LeCroy 9300C Series, Operator'S Manual

Page: 99 / 275

10 –14
Zoom, Mathematics and Math Setup
SETUP — FFT
‡
— used to display the Fast Fourier Transform (FFT) of a signal and
visualize it in the frequency domain.
See the final section of this
chapter, and Appendix C, for when and how to use FFT.
use Math?
To choose a math function.
Math Type
For selecting “ FFT ”.
FFT result
To select the FFT’s output format: “ Imaginary ”, “ Magnitude ”,
“ Phase ”, “ Power Dens ”-ity, “ Power Spect ”-rum, “ Real ” or “ Real +
Imag ”.
with window
Using the corresponding menu button to select the FFT window type
from “
Rectangular ”, “ Hanning ”, “ Hamming ”, “ Blackman-Harris ”,
and “ Flat-top ”. And the associated knob to select “ AC ” or “ DC ”.
of
For selecting the source trace ( four-channel menu shown ).
‡
Only with WP02 Spectral Analysis package. See “Signal
Analysis” in Appendix A for specifications.
Note:
During Fast Fourier Transform computation the FFT
sign is displayed in the lower right-hand corner of the
screen. The computation of FFT on long time-domain
records can take time. The computation can be interrupted
or aborted at any time using any front-panel control.