Agilent Technologies E5503A Guia do Utilizador descarregar pdf (Página 109)

100

101

Agilent Technologies E5500 Phase Noise Measurement System

6-7

Absolute Measurement Fundamentals

What Sets the Measurement Noise Floor?

Figure 6-4 Relationship Between the R Input Level and System Noise Floor

The Noise Level of the

Reference Source

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.

The following graph demonstrates that as the noise level of the reference

source approaches the noise level of the UUT, the level measured by the

System (which is the sum of all noise sources affecting the system) is

increased above the actual noise level of the UUT.

Figure 6-5 Increase in Measured Noise as Reference Source Noise Approaches UUT Noise

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 464 465

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