Table of Contents
Advertisement
Table 18-2
How to Access Special
Functions
Description of Special
Functions 120 and 125
Operating Characteristics for Agilent/HP 8643A Modes 1, 2, and 3
Charateristic
RF Frequency Switching Time
FM Deviation at 1 GHz
Phase Noise (20 kHz offset at 1 GHz)
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).
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.
125: Wide FM Deviation (Agilent/HP 8643A only)
Mode 1 operation can be selected using this special function, which allows
you to turn on wide FM deviation. The Agilent/HP 8643 defaults to Mode 2
operation. Wide FM deviation provides the maximum FM deviation and
minimum RF output switching time. In this mode, the maximum deviation is
increased, by a factor of 10, to 10 MHz (for a 1 GHz carrier). The noise level
of the generator is also increased in this mode, however.
Agilent Technologies E5500 Phase Noise Measurement System 18-15
Reference Graphs and Tables
Agilent/HP 8643A Frequency Limits
Synthisis Mode
Mode 1
Mode 2
90 ms
200 ms
10 MHz
1 MHz
-120 dBc
-130 dBc
Advertisement
Table of Contents
