User`s guide

Agilent Technologies E5500 Phase Noise Measurement System 18-17
Reference Graphs and Tables
Agilent/HP 8644B Frequency Limits
How to Access Special
Functions
Press the “Special” key and enter the special function number of your
choice. Access the special function key by pressing the “Enter” key. Press
the [ON] (ENTER) key to terminate data entries that do not require specific
units (kHz, mV, rad, for example)
Example:
[Special], [1], [2], [0], [ON] (Enter).
Description of Special
Function 120
120: FM Synthesis
This special function allows you to have the instrument synthesize the FM
signal in a digitized or linear manner. Digitized FM is best for signal-tone
modulation and provides very accurate center frequency at low deviation
rates. Linear FM is best for multi-tone modulation and provides a more
constant group delay than the Digitized FM.
Table 18-4 Operating Characteristics for Agilent/HP 8644B Modes 1, 2, and 3
Charateristic
Synthisis Mode
Mode 1 Mode 2 Mode 3
RF Frequency Switching Time 90 ms 200 ms 350 ms
FM Deviation at 1 GHz 10 MHz 1 MHz 100 kHz
Phase Noise (20 kHz offset at 1 GHz) -120 dBc -130 dBc -136 dBc