Instructions

Chapter 2 Command System RIGOL
DG2000 Programming Guide 2-113
set to "Negative".
 In the external modulation (
[:SOURce[<n>]][:MOD]:PSKey:SOURce), set the polarity to "Positive",
and the generator will output the carrier phase when the external input signal is a logic low level. It will
output the modulating phase (
[:SOURce[<n>]][:MOD]:PSKey:PHASe) when the external input signal
is a logic high level. The situation is the opposite when the polarity is set to "Negative".
Return Format
The query returns POS or NEG.
Example
:SOUR1:PSK:POL POS /*Sets the PSK modulation polarity of CH1 to Positive.*/
:SOUR1:PSK:POL? /*Queries the PSK modulation polarity of CH1 and the query returns POS.*/
[:SOURce[<n>]][:MOD]:PSKey:SOURce
Syntax
[:SOURce[<n>]][:MOD]:PSKey:SOURce {INTernal|EXTernal}
[:SOURce[<n>]][:MOD]:PSKey:SOURce?
Description
Sets the PSK modulation source of the specified channel to internal (INTernal) or external (EXTernal)
modulation source.
Queries the PSK modulation source of the specified channel.
Parameter
Name
Type
Range
Default
[<n>]
Discrete
1|2
1
{INTernal|EXTernal}
Discrete
INTernal|EXTernal
INTernal
Remarks
 DG2000 can receive modulating waveform from the internal or external modulation source.
 When the internal source is selected, the modulating waveform is set as a Square with 50% duty cycle.
At this time, the rate at which the output phase "shifts" between "carrier phase" and "modulating
phase" (
[:SOURce[<n>]][:MOD]:PSKey:PHASe) is determined by the modulation rate
(
[:SOURce[<n>]][:MOD]:PSKey:INTernal:RATE).
 When the external source is selected, the generator receives the external modulating signal from the
rear-panel [Sync/Ext Mod/Trig/FSK] connector. For the connector, controlling PSK modulation
externally is different from controlling AM/FM/PM modulations externally. While controlling the PSK
modulation, you can set the polarity (
[:SOURce[<n>]][:MOD]:PSKey:POLarity).
 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:PSK:SOUR EXT /*Sets the PSK modulation source of CH1 to external modulation source.*/
:SOUR1:PSK:SOUR? /*Queries the PSK modulation source of CH1 and the query returns EXT.*/