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The Noise Level of
the Reference
Source
Document Part No. E5500-90024Ed. 1.0
Figure 6-4
shows the relationship between the R (signal) input level
and the system noise floor.
Figure 6-4 Relationship Between the R Input Level and System Noise Floor
Unless it is below the system's noise floor, the noise level of the
source you are using as the reference source will set the noise floor
for the measurement. When you set up your measurement, you will
want to use a reference source with a noise level that is at or below
the level of the source you are going to measure.
E5500 Phase Noise Measurement System Version A.02.00
Absolute Measurement Fundamentals
What Sets the Measurement Noise Floor?
6
6-7
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