Agilent Technologies 8360 L Series, Service Manual

Page: 132 / 603

10. Spurious Signals (Line-Related)
Description and Procedure
Use this pro cedure to measure line-related spurs. The syn thesizer is placed at a CW frequency
where the syn thesizer is most sensitive to line-related spurs. The sp ectrum analyzer measures
the RF output oset b y the harmonics of the line p o w er frequency (60 Hz or 50 Hz). T o
eliminate measuring the sp ectrum analyzer line-related spurs, an In v ertron is used to op erate
the sp ectrum analyzer at a dieren t line frequency so that its o wn spurs will not aect the
measuremen t.
The sp ectrum analyzer m ust ha v e the capabilit y of a 10 Hz resolution bandwidth. A wider
resolution bandwidth results in the syn thesizer's phase noise masking the spur.
1. Set the In v ertron for a line frequency of 55 Hz and for normal op erating v oltage.
2. Connect the equipmen t as sho wn in Figure 2-12. Preset the instrumen ts and let them
w arm up for at least one hour.
Figure 2-12. Spurious signals (Line-Related) T est Setup
Equipment
Sp ectrum Analyzer HP/Agilent 8566B
In v ertron California Instrumen ts 501TC
3. T o ac hiev e p eak p o w er, turn on RF p eaking. Set:
4 USER CAL 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Tracking Menu
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Peak RF Always (asterisk on)
4. On the syn thesizer, press:
4 CW 5 4 6.99 5 4 GHz 5
4
POWER LEVEL
5 4
0
5 4
dBm
5
5. On the sp ectrum analyzer, set:
Center Frequency: 6.99 GHz
Frequency Span: 2 kHz
Reference Level: 10 dBm
Scale Log: 5 dB/Division
Resolution Bandwidth: 300 Hz
SweepTime: Auto
Agilent 8360 P erformance T ests
Spurious Signals (Line-Related)
2-45