L-18Mitutoyo reserves the right to change any or all aspects of any product specication, including prices, designs and service content, without notice.L-18Denition of ParametersRpSampling lengthAmplitude Parameters (peak and valley)Maximum peak height of the primary prole PpMaximum peak height of the roughness prole RpMaximum peak height of the waviness prole WpLargest prole peak height Zp within a sampling lengthISO 4287: 1997, Amd.1: 2009 (JIS B 0261: 2013)Sampling lengthRvMaximum valley depth of the primary prole PvMaximum valley depth of the roughness prole RvMaximum valley depth of the waviness prole WvLargest prole valley depth Zv within a sampling lengthZpSampling lengthRzZvMaximum height of the primary prole PzMaximum height of the roughness prole RzMaximum height of the waviness prole WzSum of height of the largest prole peak height Zp and the largest prole valley depth Zv within a sampling length In the old JIS and ISO 4287-1: 1984, Rz was used to indicate the “ten point height of irregularities”. Care must be taken because differences between results obtained according to the existing and old standards are not always negligibly small. (Be sure to check whether the drawing instructions conform to existing or old standards.)Mean height of the primary prole elements PcMean height of the roughness prole elements RcMean height of the waviness prole elements WcMean value of the prole element heights Zt within a sampling lengthmmPc, Rc, Wc = Ztii=11Sampling lengthZt1Zt2Zt3Zt4Zt5Zt6ΣTotal height of the primary prole PtTotal height of the roughness prole RtTotal height of the waviness prole WtSum of the height of the largest prole peak height Zp and the largest prole valley depth Zv within the evaluation lengthEvaluation lengthSamplinglengthRtRzRzRzHybrid ParametersRoot mean square slope of the primary prole PΔqRoot mean square slope of the roughness prole RΔqRoot mean square slope of the waviness prole WΔqRoot mean square value of the ordinate slope dZ/dX within a sampling lengthdZ (x)dxdZ (x)dxdZ (x)dxdZ (x)dxdZ (x)dxCurves, Probability Density Function, and Related ParametersMaterial ratio curve of the prole (Abbott-Firestone curve)Curve representing the material ratio of the prole as a function of section level cSampling length020406080100Rmr(c),%Mean LineclnPmr (c), Rmr (c), Wmr (c) =Ml(c)Material ratio of the primary prole Pmr (c)Material ratio of the roughness prole Rmr (c)Material ratio of the waviness prole Wmr (c)Ratio of the material length of the prole elements Ml (c) at a given level c to the evaluation lengthSection height difference of the primary prole PδcSection height difference of the roughness prole RδcSection height difference of the waviness prole WδcVertical distance between two section levels of a given material ratio0102030405060708090100Rmr0Rmrc1c0RδcRδc = c (Rmr1) – c (Rmr2); Rmr1
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