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Digital Oscilloscope Series
95
MATH
FFT_WINDOW | FFTW
Command /Query
DESCRIPTION
The FFT_WINDOW command allows the
selection of five different windowing transforms
or operations for the FFT (Fast Fourier
Transform) function. Each window is useful for
certain classes of input signals.
The FFT_WINDOW? query returns the current
window of FFT.
COMMAND SYNTAX
FFT_WINDOW <window>
<window>:={RECT,BLAC,HANN,HAMM,FL
ATTOP}
• RECT — Rectangle is useful for transient
signals, and signals where there are an integral
number of cycles in the time record.
• BLAC — Blackman reduces time resolution
compared to the rectangular window, but it
improves the capacity to detect smaller impulses
due to lower secondary lobes (provides minimal
spectral leakage).
• HANN — Hanning is useful for frequency
resolution and general purpose use. It is good for
resolving two frequencies that are close together,
or for making frequency measurements.
• HAMM — Hamming.
• FLAT — Flattop is the best for making
accurate amplitude measurements of frequency
peaks.
QUERY SYNTAX
FFT_WINDOW?
RESPONSE FORMAT
FFT_WINDOW <window>
EXAMPLE
When the Math function is on, and the operator
is FFT, the following command sets the FFT
window to Hamming.
Command message:
FFTW HAMM
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