User manual

Chapter 2 Command System RIGOL
DG800 Programming Guide 2-105
 When [:SOURce[<n>]] or [<n>] 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 /*Sets the FM modulation source of CH1 to external modulation source.*/
:SOUR1:FM:SOUR? /*Queries the FM modulation source of CH1 and the query returns EXT.*/
[:SOURce[<n>]][:MOD]:FM:STATe
Syntax
[:SOURce[<n>]][:MOD]:FM:STATe {ON|1|OFF|0}
[:SOURce[<n>]][:MOD]:FM:STATe?
Description
Enables or disables the FM modulation function of the specified channel.
Queries the on/off status of the FM modulation function of the specified channel.
Parameter
Name
Type
Range
Default
[<n>]
Discrete
1|2
1
{ON|1|OFF|0}
Bool
ON|1|OFF|0
OFF
Remarks
 FM (Frequency Modulation): the frequency of the carrier waveform changes with the transient voltage
of the modulating waveform.
 The FM carrier waveform can be Sine, Square, Ramp, or Arbitrary waveform. The default is Sine. Pulse,
Noise, and DC cannot be used as carrier waveform. The different settings of various parameters (e.g.
frequency, amplitude, offset, and start phase) of the carrier waveform will affect the output FM
modulated waveform.
 When [:SOURce[<n>]] or [<n>] is omitted, the system sets the related parameters of CH1 by default.
 If the sweep function (
[:SOURce[<n>]]:SWEep:STATe) or burst function
(
[:SOURce[<n>]]:BURSt[:STATe]) is currently enabled, it will be disabled automatically when the
modulation function is enabled.
 If the harmonic function is currently enabled (
[:SOURce[<n>]]:HARMonic[:STATe]), the modulation
function cannot be enabled (i.g. the harmonic cannot be modulated).
Return Format
The query returns ON or OFF.
Example
:SOUR1:FM:STAT ON /*Enables the FM modulation function of CH1.*/
:SOUR1:FM:STAT? /*Queries the on/off status of the FM modulation function of CH1 and the query
returns ON.*/