Profile depth

Profile depth Pt (total height of P-profile) is the sum of the largest profile peak height and the largest profile valley depth of the P-profile within the evaluation length ln (reference length). The reference length has to be stated.

P-profile (primary profile) is computed from the traced profile

• by excluding the nominal form by using the method of best fit least squares of the type indicated in the drawing, e.g. a linear regression line
  and
• by excluding ultra-short wavelengths from the evaluation by using the λs profile filter, which considerably increases comparability. (EN ISO 3274)