# :PNOise Subsystem

:PNOise Commands

- :PNOise Subsystem
- :PNOise:ANNotations
- :PNOise:CLOCk:EDGE
- :PNOise:COFRequency?
- :PNOise:CORRelations
- :PNOise:DATA:ASCii:XDATa?
- :PNOise:DATA:ASCii:YDATa?
- :PNOise:DATA:AVERages?
- :PNOise:DATA:CFRequency?
- :PNOise:DATA:CORRelations?
- :PNOise:DATA:DOUBle:XDATa?
- :PNOise:DATA:DOUBle:YDATa?
- :PNOise:DATA:FLOat:XDATa?
- :PNOise:DATA:FLOat:YDATa?
- :PNOise:DATA:POINts?
- :PNOise:DATA:STATus?
- :PNOise:DATA:STYPe?
- :PNOise:DISPlay
- :PNOise:MARKer:LIMit
- :PNOise:MARKer:MARKer:MAGNitude?
- :PNOise:MARKer:MARKer:XPOSition
- :PNOise:MARKer:STATe
- :PNOise:PJITter?
- :PNOise:PJITter:STARt
- :PNOise:PJITter:STATe
- :PNOise:PJITter:STOP
- :PNOise:PJITter:UNITs
- :PNOise:RSSClock
- :PNOise:SOURce:ONE
- :PNOise:SOURce:TWO
- :PNOise:SOURce:TWO:ENABled
- :PNOise:SPUR:PROCessing
- :PNOise:SPUR:SENSitivity
- :PNOise:TRANge?
- :PNOise:WINDow
- :PNOise:X:STARt
- :PNOise:X:STOP
- :PNOise:Y:OFFSet
- :PNOise:Y:SCALe

The Phase Noise analysis feature measures phase noise in a clock source. It can use the two-channel cross-correlation technique that lowers the oscilloscope's phase noise measurement floor by splitting the clock source signal into two oscilloscope input channels.

As the oscilloscope runs, continuing to make acquisitions, a specified number of cross-correlations are performed to reduce noise. After the specified number of cross-correlations are performed, measurement results are averaged to smooth the roughness of the phase noise plot.

Phase noise measurement results are presented in a log frequency plot where the amplitude units are dBc/Hz (decibels relative to the carrier power normalized to a 1 Hz bandwidth). The X-axis is the single-sideband (SSB) frequency offset from the nominal signal or "carrier" frequency.