Agilent 33120A User's Guide

Chapter 3 Features and FunctionsFrequency-Shift Keying (FSK) ModulationFSK RateThe FSK rate is the rate at which the output frequency “shifts” betweenthe carrier frequency and the hop frequency when you select theinternal FSK source.œ FSK rate (internal source): 10 mHz to 50 kHz. The default is 10 Hz.œ The FSK rate is ignored when the external source is selected.œ Front-Panel Operation:9: FSK RATE (MOD MENU)œ Remote Interface Operation:3FSKey:INTernal:RATE {|MINimum|MAXimum}FSK Sourceœ FSK source: Internal or External. The default is Internal.œ When the internal source is selected, the rate at which the outputfrequency “shifts” between the carrier frequency and hop frequencyis determined by the FSK rate specified.œ When the external source is selected, the output frequency isdetermined 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.œ The maximum external FSK rate is 1 MHz.œ The Ext annunciator turns on when the function generator is waitingfor an external trigger signal.œ Front-Panel Operation:10: FSK SRC (MOD MENU)œ Remote Interface Operation:FSKey:SOURce {INTernal|EXTernal}93