RIGOL DG4000 Series - Manual (Page 104)

RIGOL Chapter 5 Modulated Waveform Output
DG4000 Series User’s Guide 5-4
To Set Modulating Waveform Frequency
When internal modulation source is selected, press AM_Freq to set the
modulating waveform frequency.
 Input the desired frequency value using the numeric keyboard or direction
keys and knob.
 The modulating waveform frequency ranges from 2mHz to 50kHz, and the
default value is 100Hz.
Notice that, this menu will be grayed out and disabled when external modulation
source is selected.
To Set Modulation Depth
Modulation depth expressed as a percentage indicates the amplitude variation
degree. The AM modulation depth ranges from 0% to 120%. Press AM Depth to
set AM modulation depth.
 In 0% modulation, the output amplitude is half of the specified value.
 In 100% modulation, the output amplitude is equal to the specified value.
 In >100% modulation, the output amplitude of the instrument would not
exceed 10Vpp (50Ω load).
When “Ext” modulation source is selected, the output amplitude of the instrument
is also controlled by the ±2.5V signal level at the [Mod/FSK/Trig] connector at
the rear panel. For example, set the modulation depth to 100%, the output
amplitude is the maximum when the modulating signal is +2.5V and the minimum
when the modulating signal is -2.5V.