Agilent Technologies Infiniium 8000A Programmer's Reference Manual page 360

Command
<N> An integer, 1 - 4, representing the selected function.
<source> {CHANnel<n> | FUNCtion<n> | WMEMory<n> | <float_value>}
Example
Function Commands
FFTPhase
FFTPhase
:FUNCtion<N>:FFTPhase <source>
The :FUNCtion<N>:FFTPhase command computes the Fast Fourier Transform
(FFT) of the specified channel, function, or waveform memory. The FFT takes
the digitized time record and transforms it into magnitude and phase
components as a function of frequency.
CHANnel<n> is:
An integer, 1 - 2, for two channel Infiniium Oscilloscopes.
An integer, 1 - 4, for all other Infiniium Oscilloscope models.
FUNCtion<n> and WMEMory<n> are:
An integer, 1 - 4, representing the selected function or waveform memory.
<float_value> is:
A real number from -1E6 to 1E6.
This example sets up function 1 to compute the FFT of waveform memory 3.
10 OUTPUT 707;":FUNCTION1:FFTPHASE WMEMORY3"
20 END
Functions Used as Operands
A function may be used as a source for another function, subject to the following
constraints:
F4 can have F1, F2, or F3 as a source.
F3 can have F1 or F2 as a source.
F2 can have F1 as a source.
F1 cannot have any other function as a source.
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