Iso 4288 free download

Peaks will cause Xsk to become positive and valleys will cause Xsk to become negative. The Kurtosis describes the sharpness of the height distribution, A Gaussian distribution has a Kurtosis close to 3.

Wider distributions have a kurtosis less than 3 and narrower distributions a kurtosis greater than 3. High peaks or deep valleys will influence the kurtosis strongly. Percentage of the profile with height values greater than Zmax — c calculated over the entire Evaluation Length. Zmax is the maximum height value within the Evaluation Length.

In practice this is a read out of the abscissa value for a given ordinate, Zmax — c , on the Material Ratio Curve Abbott-Firestone curve. Material Ratio Curve. The relative amount of material above a certain height level in percent. Mean width of profile elements within the Evaluation Length Profile elements are neighboring peak-valley pairs. National metrology laboratories such as NPL [ 36 ] and PTB [ 39 ] recommend calculating the profile element parameters over the evaluation length rather than for one sampling length at a time as stated in the ISO standard.

This gives much more robust estimates for the profile element parameters. This differs from the ISO standard where local Rz values Rz1, Rz2 … for each sampling length interval are used. The roughness cut-off is identical to the roughness sampling length. An algorithm proposed by NPL [ 36 ] for merging peaks and valleys which fall below the height or spacing discrimination criteria is used. Profile Elements consist of neighboring Peak and Valleys fulfilling the height and spacing criteria.

Each profile element is described by its height and its width. Maximum profile peak height: R p , W p ,P p. The maximum height value within a Sampling Length. Maximum profile valley depth: R v , W v , P v. The minimum height value within a Sampling Length. Total height of the profile: R t , W t , P t. The difference between the maximum height value and the minimum height value within the Evaluation Length.

Maximum height of the profile: R z , W z , P z. This is the difference between the maximum height and the minimum height within a sampling Length. Arithmetic mean deviation of the profile: R a , W a , P a. Root mean square deviation of the profile: R q , W q , P q. Rz value Rq value An alternative measure of surface roughness is the Rz value. ISO [8] defines Rz as the maximum height of.

ISO TS : A single measuring value can therefore not provide a complete statement concerning the observance of the permissible parameter tolerances. International Customer Service.

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