User manual

RIGOL Chapter 5 Modulated Waveform Output
DG4000 User's Guide
5-8
To Set the Modulating Waveform Frequency
When internal modulation source is selected, press FM_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.
Note: This menu will be grayed out and disabled when external modulation source
is selected.
To Set the Frequency Deviation
Frequency deviation is the deviation of the modulating waveform frequency
relative to the carrier frequency. Press Deviation to set the FM frequency
deviation.
 Frequency deviation must be lower than or equal to the carrier frequency.
 The sum of frequency deviation and carrier frequency must be lower than or
equal to the sum of the current carrier frequency upper limit and 1kHz.
When "Ext" modulation source is selected, frequency deviation is controlled by the
±2.5V signal level at the [Mod/FSK/Trig] connector at the rear panel. Positive
signal level corresponds to frequency increase and negative signal level
corresponds to frequency decrease. The lower the level, the less offset is
generated. For example, if the frequency deviation is set to 1kHz, +2.5V signal
level corresponds to a 1kHz increase of frequency and -2.5V signal level
corresponds to a 1kHz decrease of frequency.