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corresponding multipurpose knob to set the value. Its range is from 2 mHz to the
current carrier frequency.
TIP
The frequency deviation plus the carrier frequency must be less than or equal to the selected
carrier's maximum frequency.
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.
14.2.3 PM
Phase Modulation (PM), namely the phase 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 "PM".
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 Phase Deviation
Phase deviation represents the peak variation in phase of the modulated waveform
from the carrier waveform. Click or tap the
Phase Dev input field to set the phase
deviation with the pop-up numeric keypad. You can also use the corresponding
multipurpose knob to set the value. Its available range is from 0° to 360°, and the
default is 90°.
Function/Arbitrary Waveform Generator (for
DHO914S and DHO924S only)
DHO900 User Guide
176
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
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