Rigol DG822 - Page 109

Chapter 2 Command System RIGOL
DG800 Programming Guide 2-95
[:SOURce[<n>]][:MOD]:AM[:DEPTh]
Syntax
[:SOURce[<n>]][:MOD]:AM[:DEPTh] {<depth>|MINimum|MAXimum}
[:SOURce[<n>]][:MOD]:AM[:DEPTh]? [MINimum|MAXimum]
Description
Sets the AM modulation depth of the specified channel.
Queries the AM modulation depth of the specified channel.
Parameter
Name
Type
Range
Default
[<n>]
Discrete
1|2
1
<depth>
Real
0% to 120%
100%
Remarks
 When [:SOURce[<n>]] or [<n>] is omitted, the system sets the related parameters of CH1 by default.
 Modulation depth indicates the amplitude variation. It is expressed in percentage. When the
modulation depth is 0%, the output amplitude is half of the amplitude of the carrier signal. At 100%
depth, the output amplitude is equal to carrier waveform amplitude. When the modulation depth is
greater than 100%, the output amplitude of the instrument will not exceed 10 Vpp (when the load is
50 Ω).
 When the external modulation source (
[:SOURce[<n>]][:MOD]:AM:SOURce) is selected, the output
amplitude of the instrument is controlled by the ±5 V signal level on the rear-panel [Sync/Ext
Mod/Trig/FSK] connector. For example, if the modulation depth is set to 100%, the output
amplitude will be the maximum when the modulating signal is +5 V and the minimum when the
modulating signal is -5 V.
Return Format
The query returns the AM modulation depth in scientific notation, with 7 effective digits. For example,
5.000000E+01 (the AM modulation depth is 50°).
Example
:SOUR1:AM 50 /*Sets the AM modulation depth of CH1 to 50%.*/
:SOUR1:AM? /*Queries the AM modulation depth of CH1 and the query returns 5.000000E+01.*/
[:SOURce[<n>]][:MOD]:AM:DSSC
Syntax
[:SOURce[<n>]][:MOD]:AM:DSSC {ON|1|OFF|0}
[:SOURce[<n>]][:MOD]:AM:DSSC?
Description
Enables or disables the AM carrier waveform suppression function of the specified channel.
Queries the on/off status of the AM carrier waveform suppression 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
 DG800 supports two types of amplitude modulation: normal amplitude modulation and double
sideband suppressed carrier (DSB-SC) amplitude modulation. In the normal amplitude modulation, the
modulated waveform contains carrier waveform components. Because carrier waveform components
carry no information, the modulation is less efficient. In order to improve the modulation efficiency,