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When performing RMS or vector averaging, you can weight each new spectral record using either linear or exponential weighting.
Linear weighting combines N spectral records with equal weighting. When the number of averages is completed, the analyzer stops averaging and presents the averaged results.
Exponential weighting emphasizes new spectral data more than old and is a continuous process.
Weighting is applied according to the following equation.
where Xi is the result of the analysis performed on the ith block, Yi is the result of the averaging process from X1 to Xi, N = i for linear weighting, and N is a constant for exponential weighting (N = 1 for i = 1).