The examination of surface texture requires filtering for a number of reasons. An outliers removal filter could be required to clean up data obtained with an optical probe, whereas a morphological filter is frequently used to rectify the stylus tip effect on raw data. In some circumstances, a smoothing filter, like a s or S-Filter, is necessary to compare data obtained using various instrumentation techniques. However, the primary function of a filter is to distinguish between long and short-scale components, or waviness and roughness, and to calculate parameters in accordance with the specification.

The profile that contemporary profilometers measure is known as the Extracted profile. It is a digitized and sampled abstraction of the actual surface (several filtering effects are introduced by the probe and the bandwidth of the instrument). When measured with a stylus, a mechanical surface (boundary) or an electromagnetic surface (which simulates the surface envelope detected by an optical probe) models the real surface.

The following filtration techniques are available for NextGen’s NG-SR400T Surface Roughness Tester: RC,PC-RC,Gauss,D-P.

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