FSK "Hop" Frequency
The maximum alternate ("hop") frequency depends on the function. The default is 100 Hz for all functions. The
internal modulating waveform is a 50% duty cycle square wave.
Function Minimum Hop Frequency Maximum Hop Frequency
Sine 1 μHz 20 MHz
Square 1 μHz 10 MHz
Ramp/Triangle 1 μHz 200 kHz
Pulse 1 μHz 10 MHz
When the External source is selected, the output frequency is determined by the signal level on the front panel Ext
Trig connector. When a logic low is present, the carrier frequency is output. With a logic high, the hop frequency is
output.
SCPI Command
[SOURce[1|2]:]FSKey:FREQuency {<frequency>|MINimum|MAXimum|DEFault}
FSK Rate
The FSK rate is the rate at which the output frequency "shifts" between the carrier frequency and the hop frequency
using the internal FSK source.
– FSK rate (internal source): 125 μHz up to 1 MHz, default 10 Hz.
– The FSK rate is ignored when the external FSK source is selected.
SCPI Command
[SOURce[1|2]:]FSKey:INTernal:RATE {<rate_in_Hz>|MINimum|MAXimum}
FSK Source
May be Internal (default) or External.
– 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. The internal modulating waveform is a 50% duty cycle square
wave.
– When the External source is selected, the output frequency is determined by the signal level on the front panel Ext
Trig connector.When a logic low is present, the carrier frequency is output. With a logic high, the hop frequency is
output.
– The connector used for externally-controlled FSK waveforms (Ext Trig) is not the same connector that is used for
externally-modulated AM, FM, PM, and PWM waveforms (Modulation In). When used for FSK, the Ext Trig connector
does not have adjustable edge polarity.
SCPI Command
[SOURce[1|2]:]FSKey:SOURce {INTernal|EXTernal}
112
Keysight EDU33210 Series User's Guide
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