prEN ISO 25178-606
(Main)Geometrical product specifications (GPS) - Surface texture: Areal - Part 606: Design and characteristics of non-contact (focus variation) instruments (ISO/DIS 25178-606:2025)
Geometrical product specifications (GPS) - Surface texture: Areal - Part 606: Design and characteristics of non-contact (focus variation) instruments (ISO/DIS 25178-606:2025)
ISO 25178-606:2015 defines the metrological characteristics of a particular non-contact method measuring surface texture using a focus variation (FV) sensor.
Geometrische Produktspezifikation (GPS) - Oberflächenbeschaffenheit: Flächenhaft - Teil 606: Aufbau und Merkmale von berührungslos messenden Geräten (Fokusvariation) (ISO/DIS 25178-606:2025)
Spécification géométrique des produits (GPS) - État de surface: Surfacique - Partie 606: Conception et caractéristiques des instruments sans contact (à variation de focale) (ISO/DIS 25178-606:2025)
L'ISO 25178-606:2015 définit les caractéristiques métrologiques d'une méthode de mesure sans contact particulière de l'état de surface au moyen d'un capteur à variation de focale (FV).
Specifikacija geometrijskih veličin izdelka (GPS) - Tekstura površine: ploskovna - 606. del: Načrtovanje in značilnosti brezkontaktnih instrumentov (sprememba ostrine) (ISO/DIS 25178-606:2025)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2025
Specifikacija geometrijskih veličin izdelka (GPS) - Tekstura površine: ploskovna -
606. del: Načrtovanje in značilnosti brezkontaktnih instrumentov (sprememba
ostrine) (ISO/DIS 25178-606:2025)
Geometrical product specifications (GPS) - Surface texture: Areal - Part 606: Design and
characteristics of non-contact (focus variation) instruments (ISO/DIS 25178-606:2025)
Geometrische Produktspezifikation (GPS) - Oberflächenbeschaffenheit: Flächenhaft -
Teil 606: Aufbau und Merkmale von berührungslos messenden Geräten (Fokusvariation)
(ISO/DIS 25178-606:2025)
Spécification géométrique des produits (GPS) - État de surface: Surfacique - Partie 606:
Conception et caractéristiques des instruments sans contact (à variation de focale)
(ISO/DIS 25178-606:2025)
Ta slovenski standard je istoveten z: prEN ISO 25178-606
ICS:
17.040.20 Lastnosti površin Properties of surfaces
17.040.40 Specifikacija geometrijskih Geometrical Product
veličin izdelka (GPS) Specification (GPS)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 25178-606
ISO/TC 213
Geometrical product specifications
Secretariat: BSI
(GPS) — Surface texture: Areal —
Voting begins on:
Part 606: 2025-02-17
Design and characteristics of
Voting terminates on:
2025-05-12
non-contact (focus variation)
instruments
ICS: 17.040.40
THIS DOCUMENT IS A DRAFT CIRCULATED
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Reference number
ISO/DIS 25178-606:2025(en)
DRAFT
ISO/DIS 25178-606:2025(en)
International
Standard
ISO/DIS 25178-606
ISO/TC 213
Geometrical product specifications
Secretariat: BSI
(GPS) — Surface texture: Areal —
Voting begins on:
Part 606:
Design and characteristics of
Voting terminates on:
non-contact (focus variation)
instruments
ICS: 17.040.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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Published in Switzerland Reference number
ISO/DIS 25178-606:2025(en)
ii
ISO/DIS 25178-606:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Instrument requirements . 5
5 Metrological characteristics . 6
6 Design features . 6
7 General information . 7
Annex A (informative) Components of a focus variation instrument . 8
Annex B (informative) Sources of measurement error for focus variation . 14
Annex C (informative) Relationship to the GPS matrix model . 17
Bibliography .18
iii
ISO/DIS 25178-606:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product
specifications and verification.
This second edition cancels and replaces the first edition (ISO 25178:606:2015), which has been technically
revised.
The main changes are as follows:
— adoption of the new structure of the series ISO 25178-60x documents;
— extension to focus variation using fixed pattern illumination.
A list of all parts in the ISO 25178 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO/DIS 25178-606:2025(en)
Introduction
This document is a geometrical product specification (GPS) standard and is to be regarded as a general GPS
standard (see ISO 14638). It influences the chain link F of the chain of standards on profile and areal surface
texture.
The ISO GPS matrix model given in ISO 14638 gives an overview of the ISO GPS system of which this
document is a part. The fundamental rules of ISO GPS given in ISO 8015 apply to this document and the
default decision rules given in ISO 14253-1 apply to specifications made in accordance with this document,
unless otherwise indicated.
For more detailed information of the relation of this document to other standards and the GPS matrix model,
see Annex C.
This document includes normative terms and definitions relevant to the focus variation method for the
measurement of areal surface topography. The informative Annex A briefly summarizes focus variation
measurement instruments and methods to clarify the normative definitions and to provide a foundation
for informative Annex B, which describes common sources of errors and their relation to the metrological
characteristics of focus variation.
NOTE Portions of this document, particularly the informative sections, describe patented systems and methods.
This information is provided only to assist users in understanding the operating principles of focus variation. This
document is not intended to establish priority for any intellectual property, nor does it imply a license to proprietary
technologies described herein.
v
DRAFT International Standard ISO/DIS 25178-606:2025(en)
Geometrical product specifications (GPS) — Surface
texture: Areal —
Part 606:
Design and characteristics of non-contact (focus variation)
instruments
1 Scope
This document specifies the design and characteristics of focus variation instruments for areal measurement
of surface topography. Because surface profiles can be extracted from areal surface topography data the
methods described in this document can be applied to profiling measurements as well.
This document deals with focus variation without pattern illumination or with fixed pattern illumination.
The methods using varying pattern illumination during the measurement are excluded from this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 25178-600:2019, Geometrical product specifications (GPS) — Surface texture: Areal — Part 600:
Metrological characteristics for areal topography measuring methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
focus variation
FV
measurement method whereby the sharpness of a series of surface images that is acquired during an axial
scan in an optical instrument is used to measure the surface topography
Note 1 to entry: In this document, surface image is an image of a surface obtained by capturing the reflected light from
the surface with or without a fixed pattern illumination.
Note 2 to entry: In this document, sharpness is a quantity of the surface image calculated by the neighbourhood
information indicating best focus. Other names for sharpness are for example contrast.
Note 3 to entry: Focus variation without fixed pattern illumination only works on optically rough surfaces
[ISO 25178-600:2019, 3.4.5]. If fixed pattern illumination is used, optically smooth surfaces [ISO 25178-600:2019,
3.4.4] can also be measured.
ISO/DIS 25178-606:2025(en)
3.2
focus variation sensor
device that converts the height of points on the surface into signals during measurement using the focus
variation method
3.3
axial scan
mechanical or optical displacement between the sample under inspection and the imaging optics
Note 1 to entry: The optic
...
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