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Chapter 7 Tutorial
Creating Arbitrary Waveforms
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Leakage error is caused when the waveform record does not include an
integral number of cycles of the fundamental frequency. Power from the
fundamental frequency, and its harmonics, is transferred to the spectral
components of the rectangular sampling function. You can reduce
leakage errors by adjusting the window length to include an integer
number of cycles or by including more cycles within the window to reduce
the residual end-point discontinuity size. Some signals are composed of
discrete, non-harmonically related frequencies. Since these signals are
non-repetitive, all frequency components cannot be harmonically related
to the window length. You should be careful in these situations to
minimize end-point discontinuities and spectral leakage.
Arbitrary Waveform with Discontinuity
Spectrum of Above Waveform at 100 kHz
1 Cycle
0°
90° 180° 270° 360°/0° 90°
180°
270° 360°
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