EN ISO 3611:2023

Geometrical product specifications (GPS) - Dimensional measuring equipment - Design and metrological characteristics of micrometers for external measurements (ISO 3611:2023)

This document provides the most important design and metrological characteristics of micrometers for external measurements:
—    with analogue indication;
—    with digital indication: mechanical or electronic digital display.

Geometrische Produktspezifikation (GPS) - Längenmessgeräte - Konstruktionsmerkmale und messtechnische Merkmale von Bügelmessschrauben für die Außenmessung (ISO 3611:2023)

Dieses Dokument enthält die wichtigsten Konstruktionsmerkmale und messtechnischen Merkmale für Bügelmessschrauben für die Außenmessung:
-   mit analoger Anzeige;
-   mit digitaler Anzeige: mechanische oder elektronische Digitalanzeige.

Spécification géométrique des produits (GPS) - Équipement de mesurage dimensionnel - Caractéristiques de conception et caractéristiques métrologiques des micromètres d'extérieur (ISO 3611:2023)

Le présent document fournit les caractéristiques de conception et les caractéristiques métrologiques les plus importantes des micromètres d’extérieur:
—    avec indication analogique;
—    avec indication numérique: affichage numérique mécanique ou électronique.

Specifikacija geometrijskih veličin izdelka (GPS) - Oprema za merjenje dolžin - Konstrukcijske in meroslovne značilnosti mikrometrov za zunanje meritve (ISO 3611:2023)

Ta dokument določa najpomembnejše konstrukcijske in meroslovne značilnosti mikrometrov za zunanje meritve:
–    z analognim zapisom;
–    z digitalnim zapisom (mehanski ali elektronski prikaz).

General Information

• Status: Published
• Publication Date: 30-May-2023
• ICS: 17.040.30 - Measuring instruments
• ICS: 17.040.40 - Geometrical Product Specification (GPS)
• Technical Committee: CEN/TC 290 - Dimensional and geometrical product specification and verification
• Drafting Committee: CEN/TC 290 - Dimensional and geometrical product specification and verification
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 31-May-2023
• Completion Date: 31-May-2023
• Ref Project: SIST EN ISO 3611:2023 - Geometrical product specifications (GPS) - Dimensional measuring equipment - Design and metrological characteristics of micrometers for external measurements (ISO 3611:2023)

Relations

• Replaces: EN ISO 3611:2010 - Geometrical product specifications (GPS) - Dimensional measuring equipment: Micrometers for external measurements - Design and metrological characteristics (ISO 3611:2010)
• Effective Date: 19-Jan-2023

Overview

EN ISO 3611:2023 / ISO 3611:2023 is a Geometrical Product Specification (GPS) standard that defines the principal design and metrological characteristics of micrometers for external measurements. It covers both analogue and digital (mechanical or electronic display) micrometers and was adopted by CEN as EN ISO 3611:2023. The standard replaces the 2010 edition and aligns micrometer requirements with the GPS framework used for dimensional measuring equipment.

Key topics and requirements

The standard addresses the following technical areas without prescribing specific numeric tolerances in this summary:

• Design characteristics and nomenclature
  • Definitions of micrometer features, frame, spindle and anvil geometry, and indicating device types (analogue and digital).
• Types of indicating devices
  • Requirements and descriptions for analogue indication and digital displays (mechanical or electronic).
• Metrological characteristics
  • Concepts such as rated operating conditions, reference point for measurements, and test methods used to verify performance.
• Measurement performance metrics
  • Parameters like length measurement error (E), variation in length measurement error (V), and measuring forces - including rules for selecting test points and number of tests.
• Classification and conformity
  • A classification system for maximum permissible errors (MPE), procedures for determination of conformity, consideration of measurement uncertainty, and decision rules for pass/fail.
• Supporting guidance
  • Annexes include calibration guidelines, notes on use, and the relation to the GPS matrix model.
• Marking
  • Requirements for labelling and identifying micrometers in accordance with metrological characteristics.

Applications and users

EN ISO 3611:2023 is practical for organizations and professionals involved with dimensional measurements:

• Micrometer manufacturers - to design and certify products that meet GPS metrological expectations.
• Calibration and metrology laboratories - to define test methods, calibration procedures, and measurement uncertainty practices.
• Quality and inspection engineers - to select appropriate micrometers, interpret MPE classifications, and apply decision rules per GPS.
• Procurement and compliance teams - to specify requirements for suppliers and ensure conformity with European/national standards.
• Standards bodies and trainers - for harmonized education and implementation of GPS rules.

Related standards

This standard is part of the ISO GPS system and relates to:

• ISO 14978 (design characteristics general reference)
• ISO 14638 (GPS matrix model)
• ISO 14253-1 and ISO 8015 (decision rules and GPS fundamentals)

Using EN ISO 3611:2023 helps ensure consistent, traceable external dimensional measurement with micrometers, improves interoperability between suppliers and labs, and supports reliable conformity assessment within the GPS framework.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2023
Specifikacija geometrijskih veličin izdelka (GPS) - Oprema za merjenje dolžin -
Konstrukcijske in meroslovne značilnosti mikrometrov za zunanje meritve (ISO
3611:2023)
Geometrical product specifications (GPS) - Dimensional measuring equipment - Design
and metrological characteristics of micrometers for external measurements (ISO
3611:2023)
Geometrische Produktspezifikation (GPS) - Längenmessgeräte - Konstruktionsmerkmale
und messtechnische Merkmale von Bügelmessschrauben für die Außenmessung (ISO
3611:2023)
Spécification géométrique des produits (GPS) - Équipement de mesurage dimensionnel
- Caractéristiques de conception et caractéristiques métrologiques des micromètres
d'extérieur (ISO 3611:2023)
Ta slovenski standard je istoveten z: EN ISO 3611:2023
ICS:
17.040.30 Merila Measuring instruments
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.

EN ISO 3611
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2023
EUROPÄISCHE NORM
ICS 17.040.30 Supersedes EN ISO 3611:2010
English Version
Geometrical product specifications (GPS) - Dimensional
measuring equipment - Design and metrological
characteristics of micrometers for external measurements
(ISO 3611:2023)
Spécification géométrique des produits (GPS) - Geometrische Produktspezifikation (GPS) -
Équipement de mesurage dimensionnel - Längenmessgeräte - Konstruktionsmerkmale und
Caractéristiques de conception et caractéristiques messtechnische Merkmale von Bügelmessschrauben
métrologiques des micromètres d'extérieur (ISO für die Außenmessung (ISO 3611:2023)
3611:2023)
This European Standard was approved by CEN on 5 May 2023.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3611:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 3611:2023) has been prepared by Technical Committee ISO/TC 213
"Dimensional and geometrical product specifications and verification" in collaboration with Technical
Committee CEN/TC 290 “Dimensional and geometrical product specification and verification” the
secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2023, and conflicting national standards
shall be withdrawn at the latest by November 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 3611:2010.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 3611:2023 has been approved by CEN as EN ISO 3611:2023 without any modification.

INTERNATIONAL ISO
STANDARD 3611
Third edition
2023-05
Geometrical product specifications
(GPS) — Dimensional measuring
equipment — Design and metrological
characteristics of micrometers for
external measurements
Spécification géométrique des produits (GPS) — Équipement
de mesurage dimensionnel — Caractéristiques de conception et
caractéristiques métrologiques des micromètres d'extérieur
Reference number
ISO 3611:2023(E)
ISO 3611:2023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 3611:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design characteristics . 2
4.1 General design and nomenclature. 2
4.2 Dimensions . 3
4.3 Types of indicating device . 3
4.3.1 General . 3
4.3.2 Analogue indicating devices . 3
4.3.3 Digital indicating devices . 4
4.4 Frame . 5
4.5 Measuring force limiting device . 5
5 Metrological characteristics . 5
5.1 General . 5
5.2 Rated operating conditions . 5
5.3 Reference point . 5
5.4 Test methods . 5
5.5 Length measurement error, E (limited by E ) . 6
MPE
5.5.1 General . 6
5.5.2 Test point selection . 6
5.6 Variation in length measurement error, V (limited by V ) . 6
MPE
5.6.1 General . 6
5.6.2 Number of tests . 7
5.6.3 Testing with optical parallels . 7
5.7 Measuring forces . 7
5.8 Specifications . 7
5.8.1 General . 7
5.8.2 Classification system . 7
6 Determination of conformity to specifications .10
6.1 General . 10
6.2 Measurement uncertainty . . 10
6.3 Decision rule . 10
7 Marking . .10
Annex A (informative) Calibration guidelines for metrological characteristics .11
Annex B (informative) Notes on use .12
Annex C (informative) Relation to the GPS matrix model .13
Bibliography .14
iii
ISO 3611:2023(E)
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 document 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, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 290, Dimensional and geometrical product specification and verification,
in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 3611:2010), which has been technically
revised.
The main changes are as follows:
— general design characteristics have been removed and reference to ISO 14978:2018 has been
included;
— metrological characteristics have been clarified and modified;
— requirements for test methods have been included;
— classification system of maximum permissible errors has been added.
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 3611:2023(E)
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 links for measuring equipment and calibration on
size and distance in the general GPS matrix (see Annex C).
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; see ISO/TR 14253-6 for additional information on the selection
of alternative decision rules.
For more detailed information on the relation of this document to other standards and the GPS matrix
model, see Annex C.
v
INTERNATIONAL STANDARD ISO 3611:2023(E)
Geometrical product specifications (GPS) — Dimensional
measuring equipment — Design and metrological
characteristics of micrometers for external measurements
1 Scope
This document provides the most important design and metrological characteristics of micrometers for
external measurements:
— with analogue indication;
— with digital indication: mechanical or electronic digital display.
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 14253-1, Geometrical product specifications (GPS) — Inspection by measurement of workpieces and
measuring equipment — Part 1: Decision rules for verifying conformity or nonconformity with specifications
ISO 14253-5, Geometrical product specifications (GPS) — Inspection by measurement of workpieces and
measuring equipment — Part 5: Uncertainty in verification testing of indicating measuring instruments
ISO/TR 14253-6, Geometrical product specifications (GPS) — Inspection by measurement of workpieces
and measuring equipment — Part 6: Generalized decision rules for the acceptance and rejection of
instruments and workpieces
ISO 14978:2018, Geometrical product specifications (GPS) — General concepts and requirements for GPS
measuring equipment
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
measurement (GUM: 1995)
ISO/IEC Guide 99, International vocabulary of metrology — Basic and general concepts and associated
terms (VIM)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14978, ISO/IEC Guide 99 and
the following apply.
ISO and IEC maintain terminology 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/
ISO 3611:2023(E)
3.1
micrometer for external measurements
measuring instrument which gives the evaluation of a dimensional quantity of an external feature of a
workpiece on the basis of movement of a spindle with a measuring face, moving relatively to a material
measure and an anvil, with the movement generated by a screw thread
Note 1 to entry: The guiding elements of the spindle and of the anvil are connected by a frame.
Note 2 to entry: Usually, micrometers for external measurements have a thread as a material measure with the
anvil, spindle and material measure arranged in a line.
3.2
measuring face contact
contact between the measuring face and an integral feature of a workpiece
3.3
full measuring face contact
contact between the full area of the measuring face and an integral feature of a workpiece
3.4
partial measuring face contact
contact between a partial area of the measuring face and an integral feature of a workpiece
4 Design characteristics
4.1 General design and nomenclature
The design of a micrometer for external measurements shall follow the general guidelines in ISO 14978,
including the common design characteristics in ISO 14978:2018, Annex C. See Figure 1 for an example
of the general design.
Key
1 measuring faces 7 sleeve
2 anvil 8 fiducial line
3 measuring spindle 9 analogue indication
4 frame 10 thimble
5 thermally insulating plate 11 fast drive
6 spindle clamp
Figure 1 — Nomenclature and general design of a micrometer for external measurements
ISO 3611:2023(E)
4.2 Dimensions
The manufacturer shall state important dimensions, such as those shown in Figure 2 and Table 1. The
values
...