Rohde & Schwarz SMB100A - Spectral Purity

R&S SMB Test Procedures
1407.0806.82 1.13 E-5
Spectral Purity
Harmonics
Test equipment Spectrum analyzer (Table 1-1, item 18)
Test setup  Connect the spectrum analyzer to the RF output of the DUT.
 Synchronize the reference frequencies of analyzer and DUT.
Measurement  Settings on analyzer:
Reference level = 20 dBm, 10 dB/div.
Span 0 Hz,
Resolution bandwidth 10 kHz
 Settings on DUT:
- Frequency: test frequencies, unmodulated
- Level: test levels
 First measure the level of the fundamental P
f
at the test frequency f
as a reference. Then measure the signal levels P
2*f
and P
3*f
at twice
and three times the carrier frequency f.
 The harmonic spacing is the measured harmonic level referred to
the fundamental:
HD2 = P
f
- P
2*f
HD3 = P
f
– P
3*f
(in dBc = referred to the carrier)
Recommended test
frequencies and levels
Test frequencies:
1 MHz, 5 MHz, 10 MHz, 23.4375 MHz, 23.438 MHz, 46.875 MHz,
46.885 MHz, 65.9 MHz, 66.1 MHz, 93.75 MHz, 93.76 MHz, 143.9
MHz, 186.9 MHz, 187.6 MHz, 264.9 MHz, 374.9 MHz, 375.1 MHz,
529.9 MHz, 530.1 MHz, 749.9 MHz, 750.1 MHz, 1059.9 MHz,
1060.1 MHz, 1100 MHz, 1499.9 MHz, 1500.1 MHz, 2120.9 MHz,
2121.1 MHz, 2200 MHz, 2999.9 MHz, 3000.1 MHz, 3200 MHz,
4241.9 MHz, 4242.1 MHz, 5 GHz, 6 GHz
Test level: +8dBm