Rigol DHO900 Series User Manual page 191

You can also use the corresponding multipurpose knob to set the value. AM depth
ranges from 0% to 120%, and the default is 100%.
• At 0% depth, the amplitude is one-half of the carrier's amplitude setting.
• At 100% depth, the amplitude is identical to the carrier's amplitude setting.
• At greater than 100% depth, the instrument will not exceed 10 Vpp on the
output.
Set the Modulation Frequency
When the selected modulating waveform is not noise, you can set the modulation
frequency. Click or tap the Mod Freq input field to set the modulation frequency with
the pop-up numeric keypad. You can also use the corresponding multipurpose knob
to set the value. Its range is from 2 mHz to 1 MHz.
To Enable the Modulation Output
Click or tap Modulation on/off switch to enable the modulation function. In the
"Basic waves" setting menu, click or tap the Output on/off switch to enable the
waveform output. The instrument will output the modulated waveform via the rear-
panel [AFG OUT] connector according to the settings.
14.2.2 FM
Frequency Modulation (FM), namely the frequency of the carrier waveform changes
with the voltage of the modulating waveform.
Select the Modulation Type
Click or tap the Modulation Type drop-down button to select "FM".
Select the Modulating Waveform
The instrument uses built-in signals for modulation. Click or tap the Shape drop-
down button to select the modulating waveform. Available waveforms include:
• Sine
• Square with 50% duty cycle
• Triangle with 50% symmetry
• UpRamp with 100% symmetry
• DnRamp with 0% symmetry
• White gaussian noise
Set the Frequency Deviation
Frequency deviation represents the peak variation in frequency of the modulated
waveform from the carrier frequency. Click or tap the Deviation input field to set the
frequency deviation with the pop-up numeric keypad. You can also use the
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
Function/Arbitrary Waveform Generator (for
DHO914S and DHO924S only)
DHO900 User Guide
175