User manual

5-10 Return to Section Topics 3390-900-01 Rev. C / January 2009
Section 5: Waveform Output Operations Model 3390 Arbitrary Waveform Generator User’s Manual
the amplitude of the output will reach Max Amplitude. When the external waveform is at -5 V, the
amplitude of the output will reach Min Amplitude.
The modulation output of the Model 3390 will not exceed ±5 V peak (into a 50 Ω load) even if the
modulation depth is greater than 100%.
To set up amplitude 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 AM to select amplitude
modulation (Figure 5-11). An amplitude modulation output will be generated with the set
parameters.
Figure 5-11:
Press the soft keys corresponding with AM
4. Press the soft key under Src to select between internal source (Int) and external source
(Ext) for the modulating waveform (Figure 5-11). 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 AM / 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 AM / Depth (Figure 5-11). 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 % 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 amplitude modulation from a remote interface:
FUNCtion {SINusoid|SQUare|RAMP|USER}
FREQuency {<frequency>|MINimum|MAXimum}
VOLTage {<amplitude>|MINimum|MAXimum}
VOLTage:OFFSet {<offset>|MINimum|MAXimum}
AM:INTernal:FUNCtion {SINusoid|SQUare|RAMP|NRAMp|TRIangle|NOISe|USER}
AM:INTernal:FREQuency {<frequency>|MINimum|MAXimum}
AM:DEPTh {<depth in percent> MINimum|MAXimum }
AM:SOURce {INTernal|EXTernal}
AM:STATe {OFF|ON}
Frequency modulation
Frequency modulation allows the frequency of the carrier waveform to vary with the modulating
waveform. Only one type of modulation can be active at one time. If frequency modulation is