Rigol DG800 Series - Page 121

Chapter 2 Command System RIGOL
DG800 Programming Guide 2-107
Remarks
 This command is only applicable to the internal modulation source
(
[:SOURce[<n>]][:MOD]:FSKey:SOURce). The FSK modulation rate refers to the frequency at which
the output frequency "shifts" between the carrier frequency and the hop frequency
(
[:SOURce[<n>]][:MOD]:FSKey[:FREQuency]).
 When [:SOURce[<n>]] or [<n>] is omitted, the system sets the related parameters of CH1 by default.
Return Format
The query returns the FSK modulation rate in scientific notation, with 7 effective digits. For example,
1.500000E+02 (the FSK modulation rate is 150 Hz).
Example
:SOUR1:FSK:INT:RATE 150 /*Sets the FSK modulation rate of CH1 to 150 Hz.*/
:SOUR1:FSK:INT:RATE? /*Queries the FSK modulation rate of CH1 and the query returns
1.500000E+02.*/
[:SOURce[<n>]][:MOD]:FSKey:POLarity
Syntax
[:SOURce[<n>]][:MOD]:FSKey:POLarity {POSitive|NEGative}
[:SOURce[<n>]][:MOD]:FSKey:POLarity?
Description
Sets the FSK modulation polarity of the specified channel to Positive (POSitive) or Negative (NEGative).
Queries the FSK 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]:FSKey:SOURce), set the polarity to "Positive",
and the generator will output the carrier frequency when the modulating waveform amplitude is a logic
low level. It will output the hop frequency (
[:SOURce[<n>]][:MOD]:FSKey[:FREQuency]) when the
modulating waveform amplitude is a logic high level. The situation is the opposite when the polarity is
set to "Negative".
 In the external modulation (
[:SOURce[<n>]][:MOD]:FSKey:SOURce), set the polarity to "Positive",
and the generator will output the carrier frequency when the external input signal is a logic low level.
It will output the hop frequency (
[:SOURce[<n>]][:MOD]:FSKey[:FREQuency]) 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:FSK:POL POS /*Sets the FSK modulation polarity of CH1 to Positive.*/
:SOUR1:FSK:POL? /*Queries the FSK modulation polarity of CH1 and the query returns POS.*/