RIGOL DG1000Z Series - Manual (Page 141)

Chapter 2 Command System RIGOL
DG1000Z Programming Guide 2-129
[:SOURce[]][:MOD]:FM:SOURce
Syntax [:SOURce[]][:MOD]:FM:SOURce {INTernal|EXTernal}
[:SOURce[]][:MOD]:FM:SOURce?
Description Set the FM modulation source of the specified channel to internal (INTernal) or
external (EXTernal) modulation source.
Query the FM modulation source of the specified channel.
Parameter Name Type Range Default
[] Discrete 1|2 1
{INTernal|EXTernal} Discrete INTernal|EXTernal INTernal
Explanation  DG1000Z can receive the modulation waveform from the internal or external
modulation source.
 When internal modulation source is selected, the modulation waveform can be
SINusoid, SQUare, TRIangle, RAMP, NRAMp, NOISe or USER and the default is
SINusoid. NOISe can be used as modulation waveform but cannot be used as
carrier waveform.
 When external modulation source is selected, the signal generator receives the
external modulating signal from the [Mod/Trig/FSK/Sync] connector of the
corresponding channel at the rear panel. At this point, the frequency deviation
of the modulated waveform is controlled by the ±5 V signal level of the
connector. For example, if the frequency deviation is set to 1kHz, +5V signal
level corresponds to a 1kHz increase of frequency and -5V signal level
corresponds to a 1kHz decrease of frequency.
 When [:SOURce[]] or [] is omitted, the system sets the related
parameters of CH1 by default.
Return Format The query returns INT or EXT.
Example :SOUR1:FM:SOUR EXT /*Set the FM modulation source of CH1 to external
modulation source*/
:SOUR1:FM:SOUR? /*Query the FM modulation source of CH1 and the
query returns EXT*/