HP E1340A User's Manual
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Sweeping
The AFG offers linear frequency sweeping of standard waveforms
(i.e. sine, square, triangle, ramp) and arbitrary waveforms from 0.0 Hz to
15 MHz for sine waves, and 0.0 Hz to 1 MHz for square, triangle, and ramp
waves.
The command subsystems covered in this section include:
• [SOURce:]ROSCillator
• [SOURce:]FREQuency
• [SOURce:]SWEep
Sweeping
Considerations
The AFG only allows for continuous repetitive sweeping. The INITiate
[:IMMediate]
command starts the sweeping at a fixed rate determined by the
number of points in the sweep and the sweep time. For more information on
sweeping, see Chapter 7 under the
[SOURce:]SWEep subsystem.
Sweeping Using
Start and Stop
Frequencies
The following program specifies a start frequency and a stop frequency and
continuously sweeps between 0 and 1 MHz. The program also queries the
start frequency, stop frequency, center frequency, and frequency span to
show the relationship between them.
Using the flowchart as a guide, the steps of this program are:
1. Select the Reference Oscillator -
[SOURce:]ROSCillator:SOURce <source>
2. Select the Frequency Sweep Mode -
[SOURce:]FREQuency:MODE SWEep
3. Set the Start Frequency -
[SOURce:]FREQuency:STARt <start_freq>
4. Set the Stop Frequency -
[SOURce:]FREQuency:STOP <stop_freq>
5. Select the Output Function -
[SOURce:]FUNCtion[:SHAPe] <shape>
6. Set the Signal Amplitude -
[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude] <amplitude>
7. Place the AFG in the Wait-for-arm State -
INITiate[:IMMediate]
85 HP E1340A Sweeping and Frequency-Shift Keying Chapter 4