Test setup  Test setup 1, spectrum analyzer mode
Settings on R&S SML /
R&S SMV03
- UTILITIES  REF OSC  SOURCE EXTERN
- LEVEL: 13 dBm (R&S SML02/03: 11 dBm)
- FREQ:
Test frequencies for spurious
966.052 MHz, 927.2776 MHz, 945.821 MHz, 979.713 MHz, 980.729
MHz, 987.315 MHz, 999.998 MHz, 1022.438 MHz, 1060.872 MHz,
1080.003 MHz, 1086.2 MHz, 1086.663 MHz, 1086.9535 MHz,
1090.28 MHz, 1095.002 MHz, 1098.956 MHz
Look in the range ± (10 kHz to 2MHz)
- Test frequencies for mixer spurious
75.9 MHz
Look in the region of 875.9 MHz
Settings on the test receiver - S
tart frequency = test frequency – 5 kHz
- R
eference level = test level +3 dB, 10 dB/div
- SPAN = 100 kHz
- Resolution bandwidth = 1 kHz
- Switch on average: 5 samples
Measurement  First measure the level of the fundamental as reference, then