Math FFT
The Math FFT function includes three FFT Window options. There is a trade-off
between frequency resolution and amplitude accuracy with each type of window.
What you want to measure and your source signal characteristics will help you to
determine which window to use.
Window
Measure
Characteristics
Hanning
Periodic waveforms
Better frequency, poorer magnitude
accuracy than Flattop.
Flattop
Periodic waveforms
Better magnitude, poorer frequency
accuracy than Hanning.
Rectangular
Pulses or transients
Special-purpose window for waveforms
that do not have discontinuities. This is
essentially the same as no window.
FFT Aliasing
Problems occur when the oscilloscope acquires a time-domain waveform
containing frequency components that are greater than the Nyquist frequency.
(See page 63,
.) The frequency components that are above the
Nyquist frequency are undersampled, appearing as lower frequency components
that "fold back" around the Nyquist frequency. These incorrect components are
called aliases.
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TPS2000B Series Digital Oscilloscope User Manual
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Страница 26: ...Preface xviii TPS2000B Series Digital Oscilloscope User Manual...
Страница 40: ...Getting Started 14 TPS2000B Series Digital Oscilloscope User Manual...
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Страница 170: ...Appendix D Cleaning 144 TPS2000B Series Digital Oscilloscope User Manual...
Страница 184: ...Index Z Zoom 58 FFT 68 Horiz menu 104 Window Zone 104 105 158 TPS2000B Series Digital Oscilloscope User Manual...