Agilent 33120A User's Guide

Chapter 4 Remote Interface ReferenceFrequency-Shift Keying (FSK) CommandsFSKey:SOURce {INTernal|EXTernal}Select an internal or external FSK source. The default is INT.[ Stored in volatile memory ]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 (FSK:INT:RATE).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.FSKey:SOURce?Query the internal FSK source. Returns “INT” or “EXT”.FSKey:STATe {OFF|ON}Disable or enable FSK modulation. To ensure proper operation, youshould enable FSK after you have set up the other modulation parameters.Only one modulation mode can be enabled at a time. When you enableFSK, the previous modulation mode is turned off.4FSKey:STATe?Query the state of the FSK mode. Returns “0” (OFF) or “1” (ON).169