EN 61947-2:2002

SLOVENSKI SIST EN 61947-2:2003

STANDARD
oktober 2003
Electronic projection - Measurement and documentation of key performance
criteria - Part 2: Variable resolution projectors (IEC 61947-2:2001)
ICS 33.160.99; 37.040.10 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 61947-2
NORME EUROPÉENNE
EUROPÄISCHE NORM February 2002
ICS 33.160.60;35.140;37.020
English version
Electronic projection –
Measurement and documentation of key
performance criteria
Part 2: Variable resolution projectors
(IEC 61947-2:2001)
Projection électronique – Elektronische Projektion –
Mesure et documentation des Messung und Dokumentation
critères principaux de performance wichtiger Leistungsmerkmale
Partie 2: Projecteurs à résolution Teil 2: Projektoren variabler Auflösung
variable (IEC 61947-2:2001)
(CEI 61947-2:2001)
This European Standard was approved by CENELEC on 2001-11-01. CENELEC 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 CENELEC 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 CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61947-2:2002 E
Foreword
The text of document 100/268/FDIS, future edition 1 of IEC 61947-2, prepared by SC 100C, Audio,
video and multimedia subsystems and equipment, of IEC TC 100, Audio, video and multimedia
systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61947-2 on 2001-11-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2002-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-11-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annexes A, B, D, G and ZA are normative and annexes C, E, F, H, I and J
are informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61947:2001 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
ISO 9241-8 NOTE Harmonized as EN ISO 9241-8:1997 (not modified).
IEC 60107-1 NOTE Harmonized as EN 60107-1:1997 (not modified).
__________
- 3 - EN 61947-2:2002
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60050-845 1987 International Electrotechnical --
Vocabulary (IEV)
Chapter 845: Lighting
1)
IEC 61947-1 - Electronic projection --
Part 1: Fixed resolution projectors
ISO 3741 1999 Acoustics - Determination of sound EN ISO 3741 1999
power levels of noise sources using
sound pressure - Prescision methods
for reverbation rooms
ISO 7779 1999 Acoustics EN ISO 7779 2001
Measurement of airborne noise emitted
by information technology and
telecommunications equipment
1)
To be published.
INTERNATIONAL IEC
STANDARD
61947-2
First edition
2001-09
Electronic projection –
Measurement and documentation
of key performance criteria –
Part 2:
Variable resolution projectors
 IEC 2001  Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
Commission Electrotechnique Internationale
PRICE CODE
X
International Electrotechnical Commission
For price, see current catalogue

– 2 – 61947-2  IEC:2001(E)
CONTENTS
FOREWORD . 4
INTRODUCTION .6
1 Scope . 7
2 Normative references . 7
3 Definitions. 8
4 General requirements. 12
5 Light output measurement and specification . 13
5.1 Light output specifications . 14
5.1.1 Light output specification for projectors with a separate screen . 14
5.1.2 Full-black light level specification. 15
5.1.3 Luminance specification for devices with an integral screen . 15
5.2 Light output uniformity. 15
5.2.1 Example of a uniformity specification. 15
5.3 Contrast ratio . 15
5.4 Blanking measurement and specification . 15
5.5 Effective blanking time . 16
5.6 Blanking specification. 16
6 Variable resolution projector characteristics. 17
6.1 Visual resolution measurement and specification. 17
6.1.1 Description and general requirements. 17
6.1.2 Horizontal resolution. 17
6.1.3 Vertical resolution . 18
6.1.4 Procedure . 18
6.2 Video frequency response specifications . 20
6.2.1 Frequency response specifications . 20
6.3 Viewing angle (half/gain) specification for devices with an integral screen. 20
6.4 Input signal format compatibility . 20
6.5 Response time . 20
6.6 Colour measurements . 21
6.6.1 Colour chromaticity. 21
6.6.2 Colour uniformity. 21
6.7 Keystone correction . 22
7 Range of focus and image size. 22
8 Audio characteristics . 22
9 Light source specification . 22
10 Noise: maximum sound level . 23
11 Power consumption. 23
12 Weight . 23
13 Dimensions .23
14 Recommended practices . 23
14.1 Recommended practice 1 − Sync hierarchy . 23
14.2 Recommended practice 2 − DC restoration. 23
14.3 Recommended practice 3 − Sync . 24
14.4 Recommended practice 4 − Scan range labelling. 24

61947-2  IEC:2001(E) – 3 –
Annex A (normative) Figures . 25
Annex B (normative) Pattern generator specifications . 29
Annex C (informative) Considerations in formulating this standard . 30
C.1 General. 30
C.2 Light output measurement . 30
C.3 Visual resolution measurement. 31
C.4 Possible causes for measurement errors . 31
C.5 Input signal levels .31
Annex D (normative) Complete sample specification . 33
Annex E (informative) Other issues, outside the scope of this standard, that may affect
picture clarity. 35
Annex F (informative) Possible causes of photometric measurement errors. 36
F.1 Size of measured spot. 36
F.2 Colour measurement. 36
Annex G (normative) Alternative method for measuring resolution using the NIDL grille
contrast method. 37
Annex H (informative) Photometer precision and veiling glare . 39
H.1 Photometer precision . 39
H.2 Integration time . 39
H.3 Veiling glare . 39
Annex I (informative) Light measuring devices . 41
Annex J (informative) Figure of merit for projection display colour gamut. 42
Bibliography . 44
Figure A.1 – Test patterns/measurements set-up . 25
Figure A.2 – Thirteen-point measuring grid . 26
Figure A.3 – Contrast measurement. 26
Figure A.4 – Vertical alternating lines. 26
Figure A.5 – Horizontal alternating lines. 27
Figure A.6 – Resolution equipment set-up/depth of modulation measurement. 27
Figure A.7 – Sync and blanking timing . 28
Figure C.1 − Simulation of lowered resolution
...