User manual

5-12 Return to Section Topics 3390-900-01 Rev. C / January 2009
Section 5: Waveform Output Operations Model 3390 Arbitrary Waveform Generator User’s Manual
3. Press the soft key under Type; then press the soft key under FM to select frequency
modulation (Figure 5-12). A frequency modulation output will be generated with the set
parameters.
Figure 5-12:
Press the soft keys corresponding with FM
4. Press the soft key under Src to select between internal source (Int) and external source
(Ext) for the modulating waveform (Figure 5-12). If internal source is selected:
a) Press the soft key under Shape to select the modulating waveform. If arbitrary
waveform (Arb) is chosen, the instrument will use the currently selected arbitrary
waveform. Press the Mod key to see which arbitrary modulating waveform is
currently selected.
b) Press the soft key under FM / 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.
5. Press the soft key under Freq / Dev (Figure 5-12). 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 frequency modulation from a remote interface:
FUNCtion {SINusoid|SQUare|RAMP|USER}
FREQuency {<frequency>|MINimum|MAXimum}
VOLTage {<amplitude>|MINimum|MAXimum}
VOLTage:OFFSet {<offset>|MINimum|MAXimum}
FM:INTernal:FUNCtion {SINusoid|SQUare|RAMP|NRAMp|TRIangle|NOISe|USER}
FM:INTernal:FREQuency {<frequency>|MINimum|MAXimum}
FM:DEViation {<peak deviation in Hz>|MINimum|MAXimum }
FM:SOURce {INTernal|EXTernal}
FM:STATe {OFF|ON}
Phase modulation
Phase modulation allows the phase of the carrier waveform to vary with the modulating waveform.
Carrier waveform
The default carrier waveform is sine. You can also choose square, ramp, and arbitrary waveforms.
The default carrier frequency is 1 kHz for all waveforms. Each carrier waveform has its own
acceptable range of frequencies. Refer to Table 4-1: Waveform function frequency ranges
for details.
Modulating waveform
The Model 3390 accepts either an internal or external modulating source.