Windowing
Use a windowing function to reduce leakage if your signal is not periodic
within the time record. (Leakage is the effect of smearing or leaking energy
into adjacent frequency lines which results in distorting the spectra.) The
effect of leakage underestimates the amplitude of the spectra and overestimates
the damping factor.
A windowing function artificially forces the signal to 0 at the beginning and at
the end of the time record. The signal then appears to be periodic. A
windowing function does not eliminate leakage completely and may distort the
results by eliminating some of the data. If possible, another technique is to use
a signal that is periodic within the time record, such as burst random or
periodic chirp. Such signals eliminate the leakage problem.
Agilent 35670A
Operator's Guide Measuring Structures
2-7
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