SIST EN ISO 9241-305:2009

SLOVENSKI STANDARD
SIST EN ISO 9241-305:2009
01-januar-2009
(UJRQRPLMDPHGVHERMQHJDYSOLYDþORYHNVLVWHPGHO/DERUDWRULMVNHRSWLþQH
SUHVNXVQHPHWRGH]DHOHNWURQVNHVOLNRYQH]DVORQH,62
Ergonomics of human-system interaction - Part 305: Optical laboratory test methods for
electronic visual displays (ISO 9241-305:2008)
Ergonomie der Mensch-System-Interaktion - Teil 305: Optische Laborprüfverfahren für
elektronische optische Anzeigen (ISO 9241-305:2008)
Ergonomie de l'interaction homme-systeme - Partie 305: Méthodes d'essai de laboratoire
optique pour écrans visuels électroniques (ISO 9241-305:2008)
Ta slovenski standard je istoveten z: EN ISO 9241-305:2008
ICS:
13.180 Ergonomija Ergonomics
35.180 Terminalska in druga IT Terminal and other
periferna oprema IT peripheral equipment
SIST EN ISO 9241-305:2009 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 9241-305:2009

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SIST EN ISO 9241-305:2009
EUROPEAN STANDARD
EN ISO 9241-305
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2008
ICS 13.180; 35.180

English Version
Ergonomics of human-system interaction - Part 305: Optical
laboratory test methods for electronic visual displays (ISO 9241-
305:2008)
Ergonomie de l'interaction homme-système - Partie 305: Ergonomie der Mensch-System-Interaktion - Teil 305:
Méthodes d'essai de laboratoire optique pour écrans de Optische Laborprüfverfahren für elektronische optische
visualisation électroniques (ISO 9241-305:2008) Anzeigen (ISO 9241-305:2008)
This European Standard was approved by CEN on 1 November 2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, 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
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9241-305:2008: E
worldwide for CEN national Members.

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SIST EN ISO 9241-305:2009
EN ISO 9241-305:2008 (E)
Contents Page
Foreword .3

2

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SIST EN ISO 9241-305:2009
EN ISO 9241-305:2008 (E)
Foreword
This document (EN ISO 9241-305:2008) 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 May 2009, and conflicting national standards shall be withdrawn at the
latest by May 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 9241-305:2008 has been approved by CEN as a EN ISO 9241-305:2008 without any
modification.

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SIST EN ISO 9241-305:2009

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SIST EN ISO 9241-305:2009

INTERNATIONAL ISO
STANDARD 9241-305
First edition
2008-11-15


Ergonomics of human-system
interaction —
Part 305:
Optical laboratory test methods
for electronic visual displays
Ergonomie de l'interaction homme-système —
Partie 305: Méthodes d'essai de laboratoire optique pour écrans
de visualisation électroniques





Reference number
ISO 9241-305:2008(E)
©
ISO 2008

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SIST EN ISO 9241-305:2009
ISO 9241-305:2008(E)
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All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
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ii © ISO 2008 – All rights reserved

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SIST EN ISO 9241-305:2009
ISO 9241-305:2008(E)
Contents Page
Foreword .iv
Introduction.vi
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 General .1
4.1 Measurements — Basic measurements and derived procedures .1
4.2 Structure.2
4.3 Matrix of measurement conditions methods and procedures.2
5 Measurement conditions .2
5.1 Preparations and procedures .2
5.2 Test accessories.7
5.3 Test patterns .13
5.4 Alignment — Measurement location and meter position.25
5.5 Light measuring device (LMD) .28
5.6 Measurement field .30
5.7 Angular aperture.30
5.8 Meter time response.31
5.9 Test illumination .31
5.10 Other ambient test conditions.43
6 Measurement methods .44
6.1 Basic light measurements.44
6.2 Luminance profile measurements .52
6.3 Directional light measurements.54
6.4 Temporal performance measurements .56
6.5 Reflection measurements.72
6.6 Luminance analysis .85
6.7 Contrast analysis.94
6.8 Colour analysis.105
6.9 Dimensions and geometries .113
6.10 Geometrics and defects.127
6.11 Alignment of virtual image displays.145
7 Conformance .159
Annex A (informative) Overview of the ISO 9241 series .160
Annex B (informative) Guidelines for measurement method types.164
Annex C (informative) Matrix of measurement procedures and their sources .166
Annex D (informative) Bidirectional reflectance distribution function (BRDF) .175
Annex E (informative) Uncertainty analysis guidelines .177
Annex F (informative) Reconstruction of luminance distribution by microstepping .182
Bibliography.183

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SIST EN ISO 9241-305:2009
ISO 9241-305:2008(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 9241-305 was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 4,
Ergonomics of human-system interaction.
This first edition of ISO 9241-305, together with ISO 9241-302, cancels and replaces ISO 13406-1:1999 and
ISO 9241-8:1997. Together with ISO 9241-302, ISO 9241-303 and ISO 9241-307, it also cancels and
replaces ISO 9241-7:1998 and ISO 13406-2:2001, and partially replaces ISO 9241-3:1992. The following has
been technically revised:
⎯ terms and definitions related to electronic visual displays have been transferred to, and collected in,
ISO 9241-302;
⎯ while the areas previously covered in ISO 9241 and by ISO 13406 remain essentially unchanged, test
methods and requirements have been updated to account for advances in science and technology;
⎯ all generic ergonomic requirements have been incorporated into ISO 9241-303;
⎯ the application of those requirements to different display technologies, application areas and
environmental conditions — including test methods and pass/fail criteria — is specified in
ISO 9241-307;
⎯ methods for the laboratory testing of those requirements are specified in ISO 9241-305.
ISO 9241 consists of the following parts, under the general title Ergonomic requirements for office work with
visual display terminals (VDTs):
⎯ Part 1: General introduction
⎯ Part 2: Guidance on task requirements
⎯ Part 4: Keyboard requirements
⎯ Part 5: Workstation layout and postural requirements
⎯ Part 6: Guidance on the work environment
⎯ Part 9: Requirements for non-keyboard input devices
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SIST EN ISO 9241-305:2009
ISO 9241-305:2008(E)
⎯ Part 11: Guidance on usability
⎯ Part 12: Presentation of information
⎯ Part 13: User guidance
⎯ Part 14: Menu dialogues
⎯ Part 15: Command dialogues
⎯ Part 16: Direct manipulation dialogues
⎯ Part 17: Form filling dialogues
ISO 9241 also consists of the following parts, under the general title Ergonomics of human-system interaction:
⎯ Part 20: Accessibility guidelines for information/communication technology (ICT) equipment and services
⎯ Part 110: Dialogue principles
⎯ Part 151: Guidance on World Wide Web user interfaces
⎯ Part 171: Guidance on software accessibility
⎯ Part 300: Introduction to electronic visual display requirements
⎯ Part 302: Terminology for electronic visual displays
⎯ Part 303: Requirements for electronic visual displays
⎯ Part 304: User performance test methods for electronic visual displays
⎯ Part 305: Optical laboratory test methods for electronic visual displays
⎯ Part 306: Field assessment methods for electronic visual displays
⎯ Part 307: Analysis and compliance test methods for electronic visual displays
⎯ Part 308: Surface-conduction electron-emitter displays (SED) [Technical Report]
⎯ Part 309: Organic light-emitting diode (OLED) displays [Technical Report]
⎯ Part 400: Principles and requirements for physical input devices
⎯ Part 410: Design criteria for physical input devices
⎯ Part 920: Guidance on tactile and haptic interactions
For the other parts under preparation, see Annex A.
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SIST EN ISO 9241-305:2009
ISO 9241-305:2008(E)
Introduction
This part of ISO 9241 was prepared with the support of the flat panel display measurements (FPDM) task
[10]
group of VESA (Video Electronics Standards Association, USA). Contributions from its FPDM standard are
identified in Annex C.
The methods specified in this part of ISO 9241 are provided to assist test laboratories (either suppliers’
facilities or test institutes) in deciding whether a specific electronic display conforms to the other relevant parts
of ISO 9241, insofar as such a decision can be made in a laboratory setting. This part of ISO 9241 does not
specify how to select display adjustment parameters or software for making a test representative of intended
actual use. That judgement has to be made by the test laboratory and described in the test report.
ISO 9241 was originally developed as a seventeen-part International Standard on the ergonomics
requirements for office work with visual display terminals. As part of the standards review process, a major
restructuring of ISO 9241 was agreed to broaden its scope, to incorporate other relevant standards and to
make it more usable. The general title of the revised ISO 9241, “Ergonomics of human-system interaction”,
reflects these changes and aligns the standard with the overall title and scope of Technical Committee
ISO/TC 159, Ergonomics, Subcommittee SC 4, Ergonomics of human-system interaction. The revised
multipart standard is structured as series of standards numbered in the “hundreds”: the 100 series deals with
software interfaces, the 200 series with human centred design, the 300 series with visual displays, the 400
series with physical input devices, and so on.
See Annex A for an overview of the entire ISO 9241 series.

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SIST EN ISO 9241-305:2009
INTERNATIONAL STANDARD ISO 9241-305:2008(E)

Ergonomics of human-system interaction —
Part 305:
Optical laboratory test methods for electronic visual displays
1 Scope
This part of ISO 9241 establishes optical test and expert observation methods for use in predicting the
performance of a display vis-à-vis the ergonomics requirements given in ISO 9241-303.
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 9241-302, Ergonomics of human-system interaction — Part 302: Terminology for electronic visual
displays
ISO 9241-303, Ergonomics of human-system interaction — Part 303: Requirements for electronic visual
displays
ISO 9241-307, Ergonomics of human-system interaction — Part 307: Analysis and compliance test methods
for electronic visual displays
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9241-302 apply.
4 General
4.1 Measurements — Basic measurements and derived procedures
The collection of (optical) lab measurements necessary for the compliance evaluations given in this part of
ISO 9241 are divided into basic measurements — identified by M and a measurement number — and
measurement procedures — identified by P and a procedure number (and letter in the case of supplementary
procedures) — briefly described below. Additional information, including decisions on developing the methods
and their use for the definition of compliance procedures, can be found in Annex B.
4.1.1 Basic measurements (or evaluation) — Method M
Basic measurements should describe a fundamental method in as simple a form as possible. Most of the
essential measurement parameters (such as screen location, viewing direction, test pattern) are not specified.
The specified result is a physical quantity or some other directly measured property, and does not involve any
processing of the collected data. These results are usually not directly used in a compliance procedure of the
sort specified in ISO 9241-307. Rather, in a compound measurement procedure (see 4.1.2), a basic
measurement will be used to achieve sets or collections of data.
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SIST EN ISO 9241-305:2009
ISO 9241-305:2008(E)
These basic measurements define the types of meters acceptable for use, meter parameters, and any default
parameters (“fixed measurement conditions”), and list the parameters that are to be varied by the compound
measurement procedure (“configurable measurement conditions”). These latter parameters are often defined
by the compliance procedure (see ISO 9241-307).
4.1.2 Compound measurement procedures — Procedure P
Compound measurement procedures are methods that collect and evaluate physical quantities that were
measured using a basic method (see 4.1.1). These procedures reference basic measurements, and may
specify the specific requirements for the “configurable measurement conditions”. They also include any
special preparation procedures. The result of a procedure is a collection of basic quantities (e.g. area or
angular distribution of luminance), or derived quantities (e.g. luminance contrast, colour difference). In many
cases, the measurement procedures could have some of the configurable measurement conditions defined by
the compliance procedure (see ISO 9241-307).
4.2 Structure
The measurement methods given in this part of ISO 9241 are structured as follows.
a) Objective: this describes the purpose and quantities measured.
b) Applicability: this describes the type of displays/applications in which the particular measurement is
relevant.
c) Preparation and set-up: this describes fixed and configurable measurement conditions, optional
accessory equipment, and any special preliminary requirements.
d) Procedure: this describes the measurement or references basic measurement method.
e) Analysis: this describes any analysis of the measured data.
f) Reporting: this describes the form of reporting, including the number of significant digits, where
appropriate.
g) Comments: this describes any special concerns or relevant information not contained elsewhere.
4.3 Matrix of measurement conditions methods and procedures
A matrix of measurement conditions, methods and procedures comparing various source documents
(including earlier International Standards) can be found in Annex C.
NOTE Many of the procedures in this document have been incorporated, in whole or in part, from ISO 9241-3:1992.
See Annex C and the Bibliography for further references.
5 Measurement conditions
5.1 Preparations and procedures
5.1.1 CRT (cathode ray tube) monitor standard preparation
Allow sufficient time for the display luminance to stabilise, with a minimum of 20 min.
5.1.1.1 Technology dependent parameters
Manual degauss in measurement position (for colour displays only). This refers to externally applied degauss
(not manual activation of an internal system).
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SIST EN ISO 9241-305:2009
ISO 9241-305:2008(E)
5.1.1.2 Cleaning
Ensure that the display is clean.
5.1.1.3 Alignment
The display screen should be aligned such that a plane tangential to the screen centre is parallel to the axes
of the measurement system(s).
Tilt: the active display area shall be aligned such that a horizontal line through the screen centre is parallel to
the horizontal axis of the measurement instrument and/or of the measurement instrument travel.
5.1.1.4 Brightness and contrast control settings
Adjust the brightness control until the raster is at cut-off.
Adjustment should be performed under the lighting conditions for the specific compliance route as specified in
ISO 9241-307.
2
After adjusting the display brightness to its default, adjust the centre-screen luminance to 100 cd/m at 20 %
screen loading. If this is not achievable, report the centre-screen luminance.
The controls shall remain at these settings for all measurements.
5.1.1.5 Image size
Use the factory setting or default, if available. Otherwise, adjust to a specified size.
5.1.1.6 Video drive levels
If the display uses an analogue interface, then the drive level(s) shall be specified for video signal lines.
Most applications drive the standard RGB interface with either 0,47 V or 0,7 V (corresponding to 2/3 video and
full video respectively) and the use of one of these values is recommended. The value used should be
specified.
5.1.2 LCD (liquid crystal display) monitor standard preparation
The flat panel display unit to be tested shall be physically prepared for testing.
5.1.2.1 Display warm-up
Allow sufficient time for the display luminance to stabilise, with a minimum of 20 min. When indicated by the
manufacturer, the display shall be warmed up for the specified time (not to exceed 1 h).
5.1.2.2 Technology dependent parameters
Testing shall be conducted under normal user conditions for power supply. The bias settings (if any) of the
display shall be set to those expected under typical use. Any reflection treatment or filter that is in place for the
test specified in 6.5 shall be in place for every test.
One adjustment setting shall be used for each complete test sequence. If multiple settings are provided, this
implies multiple complete test sequences.
5.1.2.3 Cleaning
Ensure that the display is clean.
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SIST EN ISO 9241-305:2009
ISO 9241-305:2008(E)
5.1.2.4 Alignment
The display screen should be aligned such that a plane tangential to the screen centre is parallel to the axes
of the measurement system(s).
Tilt: the active display area shall be aligned such that a horizontal line through the screen centre is parallel to
the horizontal axis of the measurement instrument and/or of the measurement instrument travel.
5.1.2.5 Brightness and contrast control settings
The display shall be adjusted to its default or preset brightness and contrast. The controls shall remain at
these settings for all measurements. Adjustment should be performed under the lighting conditions for the
specific compliance route as specified in ISO 9241-307.
5.1.2.6 Image size
Use the factory setting or the default, if available. Otherwise, adjust to a specified size.
5.1.2.7 Video drive levels
If the display uses an analogue interface, then the drive level(s) shall be specified for video signal lines.
Most applications drive the standard RGB interface with either 0,47 V or 0,7 V (corresponding to 2/3 video and
full video respectively) and the use of one of these values is recommended. The value used should be
specified.
5.1.3 Front projection display standard preparation (fixed resolution systems)
5.1.3.1 Display warm-up
Measurements are carried out after 100 h operation of the projection lamp (burn-in time). After switching on,
the minimum warm-up time shall be 1 h unless otherwise specified in ISO 9241-307.
5.1.3.2 Technology depending parameters
Testing shall be conducted under normal user conditions for power supply. The bias settings (if any) of the
display shall be set to those expected under typical use. Any reflection treatment or filter that is in place for the
test specified in 6.5 shall be in place for every test.
One adjustment setting shall be used for each complete test sequence. If multiple settings are provided, this
implies multiple complete test sequences.
5.1.3.3 Cleaning
Ensure that the display screen is clean.
5.1.3.4 Alignment
All optics, convergence controls and focus shall be adjusted so that the projected image appears sharp over
the largest percentage of the illuminated area. Front projection systems shall be positioned relative to the
screen according to the manufacturer’s specifications for angle, height, and distance. Rear-projection systems
shall be adjusted so that the image fills the screen completely (not overfill).
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SIST EN ISO 9241-305:2009
ISO 9241-305:2008(E)
5.1.3.5 Brightness and contrast control settings
The control designed to adjust brightness shall be set to the point where the maximum number of signal level
blocks on th
...