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Modulation
Modulation Source
The instrument accepts an internal or external signal as the modulation source. Click
or tap the Source drop-down button to select "Internal" or "External".
•
Internal Source
After "Internal" is selected, you can click or tap the Shape drop-down button to
select the modulating waveform shape. Available shapes include:
-
-
-
-
-
-
-
•
External Source
After "External" is selected, Shape and PWM Freq are grayed out and disabled.
The instrument accepts an external modulation source applied to the rear-panel
[AUX IN/OUT] connector. At this time, the amplitude of the modulated
waveform is controlled by the ±5 V signal level present on the connector.
Modulation Frequency
After the internal modulation source is selected, click or tap the PWM Freq input field
and set the modulation frequency with the pop-up numeric keypad. The available
range is from 2 mHz to 1 MHz, and the default is 100 Hz.
TIP
When an external modulation source is selected, this setting is disabled.
Width/Duty Cycle Deviation
PWM deviation represents the variation of the modulated waveform pulse width
relative to the original pulse width. You can use time (width deviation) or duty cycle
(duty cycle deviation) to set the PWM deviation. This setting is subject to the
Width/Duty Cycle
Pulse Width/Duty Cycle
for
automatically set to "Width Dev".
•
Width Deviation
DG900 Pro User Guide
58
Sine
Square with 50% duty cycle
Triangle with 50% symmetry
UpRamp with 100% symmetry
DnRamp with 0% symmetry
Noise - white gaussian noise
Arb - standard arbitrary waveform other than DC
setting in Carrier (Pulse) setting. For example, if "Width" is selected
of the Pulse setting, then the PWM deviation setting is
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
Pulse
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