B&K Precision 2552-2559 - Programming Manual - Manual (Page 52)

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DESCRIPTION The FFT_WINDOW command selects the
window of FFT(Fast Fourier Transform
algorithm).
The response to the FFT_WINDOW? query
indicates current window of FFT
COMMAND SYNTAX
FFT_WINDOW
< window > : = {RECT,BLAC,HANN,HAMM}
RECT is short for rectangle.
BLAC is short for Blackman.
HANN is short for hanning.
HAMM is short for hamming,
QUERY SYNTAX
FFT_WINDOW？
RESPONSE FORMAT
FFT_WINDOW,
EXAMPLE The following command sets the FFT window
to hamming:
Command message:
FFTW HAMM
FUNCTION FFT_WINDOW, FFTW
Command /Query