SIST EN ISO 3611:2023
(Main)Geometrical product specifications (GPS) - Dimensional measuring equipment - Design and metrological characteristics of micrometers for external measurements (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:
mit Skalenanzeige;
mit Ziffernanzeige: mechanische oder elektronische Ziffernanzeige.
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
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 3611:2023
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)
SIST EN ISO 3611:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 3611:2023
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SIST EN ISO 3611:2023
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.
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SIST EN ISO 3611:2023
EN ISO 3611:2023 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 3611:2023
EN ISO 3611:2023 (E)
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.
3
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SIST EN ISO 3611:2023
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SIST EN ISO 3611:2023
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 2023
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SIST EN ISO 3611:2023
ISO 3611:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© 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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
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SIST EN ISO 3611:2023
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
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SIST EN ISO 3611:2023
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.
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SIST EN ISO 3611:2023
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.
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SIST EN ISO 3611:2023
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SIST EN ISO 3611:2023
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/
1
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SIST EN ISO 3611:2023
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
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SIST EN ISO 3611:2023
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 shown in Table 1 are typical dimensions and are not requirements of this document.
Figure 2 — Dimensions of a micrometer for external measurements
Table 1 — Dimensions of a micrometer for external measurements
Dimension Nominal value
Anvil length, L
1
Spindle length at maximum position, L
2
Maximum dimension measurable, L
3
a
Measuring span, L 25 mm
4
b
Frame depth, L
5
Spindle and anvil diameter, D
1
NOTE The dimensions D , L and L are important for the interchangeability of
1 1 2
accessories mounted on the measuring faces.
a
Usually, the measuring span L is 25 mm. Other measuring spans are possible.
4
b
Usually, the frame is shaped to permit the measurement of a cylinder whose
diameter is equal to the last value of the measuring range.
4.3 Types of indicating device
4.3.1 General
Several types of indicating device are possible:
— analogue indicating devices;
— digital indicating devices with mechanical digital display;
— digital indicating devices with electronic digital display.
NOTE Combinations of analogue and digital indicating devices are possible.
4.3.2 Analogue indicating devices
The measuring spindle should have a pitch of 0,5 mm or 1 mm. In the case of micrometers with spindles
having a pitch of 0,5 mm, the 0,5 mm graduation lines on the main scale shall be clearly distinguishable
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SIST EN ISO 3611:2023
ISO 3611:2023(E)
from the 1 mm graduation lines by means of their arrangement above and below the fiducial line. See
Figures 3 and 4.
The secondary scale on the thimble should have a scale graduated with 50 (pitch 0,5 mm) or 100 (pitch
1 mm) graduation lines, each scale interval representing 0,01 mm. For graduations of 0,001 mm, a
vernier scale can be added on the sleeve. See Figure 4.
Key
1 main scale
2 secondary scale
Figure 3 — Analogue indicating device with spindle pitch of 0,5 mm
Key
1 main scale 3 vernier scale
2 secondary scale
Figure 4 — Analogue indicating device with spindle pitch of 0,5 mm and
vernier scale interval of 0,001 mm
4.3.3 Digital indicating devices
The mechanical or electronic digital display should have a digital step of 0,01 mm or 0,001 mm.
4
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SIST EN ISO 3611:2023
ISO 3611:2023(E)
4.4 Frame
The rigidity of the frame shall be consistent with the measuring force. For hand-held micrometers, the
frame can be insulated to prevent body heat from being transmitted.
4.5 Measuring force limiting device
Each micrometer for external measurements shall be provided with a measuring force limiting device
integrated in the thimble or in the fast drive.
NOTE Typical measuring force limiting devices include ratchet and friction devices.
The measuring force generated by the measuring force limiting device should exceed the frictional
force of the spindle. See 5.7.
5 Metrological characteristics
5.1 General
The metrological characteristics and associated maximum permissible error (MPE) values apply
to any indications permitted for use of the micrometer for external measurements as defined by the
manufacturer and when used in accordance with the manufacturer’s recommendations. The MPE
values cannot be smaller than the digital step but may be smaller than the scale interval. See Clause B.6
for more information on reading indications between scale marks.
5.2 Rated operating conditions
The manufacturer shall state any rated operating conditions that apply to the MPE values. All MPE
values apply at a rated operating condition for temperature of 20 °C exactly, unless otherwise stated.
Test values shall therefore be corrected to 20 °C to obtain the error of indication that the micrometer
for external measurements would have produced had the test been performed at 20 °C. If temperature
correction to 20 °C is not performed, this document allows the consequences to be included in the
evaluation of the measurement uncertainty of the test values (see 6.2).
A micrometer for external measurements is a manually operated measuring instrument, and the user of
the micrometer for external measurements is therefore necessarily included in the measuring system
that is specified in accordance with this document. The user shall be reasonably skilled in the operation
of the micrometer for external measurements.
5.3 Reference point
Each micrometer for external measurements shall be provided with user-accessible means for setting
the micrometer to zero or to the reference point. For further information, see Annex B. The metrological
characteristics described in this document apply when the micrometer for external measurements
is properly set in accordance with the manufacturer’s recommendations, and the reference point
is considered fixed at the beginning of the measuring range when evaluating the metrological
characteristics.
5.4 Test methods
The errors of indication shall be tested with suitable measurement standards, e.g. with gauge blocks in
accordance with ISO 3650. When testing conformity to specification, sufficient testing shall be used to
establish confidence in the results.
For acceptance testing, the customer is free to choose the test points; however, unless otherwise
specified, the acceptance testing shall conform to the requirements in this document.
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SIST EN ISO 3611:2023
ISO 3611:2023(E)
When considering test points, appropriate consideration shall be given to the design of the micrometer
for external measurements and operating conditions that can indicate the presence of short-length
cyclic errors.
See Annex A for guidelines on calibration and test methods.
5.5 Length measurement error, E (limited by E )
MPE
5.5.1 General
The length measurement error, E, is the error of indication when full measuring face contact is employed
to measure a measurement standard, e.g. gauge blocks, which cover the entire measuring faces of the
micrometer for external measurements. This error is calculated as the signed difference between the
indication of the micrometer and the reference value of the measurement standard.
The averaging of multiple indications is not permitted when calculating the length measurement error.
As such, the influence of repeatability is included in the test for the length measurement error.
5.5.2 Test point selection
Once the reference point has been properly set (see 5.3), the length measurement error shall be tested
by measuring measurement standards at multiple test points located across the measuring range of the
micrometer. A minimum of five test points shall be taken across the measuring range. At least one test
point shall be at 90 % of the measuring span or greater from the reference point. The test points shall
be app
...
SLOVENSKI STANDARD
oSIST prEN ISO 3611:2022
01-julij-2022
Specifikacija geometrijskih veličin izdelka (GPS) - Oprema za merjenje dolžin:
mikrometri za zunanje meritve - Konstrukcijske in meroslovne značilnosti (ISO/DIS
3611:2022)
Geometrical product specifications (GPS) - Dimensional measuring equipment:
Micrometers for external measurements - Design and metrological characteristics
(ISO/DIS 3611:2022)
Geometrische Produktspezifikation (GPS) – Längenmessgeräte: Bügelmessschrauben –
Konstruktionsmerkmale und messtechnische Merkmale (ISO/DIS 3611:2022)
Spécification géométrique des produits (GPS) - Équipement de mesurage dimensionnel:
Micromètres d'extérieur - Caractéristiques de conception et caractéristiques
métrologiques (ISO/DIS 3611:2022)
Ta slovenski standard je istoveten z: prEN ISO 3611
ICS:
17.040.30 Merila Measuring instruments
17.040.40 Specifikacija geometrijskih Geometrical Product
veličin izdelka (GPS) Specification (GPS)
oSIST prEN ISO 3611:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 3611:2022
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oSIST prEN ISO 3611:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 3611
ISO/TC 213 Secretariat: BSI
Voting begins on: Voting terminates on:
2022-05-18 2022-08-10
Geometrical product specifications (GPS) — Dimensional
measuring equipment: Micrometers for external
measurements — Design and metrological characteristics
Spécification géométrique des produits (GPS) — Équipement de mesurage dimensionnel: Micromètres
d'extérieur — Caractéristiques de conception et caractéristiques métrologiques
ICS: 17.040.30
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 3611:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
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oSIST prEN ISO 3611:2022
ISO/DIS 3611:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
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oSIST prEN ISO 3611:2022
ISO/DIS 3611:2022(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 devices. 4
4.3.1 General . 4
4.3.2 Analogue indicating devices . 4
4.3.3 Digital indicating devices . 4
4.4 Frame . 4
4.5 Measuring force limiting device . 4
5 Metrological characteristics . 6
5.1 General . 6
5.2 Rated operating conditions . 6
5.3 Reference point . 6
5.4 Test methods . 6
5.5 Full surface contact error, J (limited by J ) . 6
MPE
5.5.1 General . 6
5.5.2 Test point selection . 7
5.6 Variation in length error, V (limited by V ) . 7
MPE
5.6.1 General . 7
5.6.2 Number of tests . 7
5.6.3 Testing with optical parallels . 7
5.7 Measuring forces (limited by MPL) . 8
5.8 MPE and MPL values . 8
6 Determination of conformance to specifications .11
6.1 General . 11
6.2 Measurement uncertainty . . 11
6.3 Decision rule . 11
7 Marking . .11
Annex A (informative) Calibration guidelines for metrological characteristics.12
Annex B (informative) Notes on use .13
Annex C (informative) Relation to the GPS matrix model .14
Bibliography .15
iii
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oSIST prEN ISO 3611:2022
ISO/DIS 3611:2022(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
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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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
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World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product
specifications and verification.
This third edition cancels and replaces the second edition (ISO 3611:2010), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— general design characteristics have been removed and reference to ISO 14978:2018 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.
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oSIST prEN ISO 3611:2022
ISO/DIS 3611:2022(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 Masterplan 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.
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oSIST prEN ISO 3611:2022
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oSIST prEN ISO 3611:2022
DRAFT INTERNATIONAL STANDARD ISO/DIS 3611:2022(E)
Geometrical product specifications (GPS) — Dimensional
measuring equipment: Micrometers for external
measurements — Design and metrological characteristics
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 3650, Geometrical Product Specifications (GPS) — Length standards — Gauge blocks
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
measurement (GUM: 1995)
ISO/IEC Guide 99:2007, 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 14978:2018,
ISO/IEC Guide 99:2007, and the following 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/
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oSIST prEN ISO 3611:2022
ISO/DIS 3611:2022(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
3.2.1
full measuring face contact
contact between the full area of the measuring face and an integral feature of a workpiece
3.2.2
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.
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oSIST prEN ISO 3611:2022
ISO/DIS 3611:2022(E)
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
4.2 Dimensions
The manufacturer shall state important dimensions, such as those shown in Figure 2 and Table 1. The
values shown in Table 1 are typical dimensions and are not requirements of this document.
Figure 2 — Dimensions of a micrometer for external measurements
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oSIST prEN ISO 3611:2022
ISO/DIS 3611:2022(E)
Table 1 — Dimensions of a micrometer for external measurements
Dimension Nominal value
Anvil length, L
1
Spindle length at maximum position, L
2
Maximum dimension measurable, L
3
c
Measuring span, L 25 mm
4
b
Frame depth, L
5
a
Spindle and anvil diameter, D 6,35 mm, 6,5 mm, 7,5 mm, 8 mm
1
NOTE The dimensions D , L and L are important for the interchangeability of
1 1 2
accessories mounted on the measuring faces.
a
At the manufacturer's discretion. Other diameters are possible.
b
Usually, the frame is shaped to permit the measurement of a cylinder whose
diameter is equal to the last value of the measuring range.
c L
Usually, the measuring span is 25 mm. Other measuring spans are possible.
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4.3 Types of indicating devices
4.3.1 General
Several types of indicating devices are possible:
— analogue indicating devices;
— digital indicating devices with mechanical digital display;
— digital indicating devices with electronic digital display.
NOTE Combinations of analogue and digital indicating devices are possible.
4.3.2 Analogue indicating devices
The measuring spindle should have a pitch of 0,5 mm or 1 mm. In the case of micrometers with spindles
having a pitch of 0,5 mm, the 0,5 mm graduation lines on the main scale shall be clearly distinguishable
from the 1 mm graduation lines by means of their arrangement above and below the fiducial line. See
Figures 3 and 4.
The secondary scale on the thimble should have a scale graduated with 50 (pitch 0,5 mm) or 100 (pitch
1 mm) graduation lines, each scale interval representing 0,01 mm. For graduations of 0,001 mm, a
vernier scale can be added on the sleeve. See Figure 4.
4.3.3 Digital indicating devices
The mechanical or electronic digital display should have a digital step of 0,01 mm or 0,001 mm.
4.4 Frame
The rigidity of the frame shall be consistent with the measuring force. For hand-held micrometers, the
frame can be insulated to prevent body heat from being transmitted.
4.5 Measuring force limiting device
Each micrometer for external measurements shall be provided with a measuring force limiting device
integrated in the thimble or in the fast drive.
The measuring force generated by the measuring force limiting device should exceed the frictional
force of the spindle. See 5.7.
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