IEC 62087-7:2018

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
• ICS: 33.160.10 - Amplifiers
• Technical Committee: TA 12 - AV energy efficiency and smart grid applications
• Drafting Committee: PT 62087-7 - TC 100/TA 12/PT 62087-7
• Current Stage: PPUB - Publication issued
• Start Date: 06-Dec-2018
• Completion Date: 03-Jan-2019

Overview

IEC 62087-7:2018 specifies standardized methods of measurement for the power consumption of computer monitors. It covers mains‑powered displays (CRT, LCD, PDP, OLED and touch‑enabled monitors) intended to show video signals from computers and excludes battery‑powered devices and network/wireless‑only monitors. The standard defines test procedures using static test patterns, dynamic video loops and web‑based video, and describes the operating modes relevant to measuring power (on, partial‑on/standby, off).

Key topics and technical requirements

The standard sets out measurable conditions and procedures to ensure repeatable, comparable power measurements:

• Scope of devices: mains‑powered computer monitors (no TV tuner); digital (DisplayPort, HDMI, DVI) and analogue (VGA) inputs supported; specialized medical or industrial monitors excluded.
• Operating modes: definitions for on‑mode, partial‑on/standby modes and off‑mode, plus behavior of automatic brightness control (ABC) where present.
• Measurement conditions: requirements for power supply, environmental conditions and ambient light to represent normal use.
• Measuring equipment: specification of power meters, luminance and illuminance measurement devices and signal generation equipment.
• Test content: static patterns, broadcast/dynamic loops and web‑based video for realistic on‑mode testing; procedures for disabling/enabling ABC and setting picture controls.
• Test procedure details: preparation, stabilization/cool‑down, order of activities, determination of on‑mode, partial‑on and off‑mode power consumption, and power factor measurement.
• Repeatability and accuracy: guidance on signal generation accuracy, light source configurations and measurement tolerances to ensure consistent results.

Practical applications and who uses it

IEC 62087-7:2018 is used by:

• Manufacturers and design engineers for product development and power optimization of monitors.
• Test laboratories and certification bodies performing standardized energy measurements and compliance testing.
• Regulators and energy programs for energy labeling, minimum performance standards or efficiency benchmarking.
• Procurement and sustainability teams evaluating monitor energy use for corporate purchasing or green procurement.

Benefits include reliable comparison of display energy use, support for energy labeling and regulatory compliance, and guidance for assessing ABC and typical real‑world video workloads.

Related standards

• IEC 62087 (series) - other parts cover power measurement methods for audio/video equipment.
• IEC 62087-3 - related test methods for televisions; IEC 62087-7 aligns ABC and dynamic test approaches where applicable.

Keywords: IEC 62087-7:2018, power consumption, computer monitors, measurement methods, automatic brightness control, LCD, OLED, DisplayPort, HDMI, VGA, energy efficiency, test procedures.

Standards Content (Sample)

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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.10 ISBN 978-2-8322-6329-7

– 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

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

– 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
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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.

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.

– 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.
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

– 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.

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.
– 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.

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, with
...

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

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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

– 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

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

– 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
in the subject dealt with may participate in this preparatory work. International, governmental and non-
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
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
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.

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.
– 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.
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

– 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.

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.
– 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.

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 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 of 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.
– 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
measurement. The order may be varied as needed; however, the stabilization process prior to
the taking of each measurement shall effectively be the same as if the recommended order
had been followed.
Start
6.2 Preparation
6.3 Initial activities (Figure 2)
6.4 Determination of power
consumption, On mode
(Figure 4)
6.5 Determination power factor
6.6 Determination of power
consumption, Partial On mode
(Figure 5)
6.7 Determination of
power consumption,
Off mode
End
IEC
Figure 1 – Recommended order of activities
6.2 Preparation
6.2.1 Measuring plan
Before the UUT has been installed, a measuring plan should be developed based on the
specifications of the UUT and the region in which the results are to be recorded. The
measuring plan is based on the decision points in 6.2.2 to 6.2.9. These decision points
include:
– power supply voltage and frequency (6.2.2);
– input terminals (6.2.3);
– video signal, On mode power consumption procedure (6.2.4);
– video format (6.2.6);
– automatic brightness control capabilities (6.2.7).
After these decisions have been made, the following activities can be expected to be
deterministic.
– 14 – IEC 62087-7:2018 © IEC 2018
6.2.2 Power supply voltage and frequency
Whether the UUT is to be powered by an included external power supply (IEC 62087-1:2015,
5.1.1.2), mains power (IEC 62087-1:2015, 5.1.1.3), and/or power from other than the mains
(IEC 62087-1:2015, 5.1.1.4) shall be determined and shall be described in the report.
The voltage and frequency of the power source shall be recorded.
6.2.3 Input terminals
A single set of input terminals shall be selected for use during the procedure. If the power
consumption of the UUT is to be determined with multiple video input terminal types for
comparison purposes, the entire procedure should be performed multiple times – each time
with a single set of input terminals selected – to ensure proper stability under each condition.
If available, a digital input port shall be used such as DisplayPort, HDMI or DVI. If not
available, a VGA input may be used.
If the UUT has audio capability but is not using a video interface that includes audio, an audio
signal shall be connected to selectable audio input terminals if available.
If the UUT has special functions that require data transfer via a USB port, then that port shall
also be connected to a USB port of a computer equipped with the appropriate drivers for the
special functions.
The selected input terminals shall be recorded.
6.2.4 Video signal, on-mode power consumption procedure
A video signal shall be selected for use during the on mode power consumption determination
procedure. The selection shall be made from one of the three following signals:
• static video signals as per 5.9.2,
• dynamic broadcast-content video signal (IEC 62087-2:2015, 4.1.2),
• internet-content video signal (IEC 62087-2:2015, 4.1.3).
The video signal selected for determining on-mode power consumption shall be recorded.
NOTE Information regarding the selection of the video signal for the On mode power consumption measurement
is available in IEC 62087-2:2015, Clause A.1.
6.2.5 Video format
The video resolution and frame rate of the signals applied to the UUT during the procedure
shall be selected. The selected resolution and frame rate shall be compatible with the input
terminal selected in 6.2.3.
The selected resolution and frame rate of the input signals shall be recorded.
NOTE The media available in IEC 62087-2:2015 is available in standard and high definition only. By limiting the
video source resolution to 1 920 × 1 080, this document ensures that the associated signals will be up-converted by
the UUT, avoiding the possibility of varying results from various external up-converters (see 6.3.10.6 of IEC 62087-
3:2015).
6.2.6 Automatic brightness control capabilities
There are three types of computer monitors with respect to ABC.
Computer monitors do not have an ABC feature.

Computer monitors have an ABC feature that is not enabled by default.
Computer monitors have an ABC feature that is enabled by default.
The presence of an ABC feature and whether or not the ABC feature is enabled by default
shall be recorded.
6.2.7 Automatic brightness control levels
The on-mode power consumption of computer monitors with the automatic brightness control
disabled by default in the default picture setting shall be determined with the ABC feature
disabled.
For computer monitors with the ABC feature enabled by default in the default picture setting,
the on-mode power consumptions shall be determined with the ABC feature enabled and/or
manually disabled. If the ABC feature is enabled, the on-mode power consumption shall be
determined over a minimum of one and a maximum of four different illuminance conditions
with respect to the ABC feature.
The state(s) of the ABC feature and the illuminance levels selected to be applied to the
ABC sensor shall be recorded.
NOTE The number of luminance levels to be used is normally specified in the requirements of various energy
efficiency programmes.
6.3 Initial activities
6.3.1 Order of initial activities
Figure 2 shows the order in which the initial activities shall be performed.
From Figure 1
6.3.3. Installation
6.3.2
6.3.4 Application of input signals
Cool
6.3.5 Luminance measuring device setup
down
6.3.6 Light source setup
6.3.7 Power on
6.3.8 Computer Monitor settings, including…
6.3.8.1 Default settings
6.3.8.2 Input source selection
6.3.8.3 Special functions
6.3.8.4 Video aspect ratio
6.3.8.5 Sound level adjustments
Return to Figure 1
IEC
Figure 2 – Order of initial activities

– 16 – IEC 62087-7:2018 © IEC 2018
6.3.2 Cool down
The UUT shall be in the off or disconnected mode for a minimum of one hour before the UUT
is powered on. To optimise the initial activities, Subclauses 6.3.3 to 6.3.8 may be performed
during the cool down period as indicated in Figure 2.
6.3.3 Installation
The UUT shall be installed in accordance with the manufacturer’s instructions.
In order to simplify the alignment of the light source, all four corners of the face of the UUT
should be equidistant from a vertical reference plane (e.g. a wall) and the bottom two corners
of the face of the UUT should be equidistant from a horizontal reference plane (e.g. a floor).
The environmental conditions (Subclause 5.3) and ambient light conditions (Subclause 5.4)
shall be confirmed. If a non-contact LMD is to be used and the ABC feature of the UUT cannot
be manually disabled via the on-screen menus of the UUT, ambient light conditions at the
nominal centre of the display area shall be confirmed in the off or disconnected mode with the
light source of 5.8 applied to the UUT.
6.3.4 Application of input signals
The video input signal selected in 6.2.3 and the audio signal described in IEC 62087-2:2015,
4.1.4 shall be applied to the respective input terminal(s) selected in 6.2.2. The video signal
shall be in the format selected in 6.2.5. In the case of measurement with the static video
signals, the full field colour bar video signal shall be used.
6.3.5 Luminance measuring device setup
The LMD shall be aligned perpendicular to the centre of the display area. If a non-contact
LMD is being used for testing, the LMD shall be at a distance capable of achieving the
accuracy required by 5.5.2. If a contact LMD is being used, especially with smaller display
sizes, it shall be ensured that the display area measured has a diameter at least as large as
the LMD sensor area and that the sensor of the contact LMD can be positioned without
overlap to neighbouring areas, otherwise a non-contact LMD shall be used.
6.3.6 Light source setup
Aside from the possible use of a 2-stop ND filter when applying low illuminance levels to the
ABC sensor assembly of the UUT, there shall be no obstructions (e.g. diffusing media,
IR filters, UV filters) between the lamp and the UUT’s automatic brightness control (ABC)
sensor assembly during power measurements.
The centre of the light source shall be aligned at a horizontal and vertical angle of 0° ± 5° with
respect to the surface of the ABC sensor assembly. The distance between the front of the
light source and the surface of the ABC sensor assembly shall be 1,5 m ± 0,1 m.
The ND filter, when used, shall be positioned immediately in front of the ABC sensor
assembly. The illumination levels shall be verified with the illuminance measuring instrument
positioned immediately in front of the ABC sensor assembly or immediately in front of the
ND filter.
No test room surface (i.e. floor, ceiling, and wall) shall be within a 0,5 m hemisphere in front
of the centre of the UUT’s ABC sensor; however, if the UUT ships with or has a built-in table
stand, the UUT may be set upon a table provided that table does not extend beyond the front
edge of the UUT/stand assembly (see Figure 3). The table should be covered with black felt
material.
Dimensions in metres
Nearest test
room surface
U
U
ABC
T
Sensor
Light
1,5 ±0,1
source
0° ±5°
Table (optional)
>0,5
Illuminance measuring
Table not beyond
instrument or ND filter
front of stand
immediately in front of
ABC sensor assembly
IEC
Figure 3 – Light source configuration
The illuminance level shall be varied by changing the voltage, and/or duty cycle of the light
source.
If the UUT includes multiple ABC sensors, each sensor shall be illuminated to the same level,
within the rated tolerance limits, and multiple light sources may be used.
6.3.7 Power
The UUT shall be connected to an external power source and shall be set in the on mode.
The requirements specified in IEC 62087-1:2015, 5.1.1.5 (on mode) apply.
6.3.8 Computer monitor settings
6.3.8.1 Default settings
For dynamic video measurements, the UUT shall remain or be set in accordance with 5.9.1.
For static pattern measurements, the UUT should be adjusted in accordance with 5.9.2.
6.3.8.2 Input source selection
The input terminals chosen in 6.2.3 shall be selected as the active source of picture and
sound generated by the UUT.
6.3.8.3 Special functions
Special functions not otherwise mentioned in Clause 6 shall be in the position adjusted by the
manufacturer for shipment to the end user.
6.3.8.4 Video size, aspect ratio, and resolution
The UUT shall be set such that the active area of the video input signal fills the entire display
area.
For dynamic video measurements, where the UUT has a display with a resolution higher than
1 920 pixels by 1 080 pixels and the UUT cannot be adjusted such that the video input signal
fills the entire display area, an external player with an up-conversion function should be used
in order to fill the entire display area.

– 18 – IEC 62087-7:2018 © IEC 2018
If any setting of the UUT is changed from the default in order to fill the entire display area, the
changed settings shall be recorded. The player used and its related settings shall be
recorded.
6.3.8.5 Sound level adjustments
Where present, the volume control shall be adjusted to a level at which the sound output is
just audible. If audibility cannot be confirmed, visual indication of the volume level on the on-
screen display shall be set to be between 8 % and 12 % of its maximum value.
NOTE The intent of the above requirement is to ensure that the sound circuitry in the UUT is active while keeping
sound pressure levels from the UUT low.
6.4 Determination of power consumption, on mode
6.4.1 Order of activities
To determine power consumption in the on mode, the order of activities shown in Figure 4
shall be followed.
6.4.2 Stabilization
In the case that ABC is disabled by default in the default picture setting, ABC shall be
disabled for the stabilization period. In the case that ABC is enabled by default in the default
picture setting, ABC shall remain enabled and 300 lux or greater shall be applied directly to
the ABC sensor using the light source of 5.8 for the duration of the stabilization period.
After the steps in 6.3
...