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17
Reference Graphs and Tables
Agilent 8665B Frequency Limits
How to Access
Special Functions
Description of
Special Functions
120 and 124
17-24
E5500 Phase Noise Measurement System Version A.02.00
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.
124: FM Dly Equalizer
This special function allows you to turn off FM Delay Equalizer
circuitry. When [ON] (The preset condition), 30 µ sec of group delay
is added to the FM modulated signal to get better FM frequency
response.
You may want to turn [OFF] the FM Delay Equalizer circuitry when
the signal generator is used as the VCO in a phase-locked loop
application to reduce phase shift, of when you want to extend the FM
bandwidth to 200 kHz. When [OFF], FM Indicator Accuracy is worse
for rates of 1-5 kHz and better beyond 30 kHz. Refer to the Agilent
8643A/8644B User's Guide for specific details.
Document Part No. E5500-90024 Ed. 1.0
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