# :FUNCtion:PARameters:FFT:PREFerence

FFT Parameters Commands

- :FUNCtion:PARameters:FFT:AIMPedance
- :FUNCtion:PARameters:FFT:DETector:COUNt
- :FUNCtion:PARameters:FFT:DETector:TYPE
- :FUNCtion:PARameters:FFT:DISPlay
- :FUNCtion:PARameters:FFT:NFRequency
- :FUNCtion:PARameters:FFT:PEAK:ASCii:FDATa?
- :FUNCtion:PARameters:FFT:PEAK:ASCii:MDATa?
- :FUNCtion:PARameters:FFT:PEAK:COUNt
- :FUNCtion:PARameters:FFT:PEAK:DOUBle:FDATa?
- :FUNCtion:PARameters:FFT:PEAK:DOUBle:MDATa?
- :FUNCtion:PARameters:FFT:PEAK:ENABle
- :FUNCtion:PARameters:FFT:PEAK:LEVel
- :FUNCtion:PARameters:FFT:PEAK:SORT
- :FUNCtion:PARameters:FFT:PREFerence
- :FUNCtion:PARameters:FFT:PREFerence:TORigin
- :FUNCtion:PARameters:FFT:RBANdwidth?
- :FUNCtion:PARameters:FFT:RIMPedance
- :FUNCtion:PARameters:FFT:TFACtor
- :FUNCtion:PARameters:FFT:WINDow

## Command Syntax

    :FUNCtion:PARameters:FFT:PREFerence {LEFT | CENTer | MANual}

## Query Syntax

    :FUNCtion:PARameters:FFT:PREFerence?

## Description

When the FFT output has been defined as phase, unwrapped phase, or group delay (`:FUNCtion:PARameters:FFT:DISPlay` command), use this command to set the FFT phase reference to `LEFT`, `CENTer`, or `MANual`. When `MANual` is specified, use the `:FUNCtion:PARameters:FFT:PREFerence:TORigin` command to set the FFT origin in seconds.

## Child Commands

- `:FUNCtion:PARameters:FFT:PREFerence:TORigin`