Audio, video and related equipment - Methods of measurement for power consumption - Part 7: Computer monitors

IEC 62087-7:2018 specifies the determination of the power consumption of computer monitors including, but is not limited to, those with CRT, LCD, PDP or OLED technologies. Computer monitors that include touch screen functionality are included in the scope of this document. This document is limited to computer monitors that are powered from a main power source other than a battery. Computer monitors that are powered from a battery source are not covered by this document. However mains-powered computer monitors may include any number of auxiliary batteries.
Computer monitors connected by digital inputs such as DisplayPort, HDMI, DVI, or by analogue VGA input, are considered in this document. This document does not apply to network- and wirelessly connected computer monitors.
A computer monitor is a display device that does not include a TV tuner and is intended to be used to display the video signals from a computer. These video signals are produced from software programs that are operating within the computer and can consist of static and moving images. As such, test procedures using static patterns, dynamic video and web-based video are specified.
The test methods specified in this document can be applied to computer monitors of any size, however, this document is not applicable to specialized monitors associated with medical equipment, publishing and other professional, commercial or industrial uses.
The various modes of operation that are relevant for measuring power consumption are also defined.
The measuring conditions in this document represent the normal use of the equipment and can differ from specific conditions, for example as specified in safety standards.

Appareils audio, vidéo et matériel connexe – Méthodes de mesure de la consommation de puissance - Partie 7 : Moniteurs d'ordinateurs

L'IEC 62087-7:2018 spécifie la détermination de la consommation de puissance des moniteurs d'ordinateurs, et notamment de ceux qui utilisent les technologies CRT, LCD, PDP ou OLED. Les moniteurs d'ordinateurs qui disposent d'une fonctionnalité d'écran tactile sont inclus dans le domaine d'application du présent document. Le présent document ne traite que des moniteurs d'ordinateurs alimentés en électricité par une source d'énergie principale autre qu'une batterie. Les moniteurs d'ordinateurs alimentés par batterie ne sont pas couverts par le présent document. Les moniteurs d'ordinateurs alimentés sur secteur peuvent toutefois comprendre un certain nombre de batteries auxiliaires.
Les moniteurs d'ordinateurs connectés par le biais d'entrées numériques de type DisplayPort, HDMI ou DVI, par exemple, ou au moyen d'une entrée VGA analogique, sont traités dans le présent document. Le présent document ne s'applique pas aux moniteurs d'ordinateurs connectés en réseau et sans fil.
Un moniteur d'ordinateur est un dispositif d'affichage qui ne comporte pas de récepteur TV et qui est destiné à être utilisé pour afficher les signaux vidéo à partir d'un ordinateur. Ces signaux vidéo sont produits par des logiciels informatiques exécutés sur l'ordinateur et peuvent être constitués d'images fixes et mobiles. A ce titre, les procédures d'essai qui utilisent des modèles statiques, la vidéo dynamique et la vidéo sur le Web sont spécifiées.
Les méthodes d'essai spécifiées dans le présent document peuvent être appliquées à tous les moniteurs d'ordinateurs, quelle que soit leur taille. En revanche, le présent document ne s'applique pas aux moniteurs spéciaux liés au matériel médical, à l'édition et à d'autres utilisations professionnelles, commerciales ou industrielles.
Les différents modes de fonctionnement adaptés au mesurage de la consommation de puissance sont également définis.
Les conditions de mesure du présent document sont représentatives de l'usage normal du matériel et peuvent différer des conditions particulières, comme celles spécifiées dans les normes de sécurité.

General Information

Status
Published
Publication Date
05-Dec-2018
Current Stage
PPUB - Publication issued
Completion Date
06-Dec-2018
Ref Project

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IEC 62087-7
Edition 1.0 2018-12
INTERNATIONAL
STANDARD
Audio, video, and related equipment – Methods of measurement for power
consumption
Part 7: Computer monitors
IEC 62087-7:2018-12(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2018 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

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---------------------- Page: 2 ----------------------
IEC 62087-7
Edition 1.0 2018-12
INTERNATIONAL
STANDARD
Audio, video, and related equipment – Methods of measurement for power
consumption
Part 7: Computer monitors
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.10 ISBN 978-2-8322-6329-7

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62087-7:2018 © IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms, definitions and abbreviated terms ........................................................................ 8

3.1 Terms and definitions .............................................................................................. 8

3.2 Abbreviated terms ................................................................................................... 8

4 Specification of operating modes and functions ............................................................... 8

4.1 General ................................................................................................................... 8

4.2 Auto power down function ....................................................................................... 9

5 Measurement conditions ................................................................................................ 10

5.1 General ................................................................................................................. 10

5.2 Power supply ........................................................................................................ 10

5.3 Environmental conditions ...................................................................................... 10

5.4 Ambient light conditions ........................................................................................ 10

5.5 Measuring equipment ............................................................................................ 10

5.5.1 Power measuring instrument ......................................................................... 10

5.5.2 Luminance measuring device ......................................................................... 10

5.5.3 Illuminance measuring instrument .................................................................. 10

5.6 Signal generation .................................................................................................. 10

5.6.1 Equipment ..................................................................................................... 10

5.6.2 Interfaces ...................................................................................................... 10

5.6.3 Accuracy ....................................................................................................... 10

5.7 Light source for specific illuminance levels ............................................................ 11

5.8 Light source for disabling the ABC feature ............................................................ 11

5.9 Picture controls ..................................................................................................... 11

5.9.1 Manufacturer's settings .................................................................................. 11

5.9.2 Static test pattern settings ............................................................................. 11

6 Procedure ...................................................................................................................... 12

6.1 Order of activities.................................................................................................. 12

6.2 Preparation ........................................................................................................... 13

6.2.1 Measuring plan .............................................................................................. 13

6.2.2 Power supply voltage and frequency .............................................................. 14

6.2.3 Input terminals ............................................................................................... 14

6.2.4 Video signal, on-mode power consumption procedure ................................... 14

6.2.5 Video format .................................................................................................. 14

6.2.6 Automatic brightness control capabilities ....................................................... 14

6.2.7 Automatic brightness control levels ................................................................ 15

6.3 Initial activities ...................................................................................................... 15

6.3.1 Order of initial activities ................................................................................. 15

6.3.2 Cool down ..................................................................................................... 16

6.3.3 Installation ..................................................................................................... 16

6.3.4 Application of input signals ............................................................................ 16

6.3.5 Luminance measuring device setup ............................................................... 16

6.3.6 Light source setup ......................................................................................... 16

6.3.7 Power ............................................................................................................ 17

---------------------- Page: 4 ----------------------
IEC 62087-7:2018 © IEC 2018 – 3 –

6.3.8 Computer monitor settings ............................................................................. 17

6.4 Determination of power consumption, on mode ..................................................... 18

6.4.1 Order of activities .......................................................................................... 18

6.4.2 Stabilization ................................................................................................... 18

6.4.3 Computer monitors without automatic brightness control enabled by

default ........................................................................................................... 18

6.4.4 Computer monitors with automatic brightness control enabled by default ....... 19

6.4.5 Power measurement ...................................................................................... 20

6.5 Determination of power factor ............................................................................... 21

6.6 Determination of power consumption, partial on mode .......................................... 21

6.6.1 General ......................................................................................................... 21

6.6.2 Order of activities .......................................................................................... 21

6.6.3 AV inputs ....................................................................................................... 21

6.6.4 Standby-passive ............................................................................................ 21

6.6.5 Standby-active, low ....................................................................................... 22

6.7 Determination of power consumption, off mode ..................................................... 22

6.7.1 Connections and networking .......................................................................... 22

6.7.2 Availability ..................................................................................................... 22

6.7.3 Measurement ................................................................................................. 22

Bibliography .......................................................................................................................... 23

Figure 1 – Recommended order of activities ......................................................................... 13

Figure 2 – Order of initial activities........................................................................................ 15

Figure 3 – Light source configuration .................................................................................... 17

Figure 4 – Order of activities for determining power consumption, on mode .......................... 19

Figure 5 – Order of activities for determining the power consumption, partial on mode ......... 21

Table 1 – Operating modes and functions ............................................................................... 9

Table 2 – Luminance levels for specified MP resolutions ...................................................... 12

---------------------- Page: 5 ----------------------
– 4 – IEC 62087-7:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUDIO, VIDEO, AND RELATED EQUIPMENT –
METHODS OF MEASUREMENT FOR POWER CONSUMPTION
Part 7: Computer monitors
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

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with the International Organization for Standardization (ISO) in accordance with conditions determined by

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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

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indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62087-7 has been prepared by technical area 12: AV Energy 14

efficiency and smart grid applications of IEC technical committee 100: Audio, video and

multimedia systems and equipment.
The text of this International Standard is based on the following documents:
CDV Report on voting
100/2916/CDV 100/2988/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 6 ----------------------
IEC 62087-7:2018 © IEC 2018 – 5 –

A list of all parts in the IEC 62087 series, published under the general title Audio, video and

related equipment, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 7 ----------------------
– 6 – IEC 62087-7:2018 © IEC 2018
INTRODUCTION

This part of IEC 62087 specifies methods of measurement for the power consumption of

computer monitors for use with computers. The test method includes power measurement

using static patterns and both the broadcast and web-based dynamic test loops.

The test method also includes testing with the automatic brightness control (ABC) function

where it is incorporated into a computer monitor.

The test method has also been made consistent with the test method for televisions in

IEC 62087-3.
---------------------- Page: 8 ----------------------
IEC 62087-7:2018 © IEC 2018 – 7 –
AUDIO, VIDEO, AND RELATED EQUIPMENT –
METHODS OF MEASUREMENT FOR POWER CONSUMPTION
Part 7: Computer monitors
1 Scope

This part of IEC 62087 specifies the determination of the power consumption of computer

monitors including, but is not limited to, those with CRT, LCD, PDP or OLED technologies.

Computer monitors that include touch screen functionality are included in the scope of this

document. This document is limited to computer monitors that are powered from a main power

source other than a battery. Computer monitors that are powered from a battery source are

not covered by this document. However mains-powered computer monitors may include any

number of auxiliary batteries.

Computer monitors connected by digital inputs such as DisplayPort, HDMI, DVI, or by

analogue VGA input, are considered in this document. This document does not apply to

network- and wirelessly connected computer monitors.

A computer monitor is a display device that does not include a TV tuner and is intended to be

used to display the video signals from a computer. These video signals are produced from

software programs that are operating within the computer and can consist of static and

moving images. As such, test procedures using static patterns, dynamic video and web-based

video are specified.

The test methods specified in this document can be applied to computer monitors of any size,

however, this document is not applicable to specialized monitors associated with medical

equipment, publishing and other professional, commercial or industrial uses.

The various modes of operation that are relevant for measuring power consumption are also

defined.

The measuring conditions in this document represent the normal use of the equipment and

can differ from specific conditions, for example as specified in safety standards.

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.

IEC 62087-1, Audio, video, and related equipment – Determination of power consumption –

Part 1: General

IEC 62087-2, Audio, video, and related equipment – Determination of power consumption –

Part 2: Signals and media
IEC 62301, Household electrical appliances – Measurement of standby power
---------------------- Page: 9 ----------------------
– 8 – IEC 62087-7:2018 © IEC 2018
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62087-1 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
ND filter
neutral density filter
optical device that reduces the light intensity in the visible wavelength region
3.1.2
computer monitor
product for the display of data, visual and video signals from a computer
3.1.3
default picture setting
picture setting as set by the manufacturer for computer monitors
3.1.4
special functions

functions that are related to, but not required for, the basic operation of the device

Note 1 to entry: Examples of special functions include, but are not limited to, special sound processing, power

saving functions (e.g. automatic brightness control), cameras, motion sensors and microphones.

3.2 Abbreviated terms
AV audio-visual
ABC automatic brightness control
CRT cathode ray tube
DVI Digital Visual Interface
LCD liquid crystal display
LMD luminance measuring device
ND neutral density
OLED organic light-emitting diode
PDP plasma display panel
SCR silicon controlled rectifier
UUT unit under test
VGA Video Graphics Array
4 Specification of operating modes and functions
4.1 General
Table 1 contains the operating modes and functions for computer monitors.
---------------------- Page: 10 ----------------------
IEC 62087-7:2018 © IEC 2018 – 9 –
4.2 Auto power down function

An auto power down feature may be implemented on a computer monitor to power down into

a standby mode after a predetermined time and possibly predetermined conditions. Such a

feature should be referred to as "auto power down".
Table 1 – Operating modes and functions
Power Mode Sub-mode Function(s) Description
0 W Disconnected Disconnected Disconnect from The equipment is
power source disconnected from all
external power sources.
Off Off Off The equipment is connected
≥0 W
to an external power source
and provides no functions
that depend on a power
source. The equipment
cannot be switched into any
other mode with the remote
control unit, or an external or
internal signal. Note that
some power may be
consumed if an EMC filter or
other components exist on
the source side of the power
switch.
> 0 W Partial On- Standby-passive The equipment is connected
– Wake on
to an external power source
• remote control
and does not provide its
• internal signa
primary functions. The
equipment can be switched
into another mode with the
remote control unit or an
internal signal, but not with
an external signal
Standby-active, low The equipment is connected
– Wake on
to an external power source
• remote control
and does not provide its
• internal signal
primary functions.
• external signal
The equipment can be
switched into another mode
with the remote control unit,
an internal signal, or an
external signal.
Standby-active, high The equipment is connected
– Wake on
to an external power source
• remote control
and does not provide its
• internal signal
primary functions.
• external signal
The equipment can be
switched into another mode
– Data
with the remote control unit,
communications
an internal signal, or an
external signal. Additionally,
the equipment is exchanging/
receiving data with/from an
external source.
On Operation The computer monitor is
Operation
connected to an external
power source and provides
pictures and, if possible,
sound.
---------------------- Page: 11 ----------------------
– 10 – IEC 62087-7:2018 © IEC 2018
5 Measurement conditions
5.1 General

Clause 5 specifies requirements that are independent of the equipment to be evaluated. When

setting up a test laboratory, these requirements shall be taken into account.
The requirements in Clause 5 apply to the procedures specified in Clause 6.
5.2 Power supply
Defined in IEC 62087-1:2015, 5.1.1.
5.3 Environmental conditions
Defined in IEC 62087-1:2015, 5.1.2.
5.4 Ambient light conditions

For determining on-mode power consumption for computer monitors with ABC enabled,

≤ 1 lux shall be confirmed at the surface of the ABC sensor assembly with the light sources

(5.7, 5.8) off and the UUT in the off or disconnected mode.

For determining the peak luminance ratio with a non-contact LMD, ≤ 5 lux shall be confirmed

at the nominal centre of the display area of the UUT in the off or disconnected mode. This

requirement applies whether or not a light source (5.8) is applied to disable the ABC feature.

A dark room and/or shroud may be necessary in order to achieve the required ambient light

conditions.
5.5 Measuring equipment
5.5.1 Power measuring instrument
Defined in IEC 62087-1:2015, 5.1.5.
5.5.2 Luminance measuring device
Defined in IEC 62087-1:2015, 5.1.6.
5.5.3 Illuminance measuring instrument
Defined in IEC 62087-1:2015, 5.1.7.
5.6 Signal generation
5.6.1 Equipment
Defined in IEC 62087-2:2015, 6.1.
5.6.2 Interfaces
Defined in IEC 62087-2:2015, 6.2.
5.6.3 Accuracy
Defined in IEC 62087-2:2015, 6.3.
---------------------- Page: 12 ----------------------
IEC 62087-7:2018 © IEC 2018 – 11 –
5.7 Light source for specific illuminance levels

The light source used for illuminating the ABC sensor to specific illuminance levels shall use a

dimmable halogen lamp in a sealed reflector and shall have a diameter of 120 mm or less.

The rated correlated colour temperature shall be 2 800 K ± 300 K at its rated voltage. The

front surface of the lamp shall be clear (i.e. not coloured or coated with a spectrum modifying

material) and may have a smooth or granular front surface. The lamp assembly shall not

modify the spectrum of the halogen source, including the IR and UV bands.

For luminance levels below 10 lux, a 2-stop ND filter (3.1.1) shall be used. No ND filter shall

be used for luminance levels at or above 10 lux. The ND filter shall be of the absorptive type

and shall be large enough cover the entire light acceptance area of the ABC sensor assembly

with a margin of at least 5 mm on all sides. The ND filter shall have an average transmission

of 25 % ± 2,5 % within the visible range, which is 400 nm to 700 nm, without selectively

absorbing light at specific wavelengths.

Specific illuminance levels shall be obtained by controlling the voltage and/or duty cycle to the

above light source.

The model of the lamp used for illuminating the ABC sensor to specific illuminance levels

shall be recorded.

Some lighting controllers, such as those with SCR-based circuits, can introduce current

spikes into the power source. Such controllers should be avoided or otherwise isolated from

the power source for the UUT.
5.8 Light source for disabling the ABC feature

The light source used for disabling the ABC feature shall use a dimmable halogen lamp in a

sealed reflector and shall have a diameter of 120 mm or less. The rated correlated colour

temperature shall be 2 800 K ± 300 K at its rated voltage. The front surface of the lamp shall

be clear (i.e. not coloured or coated with a spectrum modifying material) and may have a

smooth or granular front surface. The lamp assembly shall not modify the spectrum of the

halogen source, including the IR and UV bands. The light source shall be capable of providing

300 lux or greater when applied directly to the ABC sensor assembly.
The model of the lamp used for disabling the ABC feature shall be recorded.
5.9 Picture controls
5.9.1 Manufacturer's settings

Where manufacturer’s settings are specified in the measurement procedure, the controls shall

be in the position adjusted by the manufacturer for shipment to the end user. These controls

shall remain in this state for the duration of the test.
5.9.2 Static test pattern settings

Without changing any the manufacturer’s settings, the computer monitor shall display a test

pattern that contains a 100 % white window covering 80 % of the screen. The luminance of

the window shall be measured and recorded. The brightness shall then be adjusted until the

window of the screen is set at the luminance specified in Table 2 for the appropriate

resolution.
---------------------- Page: 13 ----------------------
– 12 – IEC 62087-7:2018 © IEC 2018
Table 2 – Luminance levels for specified MP resolutions
Product cd/m
Less than or equal to 1,1 × 10 pixel resolution 175
Greater than 1,1 × 10 pixel resolution 200

If the display’s maximum luminance is less than the prescribed luminance in the table above,

the maximum luminance shall be used. Similarly, if the display’s minimum luminance is

greater than the prescribed luminance, the minimum luminance shall be used. The luminance

used for power measurement shall be reported in the test report.
6 Procedure
6.1 Order of activities
The following order of activities is recommended (also represented in Figure 1):
• preparation (Subclause 6.2);
• initial activities (Subclause 6.3);
• determination of power consumption, on mode (Subclause 6.4);
• determination of power factor (Subclause 6.5);
• determination of power consumption, partial on mode (Subclause 6.6);
• determination of power consumption, off mode (Subclause 6.7).

The above order is chosen to ensure proper stabilization prior to the taking of each

measuremen
...

IEC 62087-7
Edition 1.0 2018-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Audio, video, and related equipment – Methods of measurement for power
consumption
Part 7: Computer monitors
Appareils audio, vidéo et matériel connexe – Méthodes de mesure de la
consommation de puissance
Partie 7: Moniteurs d'ordinateurs
IEC 62087-7:2018-12(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2018 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

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---------------------- Page: 2 ----------------------
IEC 62087-7
Edition 1.0 2018-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Audio, video, and related equipment – Methods of measurement for power
consumption
Part 7: Computer monitors
Appareils audio, vidéo et matériel connexe – Méthodes de mesure de la
consommation de puissance
Partie 7: Moniteurs d'ordinateurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.10 ISBN 978-2-8322-1092-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62087-7:2018 © IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms, definitions and abbreviated terms ........................................................................ 8

3.1 Terms and definitions .............................................................................................. 8

3.2 Abbreviated terms ................................................................................................... 8

4 Specification of operating modes and functions ............................................................... 8

4.1 General ................................................................................................................... 8

4.2 Auto power down function ....................................................................................... 9

5 Measurement conditions ................................................................................................ 10

5.1 General ................................................................................................................. 10

5.2 Power supply ........................................................................................................ 10

5.3 Environmental conditions ...................................................................................... 10

5.4 Ambient light conditions ........................................................................................ 10

5.5 Measuring equipment ............................................................................................ 10

5.5.1 Power measuring instrument ......................................................................... 10

5.5.2 Luminance measuring device ......................................................................... 10

5.5.3 Illuminance measuring instrument .................................................................. 10

5.6 Signal generation .................................................................................................. 10

5.6.1 Equipment ..................................................................................................... 10

5.6.2 Interfaces ...................................................................................................... 10

5.6.3 Accuracy ....................................................................................................... 10

5.7 Light source for specific illuminance levels ............................................................ 11

5.8 Light source for disabling the ABC feature ............................................................ 11

5.9 Picture controls ..................................................................................................... 11

5.9.1 Manufacturer's settings .................................................................................. 11

5.9.2 Static test pattern settings ............................................................................. 11

6 Procedure ...................................................................................................................... 12

6.1 Order of activities.................................................................................................. 12

6.2 Preparation ........................................................................................................... 13

6.2.1 Measuring plan .............................................................................................. 13

6.2.2 Power supply voltage and frequency .............................................................. 14

6.2.3 Input terminals ............................................................................................... 14

6.2.4 Video signal, on-mode power consumption procedure ................................... 14

6.2.5 Video format .................................................................................................. 14

6.2.6 Automatic brightness control capabilities ....................................................... 14

6.2.7 Automatic brightness control levels ................................................................ 15

6.3 Initial activities ...................................................................................................... 15

6.3.1 Order of initial activities ................................................................................. 15

6.3.2 Cool down ..................................................................................................... 16

6.3.3 Installation ..................................................................................................... 16

6.3.4 Application of input signals ............................................................................ 16

6.3.5 Luminance measuring device setup ............................................................... 16

6.3.6 Light source setup ......................................................................................... 16

6.3.7 Power ............................................................................................................ 17

---------------------- Page: 4 ----------------------
IEC 62087-7:2018 © IEC 2018 – 3 –

6.3.8 Computer monitor settings ............................................................................. 17

6.4 Determination of power consumption, on mode ..................................................... 18

6.4.1 Order of activities .......................................................................................... 18

6.4.2 Stabilization ................................................................................................... 18

6.4.3 Computer monitors without automatic brightness control enabled by

default ........................................................................................................... 18

6.4.4 Computer monitors with automatic brightness control enabled by default ....... 19

6.4.5 Power measurement ...................................................................................... 20

6.5 Determination of power factor ............................................................................... 21

6.6 Determination of power consumption, partial on mode .......................................... 21

6.6.1 General ......................................................................................................... 21

6.6.2 Order of activities .......................................................................................... 21

6.6.3 AV inputs ....................................................................................................... 21

6.6.4 Standby-passive ............................................................................................ 21

6.6.5 Standby-active, low ....................................................................................... 22

6.7 Determination of power consumption, off mode ..................................................... 22

6.7.1 Connections and networking .......................................................................... 22

6.7.2 Availability ..................................................................................................... 22

6.7.3 Measurement ................................................................................................. 22

Bibliography .......................................................................................................................... 23

Figure 1 – Recommended order of activities ......................................................................... 13

Figure 2 – Order of initial activities........................................................................................ 15

Figure 3 – Light source configuration .................................................................................... 17

Figure 4 – Order of activities for determining power consumption, on mode .......................... 19

Figure 5 – Order of activities for determining the power consumption, partial on mode ......... 21

Table 1 – Operating modes and functions ............................................................................... 9

Table 2 – Luminance levels for specified MP resolutions ...................................................... 12

---------------------- Page: 5 ----------------------
– 4 – IEC 62087-7:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUDIO, VIDEO, AND RELATED EQUIPMENT –
METHODS OF MEASUREMENT FOR POWER CONSUMPTION
Part 7: Computer monitors
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

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governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

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other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62087-7 has been prepared by technical area 12: AV Energy

efficiency and smart grid applications of IEC technical committee 100: Audio, video and

multimedia systems and equipment.
The text of this International Standard is based on the following documents:
CDV Report on voting
100/2916/CDV 100/2988/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 6 ----------------------
IEC 62087-7:2018 © IEC 2018 – 5 –

A list of all parts in the IEC 62087 series, published under the general title Audio, video and

related equipment, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
– 6 – IEC 62087-7:2018 © IEC 2018
INTRODUCTION

This part of IEC 62087 specifies methods of measurement for the power consumption of

computer monitors for use with computers. The test method includes power measurement

using static patterns and both the broadcast and web-based dynamic test loops.

The test method also includes testing with the automatic brightness control (ABC) function

where it is incorporated into a computer monitor.

The test method has also been made consistent with the test method for televisions in

IEC 62087-3.
---------------------- Page: 8 ----------------------
IEC 62087-7:2018 © IEC 2018 – 7 –
AUDIO, VIDEO, AND RELATED EQUIPMENT –
METHODS OF MEASUREMENT FOR POWER CONSUMPTION
Part 7: Computer monitors
1 Scope

This part of IEC 62087 specifies the determination of the power consumption of computer

monitors including, but is not limited to, those with CRT, LCD, PDP or OLED technologies.

Computer monitors that include touch screen functionality are included in the scope of this

document. This document is limited to computer monitors that are powered from a main power

source other than a battery. Computer monitors that are powered from a battery source are

not covered by this document. However mains-powered computer monitors may include any

number of auxiliary batteries.

Computer monitors connected by digital inputs such as DisplayPort, HDMI, DVI, or by

analogue VGA input, are considered in this document. This document does not apply to

network- and wirelessly connected computer monitors.

A computer monitor is a display device that does not include a TV tuner and is intended to be

used to display the video signals from a computer. These video signals are produced from

software programs that are operating within the computer and can consist of static and

moving images. As such, test procedures using static patterns, dynamic video and web-based

video are specified.

The test methods specified in this document can be applied to computer monitors of any size,

however, this document is not applicable to specialized monitors associated with medical

equipment, publishing and other professional, commercial or industrial uses.

The various modes of operation that are relevant for measuring power consumption are also

defined.

The measuring conditions in this document represent the normal use of the equipment and

can differ from specific conditions, for example as specified in safety standards.

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.

IEC 62087-1, Audio, video, and related equipment – Determination of power consumption –

Part 1: General

IEC 62087-2, Audio, video, and related equipment – Determination of power consumption –

Part 2: Signals and media
IEC 62301, Household electrical appliances – Measurement of standby power
---------------------- Page: 9 ----------------------
– 8 – IEC 62087-7:2018 © IEC 2018
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62087-1 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
ND filter
neutral density filter
optical device that reduces the light intensity in the visible wavelength region
3.1.2
computer monitor
product for the display of data, visual and video signals from a computer
3.1.3
default picture setting
picture setting as set by the manufacturer for computer monitors
3.1.4
special functions

functions that are related to, but not required for, the basic operation of the device

Note 1 to entry: Examples of special functions include, but are not limited to, special sound processing, power

saving functions (e.g. automatic brightness control), cameras, motion sensors and microphones.

3.2 Abbreviated terms
AV audio-visual
ABC automatic brightness control
CRT cathode ray tube
DVI Digital Visual Interface
LCD liquid crystal display
LMD luminance measuring device
ND neutral density
OLED organic light-emitting diode
PDP plasma display panel
SCR silicon controlled rectifier
UUT unit under test
VGA Video Graphics Array
4 Specification of operating modes and functions
4.1 General
Table 1 contains the operating modes and functions for computer monitors.
---------------------- Page: 10 ----------------------
IEC 62087-7:2018 © IEC 2018 – 9 –
4.2 Auto power down function

An auto power down feature may be implemented on a computer monitor to power down into

a standby mode after a predetermined time and possibly predetermined conditions. Such a

feature should be referred to as "auto power down".
Table 1 – Operating modes and functions
Power Mode Sub-mode Function(s) Description
0 W Disconnected Disconnected Disconnect from The equipment is
power source disconnected from all
external power sources.
Off Off Off The equipment is connected
≥0 W
to an external power source
and provides no functions
that depend on a power
source. The equipment
cannot be switched into any
other mode with the remote
control unit, or an external or
internal signal. Note that
some power may be
consumed if an EMC filter or
other components exist on
the source side of the power
switch.
> 0 W Partial On- Standby-passive The equipment is connected
– Wake on
to an external power source
• remote control
and does not provide its
• internal signal
primary functions. The
equipment can be switched
into another mode with the
remote control unit or an
internal signal, but not with
an external signal
Standby-active, low The equipment is connected
– Wake on
to an external power source
• remote control
and does not provide its
• internal signal
primary functions.
• external signal
The equipment can be
switched into another mode
with the remote control unit,
an internal signal, or an
external signal.
Standby-active, high The equipment is connected
– Wake on
to an external power source
• remote control
and does not provide its
• internal signal
primary functions.
• external signal
The equipment can be
switched into another mode
– Data
with the remote control unit,
communications
an internal signal, or an
external signal. Additionally,
the equipment is exchanging/
receiving data with/from an
external source.
On Operation The computer monitor is
Operation
connected to an external
power source and provides
pictures and, if possible,
sound.
---------------------- Page: 11 ----------------------
– 10 – IEC 62087-7:2018 © IEC 2018
5 Measurement conditions
5.1 General

Clause 5 specifies requirements that are independent of the equipment to be evaluated. When

setting up a test laboratory, these requirements shall be taken into account.
The requirements in Clause 5 apply to the procedures specified in Clause 6.
5.2 Power supply
Defined in IEC 62087-1:2015, 5.1.1.
5.3 Environmental conditions
Defined in IEC 62087-1:2015, 5.1.2.
5.4 Ambient light conditions

For determining on-mode power consumption for computer monitors with ABC enabled,

≤ 1 lux shall be confirmed at the surface of the ABC sensor assembly with the light sources

(5.7, 5.8) off and the UUT in the off or disconnected mode.

For determining the peak luminance ratio with a non-contact LMD, ≤ 5 lux shall be confirmed

at the nominal centre of the display area of the UUT in the off or disconnected mode. This

requirement applies whether or not a light source (5.8) is applied to disable the ABC feature.

A dark room and/or shroud may be necessary in order to achieve the required ambient light

conditions.
5.5 Measuring equipment
5.5.1 Power measuring instrument
Defined in IEC 62087-1:2015, 5.1.5.
5.5.2 Luminance measuring device
Defined in IEC 62087-1:2015, 5.1.6.
5.5.3 Illuminance measuring instrument
Defined in IEC 62087-1:2015, 5.1.7.
5.6 Signal generation
5.6.1 Equipment
Defined in IEC 62087-2:2015, 6.1.
5.6.2 Interfaces
Defined in IEC 62087-2:2015, 6.2.
5.6.3 Accuracy
Defined in IEC 62087-2:2015, 6.3.
---------------------- Page: 12 ----------------------
IEC 62087-7:2018 © IEC 2018 – 11 –
5.7 Light source for specific illuminance levels

The light source used for illuminating the ABC sensor to specific illuminance levels shall use a

dimmable halogen lamp in a sealed reflector and shall have a diameter of 120 mm or less.

The rated correlated colour temperature shall be 2 800 K ± 300 K at its rated voltage. The

front surface of the lamp shall be clear (i.e. not coloured or coated with a spectrum modifying

material) and may be smooth or granular. The lamp assembly shall not modify the spectrum of

the halogen source, including the IR and UV bands.

For luminance levels below 10 lux, a 2-stop ND filter (3.1.1) shall be used. No ND filter shall

be used for luminance levels at or above 10 lux. The ND filter shall be of the absorptive type

and shall be large enough to cover the entire light acceptance area of the ABC sensor

assembly with a margin of at least 5 mm on all sides. The ND filter shall have an average

transmission of 25 % ± 2,5 % within the visible range, which is 400 nm to 700 nm, without

selectively absorbing light at specific wavelengths.

Specific illuminance levels shall be obtained by controlling the voltage and/or duty cycle to the

above light source.

The model of the lamp used for illuminating the ABC sensor to specific illuminance levels

shall be recorded.

Some lighting controllers, such as those with SCR-based circuits, can introduce current

spikes into the power source. Such controllers should be avoided or otherwise isolated from

the power source for the UUT.
5.8 Light source for disabling the ABC feature

The light source used for disabling the ABC feature shall use a dimmable halogen lamp in a

sealed reflector and shall have a diameter of 120 mm
...

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