Spurious Signals (Harmonics & Subharmonics) - Agilent Technologies 83620A Service Manual

8. Spurious Signals (Harmonics & Subharmonics)
Description and Procedure
Use this procedure to measure the synthesizer's harmonics and subharmonics
over its entire frequency range. Harmonics are integer multiples of the
synthesizer RF output frequency and subharmonics are fractional multiples
of the YO frequency. Subharmonics do not exist at all frequencies. In low
band, mixer spurs and fundamental feedthrough are the most signi cant
harmonically-related signals. he mixer spur/YO frequency relationship is as
follows:
X (5.4 GHz xed oscillator)
where X and Y are integers.
Other harmonics are typically direct multiples of the YO frequency.
In this procedure, the synthesizer is manually swept over its frequency range
while the spectrum analyzer measures the harmonics and subharmonics in each
frequency band. Any harmonics or subharmonics that are within 5 dB of the
speci cation are subsequently veri ed with a more accurate procedure.
1. urn on the equipment shown in Figure 2-9 and Figure 2-10. Preset the
instruments and let them warm up for at least one hour.
On the HP 8566B, connect the CAL OU PU to the RF INPU . Press
to calibrate the spectrum analyzer.
SHI T W
5 5
Figure 2-9. purious ignals (Harmonic) Test etup
2-40 Performance Tests
purious ignals (Harmonics ubharmonics)
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0
Y (YO frequency) = Mixer Spur Frequency
20 GHz
HP 8360