ISO 17123-6:2025

Optics and optical instruments — Field procedures for testing geodetic and surveying instruments — Part 6: Rotating lasers

This document specifies field procedures to be adopted when determining and evaluating the precision (repeatability) of rotating lasers, the uncertainty of measurement results obtained by geodetic instruments and their ancillary equipment, particularly when used in building and surveying measurements for levelling tasks. Primarily, these tests are intended to be field verifications of the suitability of a particular instrument for the immediate task at hand and to satisfy the requirements of other standards. They are not proposed as tests for acceptance or performance evaluations that are more comprehensive in nature. This document can be considered as one of the first steps in the process of evaluating the uncertainty of a measurement (more specifically a measurand). The uncertainty of a result of a measurement is dependent on a number of parameters. Therefore, this document differentiates between various quality measures and testing objectives, including repeatability and reproducibility (between-day repeatability), and provides a thorough assessment of all potential error sources, as specified by ISO/IEC Guide 98-3 and ISO 17123-1. These field procedures have been developed specifically for in situ applications without the need for special ancillary equipment and are purposefully designed to minimize atmospheric influences.

Optique et instruments d'optique — Méthodes d'essai sur site des instruments géodésiques et d'observation — Partie 6: Lasers rotatifs

General Information

• Status: Published
• Publication Date: 02-Jul-2025
• ICS: 17.180.30 - Optical measuring instruments
• Technical Committee: ISO/TC 172/SC 6 - Geodetic and surveying instruments
• Drafting Committee: ISO/TC 172/SC 6/WG 4 - Field procedures and ancillary devices
• Current Stage: 6060 - International Standard published
• Start Date: 03-Jul-2025
• Due Date: 15-Oct-2025
• Completion Date: 03-Jul-2025

Relations

• Revises: ISO 17123-6:2022 - Optics and optical instruments — Field procedures for testing geodetic and surveying instruments — Part 6: Rotating lasers
• Effective Date: 28-Oct-2023

Standards Content (Sample)

International
Standard
ISO 17123-6
Fourth edition
Optics and optical instruments —
2025-07
Field procedures for testing
geodetic and surveying
instruments —
Part 6:
Rotating lasers
Optique et instruments d'optique — Méthodes d'essai sur site des
instruments géodésiques et d'observation —
Partie 6: Lasers rotatifs
Reference number
© ISO 2025
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
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms. 2
4.1 Symbols .2
4.2 Abbreviations .3
5 General . 3
5.1 Requirements .3
5.2 Procedure 1: simplified test procedure .3
5.3 Procedure 2: full test procedure.4
6 Simplified test procedure . 5
6.1 Configuration of the test field .5
6.2 Measurements . .6
6.3 Calculation .6
7 Full test procedure . 7
7.1 Configuration of the test line .7
7.2 Measurements .8
7.3 Calculation .9
7.4 Statistical test . 13
7.4.1 General . 13
7.4.2 Question a) .14
7.4.3 Question b) .14
7.4.4 Question c) .14
7.4.5 Question d) . 15
8 Influence quantities and combined standard uncertainty evaluation (Type A and Type
B) .15
Annex A (informative) Example of the simplified test procedure . 17
Annex B (informative) Example of the full test procedure .20
Annex C (informative) Example for the calculation of an uncertainty budget .27

iii
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 172, Optics and photonics, Subcommittee SC 6,
Geodetic and surveying instruments.
This fourth edition cancels and replaces the third edition (ISO 17123-6:2022), which has been technically
revised.
The main changes are as follows:
— the first paragraph of Introduction has been deleted as already cited as first paragraph of the Scope;
— more flexible configuration of the test line and updating of the mathematical model;
— harmonization of terminology and symbols;
— correction of errors.
A list of all parts in the ISO 17123 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
Introduction
The definition and concept of uncertainty as a quantitative attribute to the final result of measurement was
developed mainly in the last two decades, even though error analysis has already long been a part of all
measurement sciences. After several stages, the CIPM (Comité International des Poids et Mesures) referred
the task of developing a detailed guide to ISO. Under the responsibility of the ISO Technical Advisory Group
on Metrology (TAG 4), and in conjunction with six worldwide metrology organizations, a guidance document
on the expression of measurement uncertainty was compiled with the objective of providing rules for use
within standardization, calibration, laboratory, accreditation and metrology services. ISO/IEC Guide 98-3
was first published as the Guide to the Expression of Uncertainty in Measurement (GUM) in 1995.
With the introduction of uncertainty in measurement in ISO 17123 (all parts), it is intended to finally
provide a uniform, quantitative expression of measurement uncertainty in geodetic metrology with the aim
of meeting the requirements of customers.
ISO 17123 (all parts) provides not only a means of evaluating the precision (experimental standard deviation)
of an instrument, but also a tool for defining an uncertainty budget, which allows for the summation of all
uncertainty components, whether they are random or systematic, to a representative measure of accuracy,
i.e. the combined standard uncertainty.
ISO 17123 (all parts) therefore provides, for each instrument investigated by the procedures, a proposal
for additional, typical influence quantities, which can be expected during practical use. The customer can
estimate, for a specific application, the relevant standard uncertainty components in order to derive and
state the uncertainty of the measuring result.

v
International Standard ISO 17123-6:2025(en)
Optics and optical instruments — Field procedures for testing
geodetic and surveying instruments —
Part 6:
Rotating lasers
1 Scope
This document specifies field procedures to be adopted when determining and evaluating the precision
(repeatability) of rotating lasers, the uncertainty of measurement results obtained by geodetic instruments
and their ancillary equipment, particularly when used in building and surveying measurements for levelling
tasks. Primarily, these tests are intended to be field verifications of the suitability of a particular instrument
for the immediate task at hand and to satisfy the requirements of other standards. They are not proposed as
tests for acceptance or performance evaluations that are more comprehensive in nature.
This document can be considered as one of the first steps in the process of evaluating the uncertainty of a
measurement (more specifically a measurand). The uncertainty of a result of a measurement is dependent
on a number of parameters. Therefore, this document differentiates between various quality measures and
testing objectives, including repeatability and reproducibility (between-day repeatability), and provides a
thorough assessment of all potential error sources, as specified by ISO/IEC Guide 98-3 and ISO 17123-1.
These field procedures have been developed specifically for in situ applications without the need for special
ancillary equipment and are purposefully designed to minimize atmospheric influences.
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 3534-1, Statistics — Vocabulary and symbols — Part 1: General statistical terms and terms used in
probability
ISO 4463-1, Measurement methods for building — Setting-out and measurement — Part 1: Planning and
organization, measuring procedures, acceptance criteria
ISO 7077, Measuring methods for building — General principles and proc
...

FINAL DRAFT
International
Standard
ISO/FDIS 17123-6
ISO/TC 172/SC 6
Optics and optical instruments —
Secretariat: SNV
Field procedures for testing
Voting begins on:
geodetic and surveying
2025-04-08
instruments —
Voting terminates on:
2025-06-03
Part 6:
Rotating lasers
Optique et instruments d'optique — Méthodes d'essai sur site des
instruments géodésiques et d'observation —
Partie 6: Lasers rotatifs
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 SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 17123-6:2025(en) © ISO 2025

FINAL DRAFT
ISO/FDIS 17123-6:2025(en)
International
Standard
ISO/FDIS 17123-6
ISO/TC 172/SC 6
Optics and optical instruments —
Secretariat: SNV
Field procedures for testing
Voting begins on:
geodetic and surveying
instruments —
Voting terminates on:
Part 6:
Rotating lasers
Optique et instruments d'optique — Méthodes d'essai sur site des
instruments géodésiques et d'observation —
Partie 6: Lasers rotatifs
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 SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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 Reference number
ISO/FDIS 17123-6:2025(en) © ISO 2025

ii
ISO/FDIS 17123-6:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms. 2
4.1 Symbols .2
4.2 Abbreviations .3
5 General . 3
5.1 Requirements .3
5.2 Procedure 1: simplified test procedure .3
5.3 Procedure 2: full test procedure.4
6 Simplified test procedure . 5
6.1 Configuration of the test field .5
6.2 Measurements . .6
6.3 Calculation .6
7 Full test procedure . 7
7.1 Configuration of the test line .7
7.2 Measurements .8
7.3 Calculation .9
7.4 Statistical test . 12
7.4.1 General . 12
7.4.2 Question a) . 13
7.4.3 Question b) .14
7.4.4 Question c) .14
7.4.5 Question d) .14
8 Influence quantities and combined standard uncertainty evaluation (Type A and Type
B) . 14
Annex A (informative) Example of the simplified test procedure .16
Annex B (informative) Example of the full test procedure . 19
Annex C (informative) Example for the calculation of an uncertainty budget .26

iii
ISO/FDIS 17123-6:2025(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 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 172, Optics and photonics, Subcommittee SC 6,
Geodetic and surveying instruments.
This fourth edition cancels and replaces the third edition (ISO 17123-6:2022), which has been technically
revised.
The main changes are as follows:
— the first paragraph of Introduction has been deleted as already cited as first paragraph of the Scope;
— more flexible configuration of the test line and updating of the mathematical model;
— harmonization of terminology and symbols;
— correction of errors.
A list of all parts in the ISO 17123 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/FDIS 17123-6:2025(en)
Introduction
The definition and concept of uncertainty as a quantitative attribute to the final result of measurement was
developed mainly in the last two decades, even though error analysis has already long been a part of all
measurement sciences. After several stages, the CIPM (Comité International des Poids et Mesures) referred
the task of developing a detailed guide to ISO. Under the responsibility of the ISO Technical Advisory Group
on Metrology (TAG 4), and in conjunction with six worldwide metrology organizations, a guidance document
on the expression of measurement uncertainty was compiled with the objective of providing rules for use
within standardization, calibration, laboratory, accreditation and metrology services. ISO/IEC Guide 98-3
was first published as the Guide to the Expression of Uncertainty in Measurement (GUM) in 1995.
With the introduction of uncertainty in measurement in ISO 17123 (all parts), it is intended to finally
provide a uniform, quantitative expression of measurement uncertainty in geodetic metrology with the aim
of meeting the requirements of customers.
ISO 17123 (all parts) provides not only a means of evaluating the precision (experimental standard deviation)
of an instrument, but also a tool for defining an uncertainty budget, which allows for the summation of all
uncertainty components, whether they are random or systematic, to a representative measure of accuracy,
i.e. the combined standard uncertainty.
ISO 17123 (all parts) therefore provides, for each instrument investigated by the procedures, a proposal
for additional, typical influence quantities, which can be expected during practical use. The customer can
estimate, for a specific application, the relevant standard uncertainty components in order to derive and
state the uncertainty of the measuring result.

v
FINAL DRAFT International Standard ISO/FDIS 17123-6:2025(en)
Optics and optical instruments — Field procedures for testing
geodetic and surveying instruments —
Part 6:
Rotating lasers
1 Scope
This document specifies field procedures to be adopted when determining and evaluating the precision
(repeatability) of rotating lasers, the uncertainty of measurement results obtained by geodetic instruments
and their ancillary equipment, particularly when used in building and surveying measurements for levelling
tasks. Primarily, these tests are intended to be field verifications of the suitability of a particular instrument
for the immediate task at hand and to satisfy the re
...

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ISO/FDIS 17123-6:2025(en)
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ISO /TC 172/SC 6
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Secretariat: SNV
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Date: 2025-03-07xx
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Optics and optical instruments — Field procedures for testing
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geodetic and surveying instruments — —
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Part 6: Style Definition
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Rotating lasers
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Optique et instruments d'optique — Méthodes d'essai sur site des instruments géodésiques et d'observation
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Partie 6: Lasers rotatifs
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ISO /FDIS 17123-6:2022(E2025(en) Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
Formatted: HeaderCentered, Space After: 0 pt, Line
spacing: single
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, Commented [eXtyles1]: The reference "ISO 2025" is to a
withdrawn standard
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'sISO’s member body in the country of the requester.
Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
ISO Copyright Officecopyright office
CP 401 • Ch. de Blandonnet 8
Formatted: Adjust space between Latin and Asian text,
CH-1214 Vernier, Geneva
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Phone: + 41 22 749 01 11
Formatted: zzCopyright address, Adjust space between
Latin and Asian text, Adjust space between Asian text
Email: [e-mail]
and numbers
E-mail: [e-mail] Formatted: French (France)
Website: www.iso.orgwww.iso.org
Formatted: zzCopyright address, Adjust space between
Latin and Asian text, Adjust space between Asian text
Published in Switzerland.
and numbers
Formatted: FooterPageRomanNumber
2 © ISO 2022 – All rights reserved
ii
ISO/FDIS 17123-6:2025(en)
Formatted: Font: 11 pt, Bold
Formatted: Font: Bold
Formatted: HeaderCentered, Left
Contents
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 2
4.1 Symbols . 2
4.2 Abbreviations . 3
5 General. 3
5.1 Requirements . 3
5.2 Procedure 1: simplified test procedure . 4
5.3 Procedure 2: full test procedure . 4
6 Simplified test procedure . 6
6.1 Configuration of the test field . 6
6.2 Measurements . 7
6.3 Calculation . 7
7 Full test procedure . 8
7.1 Configuration of the test line . 8
7.2 Measurements . 9
7.3 Calculation . 10
7.4 Statistical test . 15
8 Influence quantities and combined standard uncertainty evaluation (Type A and Type B)18
Annex A (informative) Example of the simplified test procedure. 20
Annex B (informative) Example of the full test procedure . 24
Annex C (informative) Example for the calculation of an uncertainty budget . 34

Foreword . iv
Introduction . v
4.1 Symbols . 2
4.2 Abbreviations . 3
5.1 Requirements . 3
5.2 Procedure 1: simplified test procedure . 4
5.3 Procedure 2: full test procedure . 4
6.1 Configuration of the test field . 5
6.2 Measurements . 6
6.3 Calculation . 6
Formatted: Font: 10 pt
7.1 Configuration of the test line . 7
7.2 Measurements . 7
Formatted: Font: 10 pt
7.3 Calculation . 8
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7.4 Statistical test . 12
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7.4.1 General. 12
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7.4.2 Question a) . 13
7.4.3 Question b) . 13
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7.4.4 Question c) . 14
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7.4.5 Question d) . 14
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© ISO 2025 – All rights reserved
iii
ISO /FDIS 17123-6:2022(E2025(en) Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
Annex A (informative) Example of the simplified test procedure. 16
Formatted: HeaderCentered, Space After: 0 pt, Line
Annex B (informative) Example of the full test procedure . 19
spacing: single
Annex C (informative) Example for the calculation of an uncertainty budget . 26
Bibliography . 29

Formatted: FooterPageRomanNumber
4 © ISO 2022 – All rights reserved
iv
ISO/FDIS 17123-6:2025(en)
Formatted: Font: 11 pt, Bold
Formatted: Font: Bold
Formatted: HeaderCentered, Left
Foreword
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
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).
Formatted: English (United Kingdom)
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.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
Commented [eXtyles2]: The reference is to a withdrawn
standard which has been replaced
Any trade name used in this document is information given for the convenience of users and does not
ISO 17123-6:2022, Optics and optical instruments — Field
constitute an endorsement.
procedures for testing geodetic and surveying instruments —
Part 6: Rotating lasers
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
Formatted: Default Paragraph Font
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
Formatted: Default Paragraph Font
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.This document was prepared by Technical
Formatted: Default Paragraph Font
Committee ISO/TC 172, Optics and photonics, Subcommittee SC 6, Geodetic and surveying instruments.
Formatted: Adjust space
...