ISO 6358-1:2013/FDAmd 2
(Amendment)Pneumatic fluid power — Determination of flow-rate characteristics of components using compressible fluids — Part 1: General rules and test methods for steady-state flow — Amendment 2: Evaluation of measurement uncertainty
Pneumatic fluid power — Determination of flow-rate characteristics of components using compressible fluids — Part 1: General rules and test methods for steady-state flow — Amendment 2: Evaluation of measurement uncertainty
Transmissions pneumatiques — Détermination des caractéristiques de débit des composants traversés par un fluide compressible — Partie 1: Règles générales et méthodes d'essai en régime stationnaire — Amendement 2: Évaluation de l'incertitude de mesure
General Information
- Status
- Not Published
- Technical Committee
- ISO/TC 131/SC 5 - Control products and components
- Drafting Committee
- ISO/TC 131/SC 5/WG 3 - Pneumatic control products
- Current Stage
- 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
- Start Date
- 26-Jan-2026
- Completion Date
- 26-Jan-2026
Relations
- Effective Date
- 28-Oct-2023
Overview
ISO 6358-1:2013/FDAmd 2:2025 is an important amendment to the international standard for pneumatic fluid power systems, focusing on the determination of flow-rate characteristics of components using compressible fluids. Specifically, it updates Part 1 of the standard, which covers general rules and test methods for steady-state flow, by introducing a detailed evaluation of measurement uncertainty. Developed by ISO Technical Committee ISO/TC 131/SC 5, this amendment enhances the precision and reliability of flow-rate measurement methods essential for pneumatic components.
The standard provides practitioners and engineers with the latest guidance for accurately determining sonic conductance, critical back-pressure ratios, and subsonic flow indices, along with methods to rigorously estimate uncertainties. This ensures assays remain fit for purpose, supporting high-quality measurements in pneumatic fluid power applications.
Key Topics
Measurement Uncertainty Evaluation
The amendment incorporates the ISO/IEC Guide 98-3 (GUM) consensus method for estimating measurement uncertainty, emphasizing a practical approach "fit for purpose." Both Type A (statistical analysis of repeated measurements) and Type B (other sources like calibration certificates or environmental factors) uncertainties are combined using the law of propagation of uncertainty.Sonic Conductance Calculation (C)
Sonic conductance is a central flow-rate characteristic. It is determined from experimental data in the choked flow region via defined formulas, with an updated method for calculating the combined standard uncertainty accounting for flow, temperature, and pressure variations.Critical Back-Pressure Ratio (b) and Subsonic Index (m)
These parameters describe flow behavior and are computed using nonlinear least squares (NLLSQ) regression. The amendment proposes pragmatic uncertainty evaluation for these indirectly calculated values based on variability in sonic conductance.Measurement Bias Considerations
The document provides maximum bias estimates on the sonic conductance caused by stagnation pressure measurement errors linked to different sizes of transition connectors, an essential factor to minimize flow measurement inaccuracies.
Applications
ISO 6358-1:2013/FDAmd 2 is vital for industries relying on pneumatic systems and components where precise flow characterization and reliable data are critical:
Pneumatic Component Testing
Manufacturers and testing laboratories use this standard to verify flow performance and consistency in valves, cylinders, and other pneumatic devices under steady-state conditions.Quality Control and Calibration
Ensuring measurement uncertainty is accurately evaluated supports rigorous quality control processes, improving traceability and compliance with international testing norms.Design and Development
Engineers designing pneumatic control systems rely on detailed flow-rate data to optimize component selection and system performance.Research and Development
The amendment’s detailed uncertainty framework supports accurate scientific investigations into fluid power behavior involving compressible gases.
Related Standards
ISO/IEC Guide 98-3 (GUM:1995)
Provides the foundational methodology for evaluating measurement uncertainty universally applied in this amendment.ISO 6358 Series
The overall series covers pneumatic fluid power systems, with additional parts addressing unsteady flow conditions and expanded testing methods.ISO/TC 131 Fluid Power Standards
Complementary standards within this technical committee also address hydraulic and pneumatic system components, ensuring consistency across fluid power technologies.
This amendment underscores the commitment of ISO and the fluid power community to advancing standardized measurement procedures that enable enhanced accuracy, reliability, and interoperability in pneumatic fluid power systems worldwide. Implementing ISO 6358-1:2013/FDAmd 2 supports professionals in achieving authoritative flow measurement results with well-characterized uncertainties.
ISO 6358-1:2013/FDAmd 2 - Pneumatic fluid power — Determination of flow-rate characteristics of components using compressible fluids — Part 1: General rules and test methods for steady-state flow — Amendment 2: Evaluation of measurement uncertainty Released:12. 01. 2026
REDLINE ISO 6358-1:2013/FDAmd 2 - Pneumatic fluid power — Determination of flow-rate characteristics of components using compressible fluids — Part 1: General rules and test methods for steady-state flow — Amendment 2: Evaluation of measurement uncertainty Released:12. 01. 2026
ISO 6358-1:2013/FDAmd 2 - Transmissions pneumatiques — Détermination des caractéristiques de débit des composants traversés par un fluide compressible — Partie 1: Règles générales et méthodes d'essai en régime stationnaire — Amendement 2: Évaluation de l'incertitude de mesure Released:4. 02. 2026
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Frequently Asked Questions
ISO 6358-1:2013/FDAmd 2 is a draft published by the International Organization for Standardization (ISO). Its full title is "Pneumatic fluid power — Determination of flow-rate characteristics of components using compressible fluids — Part 1: General rules and test methods for steady-state flow — Amendment 2: Evaluation of measurement uncertainty". This standard covers: Pneumatic fluid power — Determination of flow-rate characteristics of components using compressible fluids — Part 1: General rules and test methods for steady-state flow — Amendment 2: Evaluation of measurement uncertainty
Pneumatic fluid power — Determination of flow-rate characteristics of components using compressible fluids — Part 1: General rules and test methods for steady-state flow — Amendment 2: Evaluation of measurement uncertainty
ISO 6358-1:2013/FDAmd 2 is classified under the following ICS (International Classification for Standards) categories: 23.100.01 - Fluid power systems in general. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 6358-1:2013/FDAmd 2 has the following relationships with other standards: It is inter standard links to ISO 6358-1:2013. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 6358-1:2013/FDAmd 2 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
FINAL DRAFT
Amendment
ISO 6358-1:2013/
FDAM 2
ISO/TC 131/SC 5
Pneumatic fluid power —
Secretariat: AFNOR
Determination of flow-rate
Voting begins on:
characteristics of components using
2026-01-26
compressible fluids —
Voting terminates on:
2026-03-23
Part 1:
General rules and test methods for
steady-state flow
AMENDMENT 2: Evaluation of
measurement uncertainty
Transmissions pneumatiques — Détermination des
caractéristiques de débit des composants traversés par un fluide
compressible —
Partie 1: Règles générales et méthodes d'essai en régime
stationnaire
AMENDEMENT 2: Évaluation de l'incertitude de mesure
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 6358-1:2013/FDAM 2:2026(en) © ISO 2026
FINAL DRAFT
ISO 6358-1:2013/FDAM 2:2026(en)
Amendment
ISO 6358-1:2013/
FDAM 2
ISO/TC 131/SC 5
Pneumatic fluid power —
Secretariat: AFNOR
Determination of flow-rate
Voting begins on:
characteristics of components using
compressible fluids —
Voting terminates on:
Part 1:
General rules and test methods for
steady-state flow
AMENDMENT 2: Evaluation of
measurement uncertainty
Transmissions pneumatiques — Détermination des
caractéristiques de débit des composants traversés par un fluide
compressible —
Partie 1: Règles générales et méthodes d'essai en régime
stationnaire
AMENDEMENT 2: Évaluation de l'incertitude de mesure
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 2026
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO 6358-1:2013/FDAM 2:2026(en) © ISO 2026
ii
ISO 6358-1:2013/FDAM 2:2026(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.
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 131, Fluid power systems, Subcommittee SC 5,
Control products and components.
A list of all parts in the ISO 6358 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.
iii
ISO 6358-1:2013/FDAM 2:2026(en)
Pneumatic fluid power — Determination of flow-rate
characteristics of components using compressible fluids —
Part 1:
General rules and test methods for steady-state flow
AMENDMENT 2: Evaluation of measurement uncertainty
Annex C
Replace Annex C to update the method of calculation of the measurement uncertainty of the sonic
conductance.
ISO 6358-1:2013/FDAM 2:2026(en)
Annex C
(informative)
Evaluation of measurement uncertainty
C.1 General
The ISO Guide on uncertainty in measurement [ISO/IEC Guide 98-3:2008 (GUM:1995)] provides the
current international consensus method for estimating measurement uncertainty. There are different
ways to estimate measurement uncertainty; the strict mathematical way is described most extensively in
ISO/IEC Guide 98-3, but the other pragmatic methods that are compliant with ISO/IEC Guide 98-3 can be
used. The main rule appears as follows: effort and expenditure for determination of uncertainties are clearly
guided by the principle “fit for purpose”, i.e. effort and expenditure for determination of uncertainties are up
to standards to meet the requirements set by the user of the measurement data, but it is not over qualitative
in light of the application. This annex uses this principle.
ISO/IEC Guide 98-3 groups uncertainty components into Type A and Type B according to the way data
were obtained. Type A components are calculated by statistical means from repeated measurements, while
Type B components are taken from other sources, e.g. reference material, calibration certificates, accepted
values of constants, resolution, instability, environmental conditions.
In practice, however, a combined approach is most of the time considered as the most suitable. This combined
approach will apply very often, as each uncertainty cannot be estimated individually. In this case, Type B
will be used with reference materials and quality control materials to avoid some systematic measuring
error. The single uncertainties are combined applying th
...
ISO 6358-1:2013/FDAMFDAmd 2:2025(en)
ISO/TC 131/SC 5
Date: 2025-12-27
Secretariat: AFNOR
Date: 2026-xx
Pneumatic fluid power — Determination of flow-rate characteristics
of components using compressible fluids — —
Part 1:
General rules and test methods for steady-state flow —
AMENDMENT 2: Evaluation of measurement uncertainty
Transmissions pneumatiques — Détermination des caractéristiques de débit des composants traversés par un
fluide compressible — —
Partie 1: Règles générales et méthodes d'essai en régime stationnaire — Amendement
AMENDEMENT 2: Évaluation de l'incertitude de mesure
FDIS stage
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
EmailE-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
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.
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 131, Fluid power systems, Subcommittee SC 5,
Control products and components.
A list of all parts in the ISO 6358 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.
iii
Pneumatic fluid power — Determination of flow-rate characteristics
of components using compressible fluids
—
Part 1:
General rules and test methods for steady-state flow
AMENDMENT 2: Evaluation of measurement uncertainty
Annex C
Replace Annex C to update the method of calculation of the measurement uncertainty of the sonic
conductance.
Annex C
(informative)
Evaluation of measurement uncertainty
C.1 General
The ISO Guide on uncertainty in measurement ([ISO/IEC Guide 98-3:2008- (GUM:1995))] provides the
current international consensus method for estimating measurement uncertainty. There are different ways to
estimate measurement uncertainty; the strict mathematical way is described most extensively in the
GUMISO/IEC Guide 98-3, but the other pragmatic methods that are compliant with GUMISO/IEC Guide 98-3
can be used. The main rule appears as follows: effort and expenditure for determination of uncertainties are
clearly guided by the principle “fit for purpose”, i.e. effort and expenditure for determination of uncertainties
are up to standards to meet the requirements set by the user of the measurement data, but it is not over
qualitative in light of the application. This annex uses this principle.
GUMISO/IEC Guide 98-3 groups uncertainty components into Type A and Type B according to the way data
were obtained. Type A components are calculated by statistical means from repeated measurements, while
Type B components are taken from other sources, e.g. reference material, calibration certificates, accepted
values of constants, resolution, instability, environmental conditions.
In practice, however, a combined approach is most of the time considered as the most suitable. This combined
approach will apply very often, as each uncertainty cannot be estimated individually. In this case, Type B will
be used with reference materials and quality control materials to avoid some systematic measuring error. The
single uncertainties are combined applying the law of propagation of uncertainty. The Type A uncertainty
estimate is an estimate derived from the statistical analysis of experimental data. This type of uncertainty
evaluation is preferred when the value of a measurand will be the average of several test results or is in
relation with non-independent variables.
C.2 Measurement uncertainties
The measurement uncertainty of the instrumentation used to determine the flow characteristic parameters
do not exceed the values given in Table 9.
C.3 Evaluation of measurement uncertainty of the sonic conductance, C
According to this document, the most important flow-rate characteristic parameter of a pneumatic component
is the sonic conductance, C, which is calculated according to 6.3.1.1 in two steps (see Figure C.1):
∗ ∗ ∗
— — determina
...
PROJET FINAL
Amendement
ISO 6358-1:2013/
FDAM 2
ISO/TC 131/SC 5
Transmissions pneumatiques —
Secrétariat: AFNOR
Détermination des caractéristiques
Début de vote:
de débit des composants traversés
2026-01-26
par un fluide compressible —
Vote clos le:
2026-03-23
Partie 1:
Règles générales et méthodes
d'essai en régime stationnaire
AMENDEMENT 2: Évaluation de
l'incertitude de mesure
Pneumatic fluid power — Determination of flow-rate
characteristics of components using compressible fluids —
Part 1: General rules and test methods for steady-state flow
AMENDMENT 2: Evaluation of measurement uncertainty
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
PROJETS DE NORMES
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
NORMES POUVANT
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
Numéro de référence
ISO 6358-1:2013/FDAM 2:2026(fr) © ISO 2026
PROJET FINAL
ISO 6358-1:2013/FDAM 2:2026(fr)
Amendement
ISO 6358-1:2013/
FDAM 2
ISO/TC 131/SC 5
Transmissions pneumatiques —
Secrétariat: AFNOR
Détermination des caractéristiques
Début de vote:
de débit des composants traversés
2026-01-26
par un fluide compressible —
Vote clos le:
2026-03-23
Partie 1:
Règles générales et méthodes
d'essai en régime stationnaire
AMENDEMENT 2: Évaluation de
l'incertitude de mesure
Pneumatic fluid power — Determination of flow-rate
characteristics of components using compressible fluids —
Part 1: General rules and test methods for steady-state flow
AMENDMENT 2: Evaluation of measurement uncertainty
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
DOCUMENT PROTÉGÉ PAR COPYRIGHT
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
© ISO 2026 INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
PROJETS DE NORMES
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
NORMES POUVANT
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse Numéro de référence
ISO 6358-1:2013/FDAM 2:2026(fr) © ISO 2026
ii
ISO 6358-1:2013/FDAM 2:2026(fr)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a
été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
www.iso.org/directives).
L’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L’ISO ne prend pas position quant à la preuve, à la validité et à l’applicabilité de
tout droit de brevet revendiqué à cet égard. À la date de publication du présent document, l’ISO n'avait pas
reçu notification qu’un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d’avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l'adresse
www.iso.org/brevets. L’ISO ne saurait être tenue pour responsable de ne pas avoir identifié tout ou partie de
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l'ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voir www.iso.org/avant-propos.
Le présent document a été élaboré par le comité technique ISO/TC 131, Transmissions hydrauliques et
pneumatiques, sous-comité SC 5, Appareils de régulation et de distribution et leurs composants.
Une liste de toutes les parties de la série ISO 6358 se trouve sur le site web de l’ISO.
Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent
document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes se
trouve à l’adresse www.iso.org/fr/members.html.
Annexe C
Remplacer l'Annexe C afin de mettre à jour la méthode de calcul de l'incertitude de mesure de la conductance
sonique.
iii
ISO 6358-1:2013/FDAM 2:2026(fr)
Transmissions pneumatiques — Détermination des
caractéristiques de débit des composants traversés par un
fluide compressible —
Partie 1:
Règles générales et méthodes d'essai en régime stationnaire
AMENDEMENT 2: Évaluation de l'incertitude de mesure
ISO 6358-1:2013/FDAM 2:2026(fr)
Annexe C
(informative)
Évaluation de l'incertitude de mesure
C.1 Généralités
Le Guide ISO pour l'incertitude de mesure [Guide ISO/CEI 98-3:2008 (GUM:1995)] indique la méthode
ayant actuellement recueilli un consensus international pour estimer l'incertitude de mesure. Il existe
différentes possibilités pour estimer l'incertitude de mesure: la méthode mathématique stricte est décrite
de manière plus approfondie dans le Guide ISO/CEI 98-3, cependant, on peut utiliser les autres méthodes
pragmatiques conformes au Guide ISO/CEI 98-3. La règle la plus importante est la suivante: les efforts et les
coûts de détermination des incertitudes sont clairement guidés par le principe «d'adaptation aux besoins»,
c'est-à-dire les efforts et les coûts de détermination des incertitudes sont à la mesure des exigences fixées
par l'utilisateur des données de mesure, mais ils ne sont pas excessifs vis-à-vis de l'application. La présente
Annexe utilise ce principe.
Le Guide ISO/CEI 98-3 regroupe les composantes d'incertitude de Type A et de Type B en fonction de la façon
dont elles ont été obtenues. Les composantes de Type A sont calculées par des moyens statistiques d'après
des mesures répétées, tandis que les composantes de Type B proviennent d'autres sources, par exemple
un matériau de référence, des certificats d'étalonnage, des valeurs acceptées de constantes, la résolution,
l'instabilité, les conditions environnementales.
Dans la pratique, une approche c
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