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FSKey Subsystem

The FSKey subsystem configures a frequency-shift keying (FSK) waveform.

Example

This summarizes the steps required to generate an FSK waveform.

1. Use FUNCtion, FREQuency, VOLTage, and VOLTage:OFFSet commands to select the function, frequency, ampli-

tude, and offset of the carrier waveform.

2. Select modulation source (internal, external, CH1, or CH2):FSK:SOURce. For an external modulation

source, skip steps 3 and 4.

3. Select alternate ("hop") frequency: FSK:FREQuency

4. Set FSK rate: FSK:INTernal:RATE

5. Enable FSK Modulation: FSK:STATe ON

[SOURce[1|2]:]FSKey:FREQuency {<frequency>|MINimum|MAXimum}

[SOURce[1|2]:]FSKey:FREQuency? [{MINimum|MAXimum}]

Sets the FSK alternate (or "hop") frequency.

Parameter Typical Return

1 μHz to maximum instrument frequency (200 kHz limit for ramps), default 100 Hz +1.000000000000000E-06

Set hop frequency to 10 kHz:

FSK:FREQ 10000

Set hop frequency to 1 μHz:

FSK:FREQ MIN

[SOURce[1|2]:]FSKey:INTernal:RATE {<rate_in_Hz>|MINimum|MAXimum}

[SOURce[1|2]:]FSKey:INTernal:RATE? [{MINimum|MAXimum}]

Sets the rate at which output frequency "shifts" between the carrier and hop frequency.

Parameter Typical Return

1 mHz to 1 MHz, default 100 Hz +1.000000000000000E-03

Set FSK rate to 10 kHz:

FSK:INT:RATE 10000

Set FSK rate to 1 mHz:

FSK:INT:RATE MIN

l The FSK rate is used only with the internal source (FSK:SOURce INTernal).

l The modulating waveform is a square wave with a 50% duty cycle.

Agilent 33500 Series Operating and Service Guide 207

Agilent Technologies Agilent 33500 Series User Manual

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