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15
Evaluating Your Measurement Results
Evaluating the Results
Evaluating the Results
Looking For Obvious
Problems
15-2
E5500 Phase Noise Measurement System Version A.02.00
This chapter contains information to help you evaluate and output
the results of your noise measurements. The purpose of the
evaluation is to verify that the noise graph accurately represents the
noise characteristics of your unit-under-test (UUT). To use the
information in this chapter, you should have completed your noise
measurement, and the computer should be displaying a graph of its
measurement results. Storing the measurement results in the Result
File is recommended for each measurement.
These steps provide an overview of the evaluation process.
G
Look for obvious problems on the graph such as discontinuity
(breaks).
G
Compare the graph against known or expected data.
G
If necessary, gather additional data about the noise
characteristics of the UUT.
Some obvious problems on a graph are as follows:
G
Discontinuities or breaks in the graph.
G
A higher than expected noise level.
G
Spurs that you cannot account for.
G
Noise that exceeds the small angle criterion line on a L(f) graph).
Document Part No. E5500-90024 Ed. 1.0
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