The optimization of data in analytical chemistry is a problem encountered in many research laboratories. Several authors have worked out theoretical and experimental methods for enhancement and for measurement of signal/noise ratio (S/N). Recently, Wehrly <i>et al.</i> described an electronic circuit to increase the S/N by digitally averaging data. The purpose of the present paper is to explain how one can achieve the same result in a much simpler and less expensive way by using a low-pass filter. Discussions will be limited to the instruments whose data are obtained in the form of recorded spectra from dc signals.

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