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RIGOL
To Select Modulation Source
Tap the Source parameter selection field to select an "Internal" or "External"
modulation source.
1. Internal Source
When internal modulation source is selected, tap the Mod.Wave parameter
selection field to select Sine, Square, Triangle, UpRamp, DnRamp, Noise, or Arb
as modulating waveform. By default, Sine is selected.
Square: 50% duty cycle.
⚫
Triangle: 50% symmetry.
⚫
UpRamp: 100% symmetry.
⚫
DnRamp: 0% symmetry.
⚫
Arb: the arbitrary waveform selected for the current channel.
⚫
Note:
Noise can be used as the modulating waveform but cannot be used as
carrier waveform.
2. External Source
When the external modulation source is selected, Mod.Wave and Mod.Freq
will be grayed out and disabled. The generator receives the external modulating
signal from the rear-panel [CH1/Sync/Ext Mod/Trig/FSK] connector. At this
time, the width deviation or the duty cycle deviation of the modulated waveform
is controlled by the ± 5 V signal level on the connector. For example, if the width
deviation is set to 10 s, the +5 V signal level corresponds to a 10 s width
variation.
To Set Modulating Waveform Frequency
When the internal modulation source is selected, tap the Mod.Freq parameter input
field and use the numeric keypad to set the modulating waveform frequency.
You can also use the arrow keys and the knob to input a desired frequency
⚫
value.
The modulating waveform frequency ranges from 2 mHz to 1 MHz, and the
⚫
default value is 100 Hz.
Note:
When the external modulation source is selected, this menu will be grayed out
and disabled.
2-54
Chapter 2 Front Panel Operations
DG2000 User Guide
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