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Chapter 4 Remote Interface Reference
Frequency-Shift Keying (FSK) Commands
4
FSKey:FREQuency {<frequency>|MINimum|MAXimum}
FSKey:FREQuency? [MINimum|MAXimum]
Set the FSK alternate (or “hop”) frequency. Select from 1
µ
Hz to 80 MHz
(limited to 1 MHz for ramps and 25 MHz for arbitrary waveforms).
The default is 100 Hz. MIN = 1 µHz. MAX = 80 MHz. The :FREQ? query
returns the “hop” frequency in hertz.
• The modulating waveform is a square wave with a 50% duty cycle.
FSKey:INTernal:RATE {<rate in Hz>|MINimum|MAXimum}
FSKey:INTernal:RATE? [MINimum|MAXimum]
Set the rate at which the output frequency “shifts” between the carrier
and hop frequency. Select from 2 mHz to 100 kHz. The default is 10 Hz.
MIN = 2 mHz. MAX = 100 kHz. The :RATE? query returns the FSK rate
in hertz.
• The FSK rate is only used when the Internal source is selected
(FSK:SOUR INT command) and is ignored when the external source
is selected (FSK:SOUR EXT command).
FSKey:STATe {OFF|ON}
FSKey:STATe?
Disable or enable FSK modulation. To avoid multiple waveform changes,
you can enable FSK
after
you have set up the other modulation parameters
.
The default is OFF. The :STAT? query returns “0” (OFF) or “1” (ON).
• The function generator will allow only one modulation mode to be
enabled at
a time. For example, you cannot enable FSK and AM at the
same time
. When you enable FSK, the previous modulation mode is
turned off.
• The function generator will not allow FSK to be enabled at the same
time that sweep or burst is enabled. When you enable FSK, the sweep
or burst mode is turned off.
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