Rigol DG800 Series, User Manual

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RIGOL Chapter 2 Front Panel Operations
2-40 DG800 User's Guide
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The frequency deviation must be smaller than or equal to the carrier frequency.

The sum of frequency deviation and carrier frequency must be smaller than or
equal to the the upper limit of the current carrier frequency plus 1 kHz.
Note:
If Sine is selected currently as the carrier waveform, the carrier amplitude will
be limited at 2 Vpp when the sum of the frequency deviation and the carrier
frequency is greater than the frequency upper limit of the current carrier.
When the external modulation source is selected, the frequency deviation is
controlled by the ±5 V signal level on the rear-panel [CH1/Sync/Ext
Mod/Trig/FSK] connector. Positive signal level corresponds to frequency increase,
and negative signal level corresponds to frequency decrease. Lower signal levels
produce less deviation. For example, if the frequency deviation is set to 1 kHz, +5 V
signal level corresponds to a 1 kHz increase in frequency and -5 V signal level
corresponds to a 1 kHz decrease in frequency.