User manual

3390-900-01 Rev. C / January 2009 Return to Section Topics 5-15
Model 3390 Arbitrary Waveform Generator User’s Manual Section 5: Waveform Output Operations
To set up FSK modulation:
1. Select the carrier waveform (Sine, Square, Ramp, or Arb). Follow the instructions for
setting up that specific waveform as given in this publication. Refer to Section 4, Setup
Basics for assistance.
2. Press the Mod key to access the modulation menu.
3. Press the soft key under Type; then press the soft key under FSK to select FSK modulation
(Figure 5-14). An FSK modulation output will be generated with the set parameters.
Figure 5-14:
Press the soft keys corresponding with FSK
4. Press the soft key under Src to select between internal source (Int) and external source
(Ext) for the modulating waveform (Figure 5-14). If internal source is selected, press the soft
key under FSK / Rate. Use the navigation wheel with the cursor keys to change the value,
and then press another soft key to finish the entry and exit. Or use the numeric keypad to
enter a desired value and then press the soft key under the desired units to finish the entry,
or the soft key under Cancel to cancel the changes.
5. Press the soft key under Hop / Freq. Use the navigation wheel with the cursor keys to
change the value, and then press another soft key to finish the entry and exit. Or use the
numeric keypad to enter a desired value and then press the soft key under the desired units
to finish the entry, or the soft key under Cancel to cancel the changes.
6. Press the Graph key to view the waveform parameters in the graph mode.
To set up FSK modulation from a remote interface:
FUNCtion {SINusoid|SQUare|RAMP|USER}
FREQuency {<frequency>|MINimum|MAXimum}
VOLTage {<amplitude>|MINimum|MAXimum }
VOLTage:OFFSet {<offset>|MINimum|MAXimum }
FSKey: FREQuency {<frequency>|MINimum|MAXimum}
FSKey:INTernal:RATe {<rate in Hz>|MINimum|MAXimum }
FSKey:SOURce {INTernal|EXTernal}
FSKey:STATe {OFF|ON}
Pulse width modulation waveform
Pulse Width Modulation (PWM) allows the pulse width of the carrier waveform to vary with the
modulating waveform. The pulse width can be specified in either time units or duty cycle.
Carrier waveform
Pulse is the carrier waveform. The default period for the carrier pulse is 1 ms and the acceptable
range is 100 ns to 200 s.
Modulating waveform
The Model 3390 accepts either an internal or external modulating source.
The default source is internal with a default frequency of 10 Hz (the acceptable range is 2 mHz to
20 kHz). The default internal modulating waveform is a sine waveform, but you can also select
from the following: