472 Chapter7
Language Reference
FFT Fast Fourier Transform
FFT Fast Fourier Transform
Syntax
Figure 7-115 FFT Syntax
Description
The FFT command performs a discrete Fourier transform on the source
trace array and stores the logarithms of the magnitudes of the results
in the destination array. The maximum length of any of the traces is
601 points.
FFT is designed to be used in transforming zero-span
amplitude-modulation information into the frequency domain.
Performing an FFT on a frequency sweep will not provide time-domain
results and is not recommended.
The FFT results are displayed on the spectrum analyzer in a
logarithmic amplitude scale. For the horizontal dimension, the
frequency at the left side of the graticule is 0 Hz, and at the right side is
F
max
. F
max
is equal to 300 divided by sweep time.
As an example, if the sweep time of the analyzer is 60 ms, F
max
equals 5
kHz.
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