# :FUNCtion:PARameters:FFT:RBANdwidth?

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

## Query Syntax

    :FUNCtionN:PARameters:FFT:RBANdwidth?

Where N identifies one of up to 64 possible operators {1:64} that can be defined as part of a math function. The operators are numbered in the order that they were originally added to the function.

## Description

Returns the FFT's resolution bandwidth (RBW).

The FFT resolution, which is defined as sampling rate / memory depth when using the `RECTangular` window (see `:FUNCtion:PARameters:FFT:WINDow` — other windows have a Normalized Equivalent Noise Bandwidth factor applied). If the sample size is not a power of two number of points, the Infiniium application adds zeros equally to the beginning and end of the data until there is a power of two number of points.

You can adjust the resolution bandwidth by changing the memory depth and/or sampling rate acquisition setup options when they are in manual mode. See `:ACQuire:POINts` and `:ACQuire:SRATe`.