Overview
EN ISO 25178-701:2010 - part of the ISO 25178 areal surface texture series - defines calibration and measurement standards for contact (stylus) areal surface texture instruments. It specifies the characteristics of material measurement standards, methods to estimate residual errors, and procedures for calibration, acceptance testing and periodical re‑verification. The standard supports reliable assessment of the fundamental corrected quantities (X, Y, Z) and helps quantify measurement uncertainty related to instrument metrology.
Key topics
- Scope and purpose
- Calibration of metrological characteristics for areal surface texture stylus instruments.
- Procedures to assess and correct systematic errors and to report instrument status.
- Measurement standards covered
- Types include groove standards (ER1/ER2/ER3), sphere/plane intersection (ES), contour profiles (CS) and crossed‑grating standards (CG).
- Standards designed to exercise X, Y and Z calibration and perpendicularity between X and Y drives.
- Error estimation and uncertainty
- Methods for assessing residual errors on corrected X, Y, Z quantities.
- Guidance to evaluate the portion of measurement uncertainty coming from instrument metrological characteristics.
- Calibration and verification procedures
- Tests for acceptance and periodic re‑verification, plus decision rules for corrective actions and user adjustments (linked to ISO 25178-601 adjustment coefficients Cx, Cy, Cz).
- Software vs. material standards
- Material standards verify geometrical/mechanical performance; software measurement standards (ISO 5436‑2, ISO 25178‑7) validate filtering and parameter computation algorithms.
- Informative annexes
- Annex A: assessment of residual errors
- Annex B: example instrument data sheet
- Annex C: relation with the GPS matrix
Applications and users
This standard is essential for:
- Calibration laboratories and national metrology institutes performing acceptance and periodic calibration of stylus profilometers.
- Manufacturers of contact areal surface texture instruments for defining nominal and verifiable characteristics.
- Quality engineers, inspection specialists and R&D teams using areal surface texture parameters for product verification and process control.
- Organizations seeking traceable measurement uncertainty and conformity with GPS (Geometrical Product Specification) practice.
Practical uses include instrument acceptance testing, routine re‑verification, uncertainty budgeting for surface texture measurements, and validating instrument corrections for X/Y/Z scale and orthogonality.
Related standards
Keywords: EN ISO 25178-701:2010, areal surface texture, stylus instruments, calibration, measurement standards, surface texture metrology, GPS, instrument verification.