User`s guide

Agilent Technologies E5500 Phase Noise Measurement System 6-1
6 Absolute Measurement Fundamentals
What You’ll Find in This Chapter
This chapter contains information about making absolute phase noise
measurements of signal sources. This information is fundamental to using
the Agilent E5500 phase noise measurement system. It is important that you
understand the concepts contained in this chapter in order to use the system
effectively.
The topics covered in this chapter include:
• The Phase Lock Loop Technique,page6-2
• What Sets the Measurement Noise Floor?,page6-6
• Selecting a Reference,page6-8
• Estimating the Tuning Constant,page6-11
• Tracking Frequency Drift,page6-12
• Changing the PTR,page6-14
• Minimizing Injection Locking,page6-16
• Inserting a Device,page6-18
• Evaluating Noise Above the Small Angle Line,page6-20