P tunnussuurus (esmane tunnussuurus) on pinnatekstuuri parameeter, mis arvutatakse filtreerimata esmase profiili (P profiili) põhjal ja see esindab üldist pinnatekstuuri, sealhulgas nii karedust kui ka lainelisust, pärast ainult kõige lühemate lainepikkuste komponentide eemaldamist piirfiltri (λs) abil.
The P-parameter (primary profile parameter) is a surface texture parameter calculated from the unfiltered primary profile (P-profile). They represent the overall surface texture, including both roughness and waviness, after removing only the very shortest wavelength components using a cut-off filter (λs).
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