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Chapter 9 MATH and Reference
269
Hanning window
This is the best window type for measuring amplitude accuracy but less effective for resolving frequencies.
Use Hanning to measure sinusoidal, periodic, and narrowband random noises. This window is used for
measuring transients or bursts of signal levels before or after events with significant differences.
Blackman-Harris window
This is the best window type for measuring frequency amplitude, but worst for measuring the resolution
frequency.
Use the Blackman-Harris measurement to find the main single-signal frequency waveform for higher
harmonics.
Since the oscilloscope performs FFT transform on the finite-length time record, the FFT algorithm assumes
that YT waveform is continuously repeated. Thus, when the period is integral, the amplitudes of YT
waveform at the beginning and at the end are the same, and waveform will not interrupt. However, if the
period of YT waveform is not integral, the waveform amplitudes at the beginning and at the end are
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