:SOURce:SSC:STATe

Command Syntax

:SOURceN:SSC:STATe {ON | OFF | 1 | 0}

Where N identifies a simulated instrument's specific channel in the form "<connection1-8>_<ch1-8>" (for example, SOURce4_2). With connection 1, the connection number part (that is, "1_") is optional, and you can simply use the channel number "<ch1-8>" (for example, SOURce3 which is the same as SOURce1_3).

Query Syntax

:SOURceN:SSC:STATe?

Query Response

{1 | 0}

Description

With a simulated signal source using the CLOCk or DATA waveform types (see :SOURce:WTYPe), the :SOURce:SSC:STATe command enables or disables the Spread Spectrum Clocking (SSC) option for the source.

The Spread Spectrum Clocking option lets you modulate the symbol rate of a simulated signal.

Spread Spectrum Clocking (SSC) is used to reduce the peak electromagnetic radiation at the nominal clock frequency. With SSC, the clock pulse is modulated with a relatively low-frequency waveform that has a specified pattern/shape. SSC broadens a clock or data signal spectrum and reduces its peak energy.

Use the :SOURce:SSC:FREQuency command to specify the frequency of the modulating signal.

Use the :SOURce:SSC:PHASe command to specify the phase of the modulating signal.

Use the :SOURce:SSC:PERCent command to specify the magnitude of the symbol rate change (spread) as a percent.

Use the :SOURce:SSC:PPM command to specify the magnitude of the symbol rate change (spread) as a parts-per-million value.

Use the :SOURce:SSC:PATTern command to specify the shape of the modulating signal.

Use the :SOURce:SSC:STYPe command to specify how the symbol rate is spread to different frequencies and back.

Example Command Sequence

:SOURce1:SSC:STATe ON
:SOURce1:SSC:FREQuency 33.0E+3
:SOURce1:SSC:PHASe 0.0
:SOURce1:SSC:PERCent 0.5
:SOURce1:SSC:PPM 5.0E+3
:SOURce1:SSC:PATTern TRIangle
:SOURce1:SSC:STYPe DSPRead