Chapter 2 Front Panel Operations RIGOL
DG1000Z User’s Guide 2-35
Modulation
DG1000Z can output modulated waveform from a single channel or from two
channels at the same time. Modulation is the process of modifying certain
parameters (such as amplitude, frequency, phase and etc.) of the carrier waveform
signal according to the change of the modulating signal. The carrier waveform can be
Sine, Square, Ramp, Arbitrary waveform (except DC) or Pulse (only in PWM). The
modulating waveform can be from internal or external modulation source. DG1000Z
supports 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
Press Mod Type AM to enable AM function. When Mod is enabled, Sweep or
Burst will be disabled automatically (if enabled currently).
To Select Carrier Waveform Shape
AM carrier waveform could be Sine, Square, Ramp or Arbitrary waveform (except
DC). The default is Sine.
Press the front panel key Sine, Square, Ramp or Arb (you need to press
Select Wform in the arbitrary waveform setting interface to select the desired
arbitrary waveform) to select the desired carrier waveform shape.
Pulse, Noise and DC could not be used as carrier waveform.
To Set Carrier Waveform Parameters
The different settings of various parameters (frequency, amplitude, DC offset, start
phase and etc.) of the carrier waveform will influence the AM modulated waveform.
For different carrier waveform shape, the ranges of the various parameters are
different (the ranges are related to the model of the instrument used and the carrier
waveform currently selected. See “Specifications” for details). For all carrier
waveform shapes, the default values are 1kHz frequency, 5Vpp amplitude, 0V
DC
offset and 0° start phase.
When the carrier waveform currently selected is Sine, Square or Ramp, please
refer to the introduction in “To Output Basic Waveform” to set the
parameters of the carrier waveform currently selected.
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