
USER’S MANUAL.
OD-405/410B/411/415
11-2011 Page
46
FFT RMS
Performs a FFT RMS calculation on a signal.
RMS is similar to FFT, however the amplitude is
calculated as RMS and not dB. Four types of
FFT windows are available: Hanning, Flattop,
Rectangular, and Blackman.
OD-411/OD-4145
only
.
Hanning FFT
Window Frequency
Resolution
Good
Amplitude
resolution
Not good
Suitable for....
Frequency measurement on
periodic waveforms.
Flattop FFT
Window Frequency
Resolution
Not Good
Amplitude
resolution
Good
Suitable for....
Amplitude measurement on
periodic waveforms.
Rectangular FFT
Window Frequency
Resolution
Very Good
Amplitude
resolution
Bad
Suitable for....
Single-shot phenomenon
(this mode is the same as
having no window at all).
Blackman FFT
Window Frequency
Resolution
Bad
Amplitude
resolution
Very Good
Suitable for....
Amplitude measurement on
periodic waveforms.
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