EN ISO 11064-6:2005
(Main)Ergonomic design of control centres - Part 6: Environmental requirements for control centres (ISO 11064-6:2005)
Ergonomic design of control centres - Part 6: Environmental requirements for control centres (ISO 11064-6:2005)
ISO 11064-6:2005 gives environmental requirements as well as recommendations for the ergonomic design, upgrading or refurbishment of control rooms and other functional areas within the control suite. The following aspects are covered: thermal environment (temperate regions); air quality; lighting environment; acoustic environment; vibration; aesthetics and interior design. It is applicable to all types of control centres, including those for the process industry, transport and dispatching systems and emergency services. Although it is primarily intended for non-mobile control centres, many of the principles are relevant to mobile centres such as those found on ships, locomotives and aircraft. It does not cover the influence of electromagnetic fields.
Ergonomische Gestaltung von Leitzentralen - Teil 6: Umgebungsbezogene Anforderungen an Leitzentralen (ISO 11064-6:2005)
ISO 11064-6 legt die umgebungsbedingten Anforderungen an die ergonomische Gestaltung, Nachrüstung oder Erneuerung von Wartenräumen und weiteren Funktionsbereichen innerhalb der Gesamtwarte fest.
Folgende Aspekte sind berücksichtigt:
- thermische Umgebung (gemäßigte Regionen);
- Luftqualität;
- Lichtverhältnisse;
- akustische Verhältnisse;
- Vibrationen;
- Ästhetik und Raumgestaltung.
Der Einfluss elektromagnetischer Felder auf den Menschen ist noch nicht ausreichend erforscht; aus diesem Grund enthält ISO 11064-6 keine besonderen Anforderungen. Leitlinien hinsichtlich des Einflusses elektromagnetischer Felder auf die Bildqualität von optischen Anzeigen sind in ISO 9241-6 angegeben.
ISO 11064-6 steht in engem Zusammenhang mit ISO 11064-2 und ISO 11064-3, in denen die Auslegung von Wartenräumen beschrieben ist. Im Hinblick auf die Gestaltung von Geräteschnittstellen, die durch Umgebungsfaktoren beeinflusst werden, bezieht sie sich außerdem auf ISO 11064-5. Planer sollten außerdem die allgemeineren umgebungsbedingten Anforderungen berücksichtigen, die mit der Anwendung von Bildschirmgeräten nach EN ISO 9241, Ergonomische Anforderungen für Bürotätigkeiten mit Bildschirmgeräten, Teile 6 und 7, zusammenhängen.
Es werden alle Arten von Leitzentralen behandelt, einschließlich derjenigen für Prozessführung, Transport- und Versandsysteme sowie Notbetrieb. Obwohl diese Internationale Norm in erster Linie für ortsfeste Leitzentralen vorgesehen ist, können viele dieser Grundsätze auch auf ortsveränderliche Leitzentralen, wie etwa von Schiffen, Lokomotiven und Flugzeugen, anwendbar sein.
Conception ergonomique des centres de commande - Partie 6: Exigences relatives à l'environnement pour les centres de commande (ISO 11064-6:2005)
L'ISO 11064-6:2005 définit des exigences relatives à l'environnement pour la conception ergonomique, la modernisation ou la rénovation des salles de commande et des autres zones fonctionnelles des annexes à la salle de commande. Les aspects suivants sont traités: l'environnement thermique (régions tempérées); la qualité de l'air; l'environnement lumineux; l'environnement acoustique; les vibrations; l'esthétique et la conception intérieure. Elle est applicable à tous les types de centres de commandes, y compris ceux destinés à l'industrie de transformation, aux transports et aux systèmes de répartition ainsi qu'aux services d'urgence. Bien qu'elle ait été conçue à l'origine pour les centres de commande non mobiles, bon nombre des principes s'appliquent également aux centres mobiles tels que ceux présents à bord des navires, des locomotives et des aéronefs. Elle ne traite pas de l'influence des champs électromagnétiques.
Ergonomsko načrtovanje krmilnih centrov – 6. del: Zahteve za delovno okolje krmilnih centrov (ISO 11064-6:2005)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2005
(UJRQRPVNRQDþUWRYDQMHNUPLOQLKFHQWURY±GHO=DKWHYH]DGHORYQRRNROMH
NUPLOQLKFHQWURY,62
Ergonomic design of control centres - Part 6: Environmental requirements for control
centres (ISO 11064-6:2005)
Ergonomische Gestaltung von Leitzentralen - Teil 6: Umgebungsbezogene
Anforderungen an Leitzentralen (ISO 11064-6:2005)
Conception ergonomique des centres de commande - Partie 6: Exigences relatives a
l'environnement pour les centres de commande (ISO 11064-6:2005)
Ta slovenski standard je istoveten z: EN ISO 11064-6:2005
ICS:
13.180 Ergonomija Ergonomics
25.040.10 9HþRSHUDFLMVNLVWURML Machining centres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 11064-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2005
ICS 13.180
English Version
Ergonomic design of control centres - Part 6: Environmental
requirements for control centres (ISO 11064-6:2005)
Conception ergonomique des centres de commande - Ergonomische Gestaltung von Leitzentralen - Teil 6:
Partie 6: Exigences relatives à l'environnement pour les Umgebungsbezogene Anforderungen an Leitzentralen (ISO
centres de commande (ISO 11064-6:2005) 11064-6:2005)
This European Standard was approved by CEN on 9 May 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11064-6:2005: E
worldwide for CEN national Members.
Foreword
This document (EN ISO 11064-6:2005) has been prepared by Technical Committee ISO/TC 159
"Ergonomics" in collaboration with Technical Committee CEN/TC 122 "Ergonomics", the
secretariat of which is held by DIN.
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 January 2006, and conflicting national
standards shall be withdrawn at the latest by January 2006.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 11064-6:2005 has been approved by CEN as EN ISO 11064-6:2005 without any
modifications.
INTERNATIONAL ISO
STANDARD 11064-6
First edition
2005-07-01
Ergonomic design of control centres —
Part 6:
Environmental requirements for control
centres
Conception ergonomique des centres de commande —
Partie 6: Exigences relatives à l'environnement pour les centres de
commande
Reference number
ISO 11064-6:2005(E)
©
ISO 2005
ISO 11064-6:2005(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2005
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2005 – All rights reserved
ISO 11064-6:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 General principles for environmental design . 5
5 Requirements and recommendations .7
5.1 Ergonomic aspects and thermal conditions. 7
5.2 Ergonomics and air quality. 8
5.3 Ergonomics and lighting. 9
5.4 Ergonomics and acoustics . 12
5.5 Ergonomics and vibration . 14
5.6 Ergonomics and interior design and aesthetics . 15
Annex A (informative) Recommendations for environmental design. 17
Bibliography . 20
ISO 11064-6:2005(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 11064-6 was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 4,
Ergonomics of human-system interaction.
ISO 11064 consists of the following parts, under the general title Ergonomic design of control centres:
Part 1: Principles for the design of control centres
Part 2: Principles for the arrangement of control suites
Part 3: Control room layout
Part 4: Layout and dimensions of workstations
Part 6: Environmental requirements for control centres
Part 7: Principles for the evaluation of control centres
iv © ISO 2005 – All rights reserved
ISO 11064-6:2005(E)
Introduction
The environmental aspects associated with the design of man–machine systems need to be addressed, since
poor environments can seriously affect operator performance. In control rooms, these environmental factors
include lighting, humidity, temperature, vibration and noise. These factors also need to take account of shift
work, real-time operations under time pressure and the specialised equipment used in control rooms.
In this part of ISO 11064, environmental requirements are presented which optimize work conditions in such a
way that safety is ensured, health is not impaired and the efficiency of control room operators is promoted.
The degree of specificity of this standard does not extend to national and local requirements, which can vary
between countries and/or regions. In such cases, experts in the relevant areas (human factors and
ergonomics, lighting, acoustics, thermal environment, etc.) will need to be consulted. For specific values on
environmental variables, see Annex A and/or consult local and/or national standards for the relevant country
or region.
INTERNATIONAL STANDARD ISO 11064-6:2005(E)
Ergonomic design of control centres —
Part 6:
Environmental requirements for control centres
1 Scope
This part of ISO 11064 gives environmental requirements as well as recommendations for the ergonomic
design, upgrading or refurbishment of control rooms and other functional areas within the control suite.
The following aspects are covered:
thermal environment (temperate regions);
air quality;
lighting environment;
acoustic environment;
vibration;
aesthetics and interior design.
It is applicable to all types of control centres, including those for the process industry, transport and
dispatching systems and emergency services. Although primarily intended for non-mobile control centres,
many of its principles are relevant to mobile centres such as those found on ships, locomotives and aircraft.
It does not cover the influence of electromagnetic fields. Guidance on the influence of electromagnetic fields
on the image quality of visual displays is given in ISO 9241-6.
This part of ISO 11064 is closely connected with ISO 11064-2 and ISO 11064-3, which describe the control
room layout. It also relates to the design of equipment interfaces, which are influenced by environmental
factors. It would be prudent for designers to also take account of the more general environmental
requirements associated with display screen equipment use presented in ISO 9241-6 and ISO 9241-7.
2 Normative references
The following referenced documents are indispensable for the application 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 7731, Ergonomics — Danger signals for public and work areas — Auditory danger signals
ISO 7779, Acoustics — Measurement of airborne noise emitted by information technology and
telecommunications equipment
ISO/CIE 8995, Lighting of indoor work places
ISO 11064-6:2005(E)
ISO 9241-6, Ergonomic requirements for office work with visual display terminals (VDTs) — Part 6: Guidance
on the work environment
ISO 13731, Ergonomics of the thermal environment — Vocabulary and symbols
IEC 60651, Sound level meters — Electromagnetic and electrostatic compatibility and test procedures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
A-weighted sound pressure level
sound level
logarithm to the base 10 of the ratio of a given sound pressure to the reference sound pressure of 20 µPa, the
sound pressure being obtained with a standard frequency weighting and with standard exponentially weighted
time-averaging
NOTE The sound level in decibels is twenty times the logarithm to the base ten of that ratio.
[IEC 60651]
3.2
air velocity
v
a
average of the effective velocity of the air, i.e. the magnitude of the velocity vector of the flow at the measuring
point considered, over an interval of time (measuring period), expressed in metres per second
3.3
brightness
attribute of a visual sensation associated with
...
SLOVENSKI STANDARD
01-november-2005
Ergonomsko načrtovanje krmilnih centrov – 6. del: Zahteve za delovno okolje
krmilnih centrov (ISO 11064-6:2005)
Ergonomic design of control centres - Part 6: Environmental requirements for control
centres (ISO 11064-6:2005)
Ergonomische Gestaltung von Leitzentralen - Teil 6: Umgebungsbezogene
Anforderungen an Leitzentralen (ISO 11064-6:2005)
Conception ergonomique des centres de commande - Partie 6: Exigences relatives a
l'environnement pour les centres de commande (ISO 11064-6:2005)
Ta slovenski standard je istoveten z: EN ISO 11064-6:2005
ICS:
13.180 Ergonomija Ergonomics
25.040.10 Večoperacijski stroji Machining centres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 11064-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2005
ICS 13.180
English Version
Ergonomic design of control centres - Part 6: Environmental
requirements for control centres (ISO 11064-6:2005)
Conception ergonomique des centres de commande - Ergonomische Gestaltung von Leitzentralen - Teil 6:
Partie 6: Exigences relatives à l'environnement pour les Umgebungsbezogene Anforderungen an Leitzentralen (ISO
centres de commande (ISO 11064-6:2005) 11064-6:2005)
This European Standard was approved by CEN on 9 May 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11064-6:2005: E
worldwide for CEN national Members.
Foreword
This document (EN ISO 11064-6:2005) has been prepared by Technical Committee ISO/TC 159
"Ergonomics" in collaboration with Technical Committee CEN/TC 122 "Ergonomics", the
secretariat of which is held by DIN.
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 January 2006, and conflicting national
standards shall be withdrawn at the latest by January 2006.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 11064-6:2005 has been approved by CEN as EN ISO 11064-6:2005 without any
modifications.
INTERNATIONAL ISO
STANDARD 11064-6
First edition
2005-07-01
Ergonomic design of control centres —
Part 6:
Environmental requirements for control
centres
Conception ergonomique des centres de commande —
Partie 6: Exigences relatives à l'environnement pour les centres de
commande
Reference number
ISO 11064-6:2005(E)
©
ISO 2005
ISO 11064-6:2005(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2005
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2005 – All rights reserved
ISO 11064-6:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 General principles for environmental design . 5
5 Requirements and recommendations .7
5.1 Ergonomic aspects and thermal conditions. 7
5.2 Ergonomics and air quality. 8
5.3 Ergonomics and lighting. 9
5.4 Ergonomics and acoustics . 12
5.5 Ergonomics and vibration . 14
5.6 Ergonomics and interior design and aesthetics . 15
Annex A (informative) Recommendations for environmental design. 17
Bibliography . 20
ISO 11064-6:2005(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 11064-6 was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 4,
Ergonomics of human-system interaction.
ISO 11064 consists of the following parts, under the general title Ergonomic design of control centres:
Part 1: Principles for the design of control centres
Part 2: Principles for the arrangement of control suites
Part 3: Control room layout
Part 4: Layout and dimensions of workstations
Part 6: Environmental requirements for control centres
Part 7: Principles for the evaluation of control centres
iv © ISO 2005 – All rights reserved
ISO 11064-6:2005(E)
Introduction
The environmental aspects associated with the design of man–machine systems need to be addressed, since
poor environments can seriously affect operator performance. In control rooms, these environmental factors
include lighting, humidity, temperature, vibration and noise. These factors also need to take account of shift
work, real-time operations under time pressure and the specialised equipment used in control rooms.
In this part of ISO 11064, environmental requirements are presented which optimize work conditions in such a
way that safety is ensured, health is not impaired and the efficiency of control room operators is promoted.
The degree of specificity of this standard does not extend to national and local requirements, which can vary
between countries and/or regions. In such cases, experts in the relevant areas (human factors and
ergonomics, lighting, acoustics, thermal environment, etc.) will need to be consulted. For specific values on
environmental variables, see Annex A and/or consult local and/or national standards for the relevant country
or region.
INTERNATIONAL STANDARD ISO 11064-6:2005(E)
Ergonomic design of control centres —
Part 6:
Environmental requirements for control centres
1 Scope
This part of ISO 11064 gives environmental requirements as well as recommendations for the ergonomic
design, upgrading or refurbishment of control rooms and other functional areas within the control suite.
The following aspects are covered:
thermal environment (temperate regions);
air quality;
lighting environment;
acoustic environment;
vibration;
aesthetics and interior design.
It is applicable to all types of control centres, including those for the process industry, transport and
dispatching systems and emergency services. Although primarily intended for non-mobile control centres,
many of its principles are relevant to mobile centres such as those found on ships, locomotives and aircraft.
It does not cover the influence of electromagnetic fields. Guidance on the influence of electromagnetic fields
on the image quality of visual displays is given in ISO 9241-6.
This part of ISO 11064 is closely connected with ISO 11064-2 and ISO 11064-3, which describe the control
room layout. It also relates to the design of equipment interfaces, which are influenced by environmental
factors. It would be prudent for designers to also take account of the more general environmental
requirements associated with display screen equipment use presented in ISO 9241-6 and ISO 9241-7.
2 Normative references
The following referenced documents are indispensable for the application 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 7731, Ergonomics — Danger signals for public and work areas — Auditory danger signals
ISO 7779, Acoustics — Measurement of airborne noise emitted by information technology and
telecommunications equipment
ISO/CIE 8995, Lighting of indoor work places
ISO 11064-6:2005(E)
ISO 9241-6, Ergonomic requirements for office work with visual display terminals (VDTs) — Part 6: Guidance
on the work environment
ISO 13731, Ergonomics of the thermal environment — Vocabulary and symbols
IEC 60651, Sound level meters — Electromagnetic and electrostatic compatibility and test procedures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
A-weighted sound pressure level
sound level
logarithm to the base 10 of the ratio of a given sound pressure to the reference sound pressure of 20 µPa, the
sound pressure being obtained with a standard frequency weighting and with standard exponentially weighted
time-averaging
NOTE The sound level in decibels is twenty times the logarithm to the base ten of that ratio.
[IEC 60651]
3.2
air velocity
v
a
average of the effective velocity of the air, i.e. the magnitude of the velocity vector of the flow at the measuring
point considered, over an interval of time (measuring period), expressed in metres per second
3.3
brightness
attribute of a visual sensation associated with the amount of light
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.