Instructions
RIGOL Chapter 2 Front Panel Operations
2-34 DG2000 User Guide
Modulation
DG2000 can output modulated waveforms from a single channel or from dual
channels at the same time. Modulation is the process of modifying certain
parameters (e.g. amplitude, frequency, or phase) of the carrier waveform signal
according to the changes of the modulating signal. The carrier waveform can be Sine,
Square, Ramp, Arbitrary waveform, or Pulse (only in PWM). The modulating
waveform can be from internal or external modulation source. The modulation types
supported by DG2000 include AM, FM, PM, ASK, FSK, PSK, and PWM.
Amplitude Modulation (AM)
For amplitude modulation (AM), the amplitude of the carrier waveform varies with
the instantaneous voltage of the modulating waveform.
To Select AM Modulation
When the Shift key is illuminated, press Home/Menu Modulation "AM" to
enable the AM function. When Modulation is enabled, Sweep or Burst will be
automatically disabled (if enabled currently). Tap the icon
at the upper-right
corner of the interface (when Sine is selected as the carrier waveform) 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.
To Select the Carrier Waveform
AM carrier waveform could be Sine, Square, Ramp, or Arbitrary waveform. The
default is Sine.
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 corresponding waveform function key on the front
panel to select the desired carrier waveform.
Pulse, Noise, Harmonic, Dual-tone, and DC could not be used as carrier
waveform.
To Set Carrier Waveform Parameters
The different settings of various parameters (e.g. frequency, amplitude, offset, and
start phase) of the carrier waveform will affect the output AM modulated waveform.
For different carrier waveform shapes, the ranges of the various parameters are