RIGOL
DG900 Programming Guide
2-97
Remarks
This command is only applicable to the internal modulation source. The ASK modulation rate refers to
the frequency at which the output amplitude "shifts" between the carrier amplitude and modulation
amplitude.
When [:SOURce[<n>]] or [<n>] is omitted, the system sets the related parameters of CH1 by default.
Return Format
The query returns the ASK modulation rate in scientific notation, with 7 effective digits. For example,
1.02 (the AM modulation rate is 150 Hz).
Example
:SOUR1:ASK:INT 150 /*Sets the ASK modulation rate of CH1 to 150 Hz.*/
:SOUR1:ASK:INT? /*Queries the ASK modulation rate of CH1 and the query returns
1.02.*/
[:SOURce[<n>]][:MOD]:ASKey:POLarity
Syntax
[:SOURce[<n>]][:MOD]:ASKey:POLarity {POSitive|NEGative}
[:SOURce[<n>]][:MOD]:ASKey:POLarity?
Description
Sets the ASK modulation polarity of the specified channel to Positive (POSitive) or Negative (NEGative).
Queries the ASK modulation polarity of the specified channel.
Parameter
Name
Type
Range
Default
[<n>]
Discrete
1|2
1
{POSitive|NEGative}
Discrete
POSitive|NEGative
POSitive
Remarks
When [:SOURce[<n>]] or [<n>] is omitted, the system sets the related parameters of CH1 by default.
In the internal modulation (
[:SOURce[<n>]][:MOD]:ASKey:SOURce
), set the polarity to "Positive",
and the generator will output an amplitude whichever is smaller between the carrier amplitude and
modulating amplitude (
[:SOURce[<n>]][:MOD]:ASKey:AMPLitude
) when the modulating waveform is
a logic low level. It will output an amplitude whichever is greater between the carrier amplitude and
modulating amplitude when the modulating waveform is a logic high level. The situation is the
opposite when the polarity is set to "Negative".
In the external modulation (
[:SOURce[<n>]][:MOD]:ASKey:SOURce
), set the polarity to "Positive",
and the generator will output an amplitude whichever is smaller between the carrier amplitude and
modulating amplitude (
[:SOURce[<n>]][:MOD]:ASKey:AMPLitude
) when the external input signal is a
logic low level. It will output an amplitude whichever is greater between the carrier amplitude and the
modulating amplitude 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:ASK:POL POS /*Sets the ASK modulation polarity of CH1 to Positive.*/
:SOUR1:ASK:POL? /*Queries the ASK modulation polarity of CH1 and the query returns POS.*/
Summary of Contents for DG952
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