Frequency-Shift Keying; Program Example - HP E1340A User Manual

Frequency-Shift Keying

Program Example

Chapter 4
Frequency-shift keying (FSK) changes the frequency of the output
waveform or sample rate based on the signal level of the frequency-shift
keying control source. FSK frequencies can range from 0.0 Hz to
20 MHz. The frequency-shift keying control source is applied to the front
panel " Aux In" BNC Connector.
The command subsystems associated with frequency-shift keying include:
[SOURce:]ROSCillator
[SOURce:]FREQuency
- FSK mode and related commands
The following program shows the basic steps involved in setting up and
using the frequency-shift keying function of the AFG. A 5V, 1 kHz square
wave control signal is applied to the AFG's front panel " FSK" port. Output
frequencies of 20 kHz and 10 kHz occur as the level of the 1 kHz signal
changes.
Using the flowchart as a guide, the steps of this program are:
1. Select the Reference Oscillator -
[SOURce:]ROSCillator:SOURce <
2. Select the Frequency-shift Keying Mode -
[SOURce:]FREQuency:MODE FSK
3. Select the FSK Frequencies -
[SOURce:]FREQuency:FSKey <
4. Set the Output Function -
[SOURce:]FUNCtion[:SHAPe] <
5. Set the Signal Amplitude -
[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude] <
6. Place the AFG in the Wait-for-arm State -
INITiate[:IMMediate]
HP E1340A Sweeping and Frequency-Shift Keying
source >
frequency1 frequency2
>,<
shape >
amplitude
>
>
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