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6
Absolute Measurement Fundamentals
Evaluating Noise Above the Small Angle Line
Figure 6-11 Graph of Phase Lock Loop Bandwidth Provided by the Peak Tuning Range
6-22
E5500 Phase Noise Measurement System Version A.02.00
1
Once the beatnote is displayed, press the press [[RANGE]], press
[[AUTO RANGE OFF]], and press [[SINGLE AUTO RANGE]] on
the RF analyzer.
2
Set the span width on the RF analyzer to approximately 4 x PLL
bandwidth. Adjust the BITNET to position it near the center of
the display.
NOTE: If you are not able to tune the beatnote to 2 X PLL bandwidth
(center of display) due to frequency drift, refer to Tracking
Frequency Drift in this section for information about measuring
drifting signals. If you are able to locate the beatnote, but it distorts
and then disappears as you adjust it towards 0 Hz, then your sources
are injection locking to each other. Set the beatnote to the lowest
frequency possible before injection locking occurs and then refer to
"Minimizing Injection Locking"
actions.
3
Press the [[AVG]] key, and then the RMS key. Wait for the trace to
return and then press [[MKR]] and MKR to Peak.
on page 6-17 for recommended
Document Part No. E5500-90024 Ed. 1.0
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