Instructions

Chapter 2 Front Panel Operations RIGOL
DG2000 User Guide 2-53
Pulse Width Modulation (PWM)
For PWM (Pulse Width Modulation), the pulse width of the carrier waveform varies
with the instantaneous voltage of the modulating waveform.
To Select PWM Modulation
PWM can only be used to modulate pulse. To select PWM modulation, first select
Pulse, when the Shift key is illuminated, press Home/Menu  Modulation 
"PWM" to enable PWM function. Tap the icon at the upper-right corner of the
interface to view and set the parameters of the current carrier waveform. Tap the
icon
at the upper-right corner of the interface again to go back to the current
modulation parameter interface.
 If the "Pulse" waveform is not selected, PWM modulation is unavailable.
 When Modulation is enabled but the modulation type is not PWM, pressing
"Pulse" will select PWM automatically.
 When Modulation is enabled, Sweep or Burst will be automatically disabled
(if enabled currently).
To Select the Carrier Waveform
As mentioned before, the carrier waveform of PWM can only be Pulse. To select Pulse
waveform, when the Shift key is illuminated, press Home/Menu  Continuous
to select the desired carrier waveform. Also, when the Shift key is not illuminated,
you can directly press the Pulse/Utility key on the front panel to select the Pulse
waveform.
To Set Carrier Waveform Parameters
The different settings of various parameters (e.g. frequency, amplitude, offset, pulse
width, and duty cycle) of the Pulse waveform will affect the output PWM modulated
waveform. For all the pulses, the ranges of the various parameters are different. The
default values are 1 kHz frequency, 5 Vpp amplitude, 0 Vdc offset, 500 µs pulse width,
and 50% duty cycle.
Please refer to descriptions in "To Output Basic Waveform" to set the parameters
of the carrier waveform.