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17
Reference Graphs and Tables
Agilent 8643A Frequency Limits
How to Access
Special Functions
Description of
Special Functions
120 and 125
17-16
E5500 Phase Noise Measurement System Version A.02.00
Table 17-3 Operating Characteristics for Agilent 8643A Modes 1, 2, and 3
Characteristic
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 8643A only)
Mode 1 operation can be selected using this special function, which
allows you to turn on wide FM deviation. The Agilent 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.
Synthesis Mode
Mode 1
Mode 2
90 ms
200 ms
10 MHz
1 MHz
-120 dBc
-130 dBc
Document Part No. E5500-90024 Ed. 1.0
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