HP 33120A, User Manual

Page: 84 / 118

FSK Rate
The FSK rate is the rate at which the output frequency “shifts” between
the carrier frequency and the hop frequency when you select the
internal
FSK
source.
•
FSK rate (internal source): 10 mHz to 50 kHz. The default is 10 Hz .
•
The
FSK
rate is ignored when the external source is selected.
•
Front-Panel Operation :
9: FSK RATE (MOD MENU)
•
Remote Interface Operation :
FSKey:INTernal:RATE {< rate in Hz >|MINimum|MAXimum}
FSK Source
•
FSK source:
Internal
or External. The default is Internal.
•
When the internal source is selected, the rate at which the output
frequency “shifts” between the carrier frequency and hop frequency
is determined by the
FSK rate specified.
•
When the external source is selected, the output frequency is
determined by the signal level on the rear-panel FSK terminal.
When a “low”
TTL
level is present, the carrier frequency is output.
When a “high”
TTL
level is present, the hop frequency is output.
•
The maximum external
FSK
rate is 1 MHz.
•
The
Ext
annunciator turns on when the function generator is waiting
for an external trigger signal.
•
Front-Panel Operation :
10: FSK SRC (MOD MENU)
•
Remote Interface Operation :
FSKey:SOURce {INTernal|EXTernal}
3
Chapter 3 Features and Functions
Frequency-Shift Keying (FSK) Modulation
93