Audio/video, information and communication technology equipment - Part 1: Safety requirements

EN-IEC 62368-1 is a product safety standard that classifies energy sources, prescribes safeguards against those energy sources, and provides guidance on the application of, and requirements for, those safeguards. The prescribed safeguards are intended to reduce the likelihood of pain, injury and, in the case of fire, property damage. The objective of the INTRODUCTION is to help designers to understand the underlying principles of safety in order to design safe equipment. These principles are informative and not an alternative to the detailed requirements of this document.

Einrichtungen für Audio/Video-, Informations- und Kommunikationstechnik - Teil 1: Sicherheitsanforderungen

Equipements des technologies de l'audio/vidéo, de l'information et de la communication - Partie 1 : Exigences de sécurité.

Oprema za avdio/video, informacijsko in komunikacijsko tehnologijo - 1. del: Varnostne zahteve

General Information

Status
Published
Public Enquiry End Date
14-Apr-2019
Publication Date
14-Jun-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
12-Mar-2020
Due Date
17-May-2020
Completion Date
15-Jun-2020

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SLOVENSKI STANDARD
SIST EN IEC 62368-1:2020/A11:2020
01-julij-2020
Oprema za avdio/video, informacijsko in komunikacijsko tehnologijo - 1. del:
Varnostne zahteve
Audio/video, information and communication technology equipment - Part 1: Safety
requirements

Einrichtungen für Audio/Video-, Informations- und Kommunikationstechnik - Teil 1:

Sicherheitsanforderungen

Equipements des technologies de l'audio/vidéo, de l'information et de la communication -

Partie 1 : Exigences de sécurité.
Ta slovenski standard je istoveten z: EN IEC 62368-1:2020/A11:2020
ICS:
33.160.01 Avdio, video in avdiovizualni Audio, video and audiovisual
sistemi na splošno systems in general
35.020 Informacijska tehnika in Information technology (IT) in
tehnologija na splošno general
SIST EN IEC 62368-1:2020/A11:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 62368-1:2020/A11:2020
---------------------- Page: 2 ----------------------
SIST EN IEC 62368-1:2020/A11:2020
EUROPEAN STANDARD EN IEC 62368-1:2020/A11
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2020
ICS 35.020; 33.160.01
English Version
Audio/video, information and communication technology
equipment - Part 1: Safety requirements

Equipements des technologies de l'audio/vidéo, de Einrichtungen für Audio/Video-, Informations- und

l'information et de la communication - Partie 1 : Exigences Kommunikationstechnik - Teil 1: Sicherheitsanforderungen

de sécurité.

This amendment A11 modifies the European Standard EN IEC 62368-1:2020; it was approved by CENELEC on 2020-01-06. CENELEC

members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment the

status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the

responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as

the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62368-1:2020/A11:2020 E
---------------------- Page: 3 ----------------------
SIST EN IEC 62368-1:2020/A11:2020
EN IEC 62368-1:2020/A11:2020 (E)
European foreword

This document (EN IEC 62368-1:2020/A11:2020) has been prepared by CLC/TC 108X "Safety

of electronic equipment within the fields of Audio/Video, Information Technology and

Communication Technology".
This document amends EN IEC 62368-1:2020.
The following dates are fixed:
• latest date by which this document has to (dop) 2021-01-06
be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2023-01-06
standards conflicting with this document
have to be withdrawn

Clauses, subclauses, notes, tables, figures and annexes which are additional to those in

IEC 62368-1:2018 are prefixed “Z”.
---------------------- Page: 4 ----------------------
SIST EN IEC 62368-1:2020/A11:2020
EN IEC 62368-1:2020/A11:2020 (E)
1 Modification to Clause 3
Replace 3.3.19 of IEC 62368-1 with the following definitions:
3.3.19 Sound exposure
3.3.19.1
momentary exposure level, MEL

metric for estimating 1 s sound exposure level from the HD 483-1 S2 test signal applied to both

channels, based on EN 50332-1:2013, 4.2.
Note 1 to entry: MEL is measured as A-weighted levels in dB.
Note 2 to entry: See B.3 of EN 50332-3:2017 for additional information.
3.3.19.2
calculated sound dose, CSD

one week rolling estimate of sound exposure expressed in percent of the maximum regarded as

safe
Note 1 to entry: See B.4 of EN 50332-3:2017 for additional information.
3.3.19.3
sound exposure, E

A-weighted sound pressure (p) squared and integrated over a stated period of time, T

Note 1 to entry: The SI unit is Pa s.
3.3.19.4
sound exposure level, SEL
, typically the 1 kHz
logarithmic measure of sound exposure relative to a reference value, E0
threshold of hearing in humans.
Note 1 to entry: SEL is measured as A-weighted levels in dB.
dB
Note 2 to entry: See B.4 of EN 50332-3:2017 for additional information.
3.3.19.5
digital signal level relative to full scale, dBFS

levels reported in dBFS are always r.m.s. full scale levels; 0 dBFS, is the level of a dc-free

997 Hz sine wave whose undithered positive peak value is positive digital full scale, leaving the

code corresponding to negative digital full scale unused

Note 1 to entry: It is invalid to use dBFS for non-r.m.s. levels. Because the definition of full scale is based on a sine

wave, the level of signals with a crest factor lower than that of a sine wave may exceed 0 dBFS. In particular, square-

wave signals may reach +3,01 dBFS.
---------------------- Page: 5 ----------------------
SIST EN IEC 62368-1:2020/A11:2020
EN IEC 62368-1:2020/A11:2020 (E)
2 Modification to Clause 10
Replace 10.6 of IEC 62368-1 with the following:
10.6 Safeguards against acoustic energy sources
10.6.1 General
10.6.1.1 Introduction

Safeguard requirements for protection against long-term exposure to excessive sound pressure

levels from personal music players closely coupled to the ear are specified below. Requirements

for earphones and headphones intended for use with personal music players are also covered.

A personal music player is a portable equipment intended for use by an ordinary person, that:

– is designed to allow the user to listen to audio or audiovisual content / material; and

– uses a listening device, such as headphones or earphones that can be worn in or on or

around the ears; and

– has a player that can be body worn (of a size suitable to be carried in a clothing pocket) and

is intended for the user to walk around with while in continuous use (for example, on a street,

in a subway, at an airport, etc.).

EXAMPLES Portable CD players, MP3 audio players, mobile phones with MP3 type features, PDAs or similar

equipment.

Personal music players shall comply with the requirements of either 10.6.2 or 10.6.3.

NOTE 1 Protection against acoustic energy sources from telecom applications is referenced to ITU-T P.360.

NOTE 2 It is the intention of the Committee to allow the alternative methods for now, but to only use the dose

measurement method as given in 10.6.5 in future. Therefore, manufacturers are encouraged to implement 10.6.5 as

soon as possible.
Listening devices sold separately shall comply with the requirements of 10.6.6.
These requirements are valid for music or video mode only.
The requirements do not apply to:
– professional equipment;

NOTE 3 Professional equipment is equipment sold through special sales channels. All products sold through

normal electronics stores are considered not to be professional equipment.
– hearing aid equipment and other devices for assistive listening;
– the following type of analogue personal music players:

• long distance radio receiver (for example, a multiband radio receiver or world band radio

receiver, an AM radio receiver), and
• cassette player/recorder;

NOTE 4 This exemption has been allowed because this technology is falling out of use and it is expected that

within a few years it will no longer exist. This exemption will not be extended to other technologies.

– a player while connected to an external amplifier that does not allow the user to walk around

while in use.

For equipment that is clearly designed or intended primarily for use by children, the limits of the

relevant toy standards may apply.

The relevant requirements are given in EN 71-1:2011, 4.20 and the related tests methods and

measurement distances apply.
---------------------- Page: 6 ----------------------
SIST EN IEC 62368-1:2020/A11:2020
EN IEC 62368-1:2020/A11:2020 (E)
10.6.1.2 Non-ionizing radiation from radio frequencies in the range 0 to 300 GHz

The amount of non-ionizing radiation is regulated by European Council Recommendation 1999/519/EC of

12 July 1999 on the limitation of exposure of the general public to electromagnetic fields (0 Hz to 300

GHz).

For intentional radiators, ICNIRP guidelines should be taken into account for Limiting Exposure to Time-

Varying Electric, Magnetic, and Electromagnetic Fields (up to 300 GHz). For hand-held and body-

mounted devices, attention is drawn to EN 50360 and EN 50566.
10.6.2 Classification of devices without the capacity to estimate sound dose
10.6.2.1 General

This standard is transitioning from short-term based (30 s) requirements to long-term based

(40 h) requirements. These clauses remain in effect only for devices that do not comply with

sound dose estimation as stipulated in EN 50332-3.

For classifying the acoustic output L , , measurements are based on the A-weighted equivalent

Aeq
sound pressure level over a 30 s period.

For music where the average sound pressure (long term L , ) measured over the duration of

Aeq

the song is lower than the average produced by the programme simulation noise, measurements

may be done over the duration of the complete song. In this case, T becomes the duration of the

song.

NOTE Classical music, acoustic music and broadcast typically has an average sound pressure (long term L , )

Aeq

which is much lower than the average programme simulation noise. Therefore, if the player is capable to analyse the

content and compare it with the programme simulation noise, the warning does not need to be given as long as the

average sound pressure of the song does not exceed the required limit.

For example, if the player is set with the programme simulation noise to 85 dB, but the average music level of the song

is only 65 dB, there is no need to give a warning or ask an acknowledgement as long as the average sound level of the

song is not above the basic limit of 85 dB.
10.6.2.2 RS1 limits (to be superseded, see 10.6.3.2)
RS1 is a class 1 acoustic energy source that does not exceed the following:

– for equipment provided as a package (player with its listening device), and with a proprietary

connector between the player and its listening device, or where the combination of player and

listening device is known by other means such as setting or automatic detection, the L ,

Aeq

acoustic output shall be ≤ 85 dB when playing the fixed “programme simulation noise”

described in EN 50332-1.

– for equipment provided with a standardized connector (for example, a 3,5 phone jack) that

allows connection to a listening device for general use, the unweighted r.m.s. output voltage

shall be ≤ 27 mV (analogue interface) or -25 dBFS (digital interface) when playing the fixed

“programme simulation noise” described in EN 50332-1.
– The RS1 limits will be updated for all devices as per 10.6.3.2.
10.6.2.3 RS2 limits (to be superseded, see 10.6.3.3)
RS2 is a class 2 acoustic energy source that does not exceed the following:

– for equipment provided as a package (player with its listening device), and with a proprietary

connector between the player and its listening device, or when the combination of player and

---------------------- Page: 7 ----------------------
SIST EN IEC 62368-1:2020/A11:2020
EN IEC 62368-1:2020/A11:2020 (E)

listening device is known by other means such as setting or automatic detection, the L ,

Aeq

acoustic output shall be ≤ 100 dB(A) when playing the fixed “programme simulation noise” as

described in EN 50332-1.

– for equipment provided with a standardized connector (for example, a 3,5 phone jack) that

allows connection to a listening device for general use, the unweighted r.m.s. output voltage

shall be ≤ 150 mV (analogue interface) or -10 dBFS (digital interface) when playing the fixed

“programme simulation noise” as described in EN 50332-1.
10.6.2.4 RS3 limits
RS3 is a class 3 acoustic energy source that exceeds RS2 limits.
10.6.3 Classification of devices (new)
10.6.3.1 General

Previous limits (10.6.2) created abundant false negative and false positive PMP sound level

warnings. New limits, compliant with The Commission Decision of 23 June 2009, are given

below.
10.6.3.2 RS1 limits (new)
RS1 is a class 1 acoustic energy source that does not exceed the following:

– for equipment provided as a package (player with its listening device), and with a proprietary

connector between the player and its listening device, or where the combination of player and

listening device is known by other means such as setting or automatic detection, the L ,

Aeq

acoustic output shall be ≤ 80 dB when playing the fixed “programme simulation noise”

described in EN 50332-1.

– for equipment provided with a standardized connector (for example, a 3,5 phone jack) that

allows connection to a listening device for general use, the unweighted r.m.s. output voltage

shall be ≤ 15 mV (analogue interface) or -30 dBFS (digital interface) when playing the fixed

“programme simulation noise” described in EN 50332-1.
10.6.3.3 RS2 limits (new)
RS2 is a class 2 acoustic energy source that does not exceed the following:

– for equipment provided as a package (player with its listening device), and with a proprietary

connector between the player and its listening device, or where the combination of player and

listening device is known by other means such as setting or automatic detection, the weekly

sound exposure level, as described in EN 50332-3, shall be ≤ 80 dB when playing the fixed

"programme simulation noise" described in EN 50332-1.

– for equipment provided with a standardized connector (for example, a 3,5 phone jack) that

allows connection to a listening device for general use, the unweighted r.m.s. output level,

integrated over one week, as described in EN 50332-3, shall be ≤ 15 mV (analogue interface)

or -30 dBFS (digital interface) when playing the fixed “programme simulation noise” described

in EN 50332-1.
10.6.4 Requirements for maximum sound exposure
10.6.4.1 Measurement methods
All volume controls shall be turned to maximum during tests.

Measurements shall be made in accordance with EN 50332-1 or EN 50332-2 as applicable.

---------------------- Page: 8 ----------------------
SIST EN IEC 62368-1:2020/A11:2020
EN IEC 62368-1:2020/A11:2020 (E)
10.6.4.2 Protection of persons

Except as given below, protection requirements for parts accessible to ordinary persons,

instructed persons and skilled persons are given in 4.3.
NOTE 1 Volume control is not considered a safeguard.
Between RS2 and an ordinary person, the basic safeguard may be replaced by an

instructional safeguard in accordance with Clause F.5, except that the instructional

safeguard shall be placed on the equipment, or on the packaging, or in the instruction manual.

Alternatively, the instructional safeguard may be given through the equipment display during

use.
The elements of the instructional safeguard shall be as follows:
– element 1a: the symbol , IEC 60417-6044 (2011-01)
– element 2: “High sound pressure” or equivalent wording
– element 3: “Hearing damage risk” or equivalent wording

– element 4: “Do not listen at high volume levels for long periods.” or equivalent wording

An equipment safeguard shall prevent exposure of an ordinary person to an RS2 source

without intentional physical action from the ordinary person and shall automatically return to an

output level not exceeding what is specified for an RS1 source when the power is switched off.

The equipment shall provide a means to actively inform the user of the increased sound level

when the equipment is operated with an output exceeding RS1. Any means used shall be

acknowledged by the user before activating a mode of operation which allows for an output

exceeding RS1. The acknowledgement does not need to be repeated more than once every 20 h

of cumulative listening time.

NOTE 2 Examples of means include visual or audible signals. Action from the user is always needed.

NOTE 3 The 20 h listening time is the accumulative listening time, independent of how often and how long the

personal music player has been switched off.
A skilled person shall not be unintentionally exposed to RS3.
10.6.5 Requirements for dose-based systems
10.6.5.1 General requirements

Personal music players shall give the warnings as provided below when tested according to

EN 50332-3, using the limits from this clause.

The manufacturer may offer optional settings to allow the users to modify when and how they

wish to receive the notifications and warnings to promote a better user experience without

defeating the safeguards. This allows the users to be informed in a method that best meets their

physical capabilities and device usage needs. If such optional settings are offered, an

administrator (for example, parental restrictions, business/educational administrators, etc.) shall

be able to lock any optional settings into a specific configuration.

The personal music player shall be supplied with easy to understand explanation to the user of

the dose management system, the risks involved, and how to use the system safely. The user

shall be made aware that other sources may significantly contribute to their sound exposure, for

example work, transportation, concerts, clubs, cinema, car races, etc.
---------------------- Page: 9 ----------------------
SIST EN IEC 62368-1:2020/A11:2020
EN IEC 62368-1:2020/A11:2020 (E)
10.6.5.2 Dose-based warning and requirements

When a dose of 100 % CSD is reached, and at least at every 100 % further increase of CSD, the

device shall warn the user and require an acknowledgement. In case the user does not

acknowledge, the output level shall automatically decrease to compliance with class RS1.

The warning shall at least clearly indicate that listening above 100 % CSD leads to the risk of

hearing damage or loss.
10.6.5.3 Exposure-based requirements

With only dose-based requirements, cause and effect could be far separated in time, defying the

purpose of educating users about safe listening practice. In addition to dose-based requirements,

a PMP shall therefore also put a limit to the short-term sound level a user can listen at.

The exposure-based limiter (EL) shall automatically reduce the sound level not to exceed

100 dB(A) or 150 mV integrated over the past 180 s, based on methodology defined in EN

50332-3. The EL settling time (time from starting level reduction to reaching target output) shall

be 10 s or faster.

Test of EL functionality is conducted according to EN 50332-3, using the limits from this clause.

For equipment provided as a package (player with its listening device), the level integrated over

180 s shall be 100 dB or lower. For equipment provided with a standardized connector, the un-

weighted level integrated over 180 s shall be no more than 150 mV for an analogue interface and

no more than -10 dBFS for a digital interface.

NOTE In case the source is known not to be music (or test signal), the EL may be disabled.

10.6.6 Requirements for listening devices (headphones, earphones, etc.)
10.6.6.1 Corded listening devices with analogue input

With 94 dB L acoustic pressure output of the listening device, and with the volume and sound

Aeq

settings in the listening device (for example, built-in volume level control, additional sound

features like equalization, etc.) set to the combination of positions that maximize the measured

acoustic output, the input voltage of the listening device when playing the fixed “programme

simulation noise” as described in EN 50332-1 shall be ≥ 75 mV.

NOTE The values of 94 dB and 75 mV correspond with 85 dB and 27 mV or 100 dB and 150 mV.

10.6.6.2 Corded listening devices with digital input

With any playing device playing the fixed “programme simulation noise” described in

EN 50332-1, and with the volume and sound settings in the listening device (for example, built-in

volume level control, additional sound features like equalization, etc.) set to the combination of

positions that maximize the measured acoustic output, the L , acoustic output of the listening

Aeq
device shall be ≤ 100 dB with an input signal of -10 dBFS.
---------------------- Page: 10 ----------------------
SIST EN IEC 62368-1:2020/A11:2020
EN IEC 62368-1:2020/A11:2020 (E)
10.6.6.3 Cordless listening devices
In cordless mode,

– with any playing and transmitting device playing the fixed programme simulation noise

described in EN
...

SLOVENSKI STANDARD
SIST EN IEC 62368-1:2019/A11:2020
01-julij-2020
Oprema za avdio/video, informacijsko in komunikacijsko tehnologijo - 1. del:
Varnostne zahteve
Audio/video, information and communication technology equipment - Part 1: Safety
requirements

Einrichtungen für Audio/Video-, Informations- und Kommunikationstechnik - Teil 1:

Sicherheitsanforderungen

Equipements des technologies de l'audio/vidéo, de l'information et de la communication -

Partie 1 : Exigences de sécurité.
Ta slovenski standard je istoveten z: EN IEC 62368-1:2020/A11:2020
ICS:
33.160.01 Avdio, video in avdiovizualni Audio, video and audiovisual
sistemi na splošno systems in general
35.020 Informacijska tehnika in Information technology (IT) in
tehnologija na splošno general
SIST EN IEC 62368-1:2019/A11:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 62368-1:2019/A11:2020
---------------------- Page: 2 ----------------------
SIST EN IEC 62368-1:2019/A11:2020
EUROPEAN STANDARD EN IEC 62368-1:2020/A11
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2020
ICS 35.020; 33.160.01
English Version
Audio/video, information and communication technology
equipment - Part 1: Safety requirements

Equipements des technologies de l'audio/vidéo, de Einrichtungen für Audio/Video-, Informations- und

l'information et de la communication - Partie 1 : Exigences Kommunikationstechnik - Teil 1: Sicherheitsanforderungen

de sécurité.

This amendment A11 modifies the European Standard EN IEC 62368-1:2020; it was approved by CENELEC on 2020-01-06. CENELEC

members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment the

status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the

responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as

the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62368-1:2020/A11:2020 E
---------------------- Page: 3 ----------------------
SIST EN IEC 62368-1:2019/A11:2020
EN IEC 62368-1:2020/A11:2020 (E)
European foreword

This document (EN IEC 62368-1:2020/A11:2020) has been prepared by CLC/TC 108X "Safety

of electronic equipment within the fields of Audio/Video, Information Technology and

Communication Technology".
This document amends EN IEC 62368-1:2020.
The following dates are fixed:
• latest date by which this document has to (dop) 2021-01-06
be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2023-01-06
standards conflicting with this document
have to be withdrawn

Clauses, subclauses, notes, tables, figures and annexes which are additional to those in

IEC 62368-1:2018 are prefixed “Z”.
---------------------- Page: 4 ----------------------
SIST EN IEC 62368-1:2019/A11:2020
EN IEC 62368-1:2020/A11:2020 (E)
1 Modification to Clause 3
Replace 3.3.19 of IEC 62368-1 with the following definitions:
3.3.19 Sound exposure
3.3.19.1
momentary exposure level, MEL

metric for estimating 1 s sound exposure level from the HD 483-1 S2 test signal applied to both

channels, based on EN 50332-1:2013, 4.2.
Note 1 to entry: MEL is measured as A-weighted levels in dB.
Note 2 to entry: See B.3 of EN 50332-3:2017 for additional information.
3.3.19.2
calculated sound dose, CSD

one week rolling estimate of sound exposure expressed in percent of the maximum regarded as

safe
Note 1 to entry: See B.4 of EN 50332-3:2017 for additional information.
3.3.19.3
sound exposure, E

A-weighted sound pressure (p) squared and integrated over a stated period of time, T

Note 1 to entry: The SI unit is Pa s.
3.3.19.4
sound exposure level, SEL
, typically the 1 kHz
logarithmic measure of sound exposure relative to a reference value, E0
threshold of hearing in humans.
Note 1 to entry: SEL is measured as A-weighted levels in dB.
dB
Note 2 to entry: See B.4 of EN 50332-3:2017 for additional information.
3.3.19.5
digital signal level relative to full scale, dBFS

levels reported in dBFS are always r.m.s. full scale levels; 0 dBFS, is the level of a dc-free

997 Hz sine wave whose undithered positive peak value is positive digital full scale, leaving the

code corresponding to negative digital full scale unused

Note 1 to entry: It is invalid to use dBFS for non-r.m.s. levels. Because the definition of full scale is based on a sine

wave, the level of signals with a crest factor lower than that of a sine wave may exceed 0 dBFS. In particular, square-

wave signals may reach +3,01 dBFS.
---------------------- Page: 5 ----------------------
SIST EN IEC 62368-1:2019/A11:2020
EN IEC 62368-1:2020/A11:2020 (E)
2 Modification to Clause 10
Replace 10.6 of IEC 62368-1 with the following:
10.6 Safeguards against acoustic energy sources
10.6.1 General
10.6.1.1 Introduction

Safeguard requirements for protection against long-term exposure to excessive sound pressure

levels from personal music players closely coupled to the ear are specified below. Requirements

for earphones and headphones intended for use with personal music players are also covered.

A personal music player is a portable equipment intended for use by an ordinary person, that:

– is designed to allow the user to listen to audio or audiovisual content / material; and

– uses a listening device, such as headphones or earphones that can be worn in or on or

around the ears; and

– has a player that can be body worn (of a size suitable to be carried in a clothing pocket) and

is intended for the user to walk around with while in continuous use (for example, on a street,

in a subway, at an airport, etc.).

EXAMPLES Portable CD players, MP3 audio players, mobile phones with MP3 type features, PDAs or similar

equipment.

Personal music players shall comply with the requirements of either 10.6.2 or 10.6.3.

NOTE 1 Protection against acoustic energy sources from telecom applications is referenced to ITU-T P.360.

NOTE 2 It is the intention of the Committee to allow the alternative methods for now, but to only use the dose

measurement method as given in 10.6.5 in future. Therefore, manufacturers are encouraged to implement 10.6.5 as

soon as possible.
Listening devices sold separately shall comply with the requirements of 10.6.6.
These requirements are valid for music or video mode only.
The requirements do not apply to:
– professional equipment;

NOTE 3 Professional equipment is equipment sold through special sales channels. All products sold through

normal electronics stores are considered not to be professional equipment.
– hearing aid equipment and other devices for assistive listening;
– the following type of analogue personal music players:

• long distance radio receiver (for example, a multiband radio receiver or world band radio

receiver, an AM radio receiver), and
• cassette player/recorder;

NOTE 4 This exemption has been allowed because this technology is falling out of use and it is expected that

within a few years it will no longer exist. This exemption will not be extended to other technologies.

– a player while connected to an external amplifier that does not allow the user to walk around

while in use.

For equipment that is clearly designed or intended primarily for use by children, the limits of the

relevant toy standards may apply.

The relevant requirements are given in EN 71-1:2011, 4.20 and the related tests methods and

measurement distances apply.
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10.6.1.2 Non-ionizing radiation from radio frequencies in the range 0 to 300 GHz

The amount of non-ionizing radiation is regulated by European Council Recommendation 1999/519/EC of

12 July 1999 on the limitation of exposure of the general public to electromagnetic fields (0 Hz to 300

GHz).

For intentional radiators, ICNIRP guidelines should be taken into account for Limiting Exposure to Time-

Varying Electric, Magnetic, and Electromagnetic Fields (up to 300 GHz). For hand-held and body-

mounted devices, attention is drawn to EN 50360 and EN 50566.
10.6.2 Classification of devices without the capacity to estimate sound dose
10.6.2.1 General

This standard is transitioning from short-term based (30 s) requirements to long-term based

(40 h) requirements. These clauses remain in effect only for devices that do not comply with

sound dose estimation as stipulated in EN 50332-3.

For classifying the acoustic output L , , measurements are based on the A-weighted equivalent

Aeq
sound pressure level over a 30 s period.

For music where the average sound pressure (long term L , ) measured over the duration of

Aeq

the song is lower than the average produced by the programme simulation noise, measurements

may be done over the duration of the complete song. In this case, T becomes the duration of the

song.

NOTE Classical music, acoustic music and broadcast typically has an average sound pressure (long term L , )

Aeq

which is much lower than the average programme simulation noise. Therefore, if the player is capable to analyse the

content and compare it with the programme simulation noise, the warning does not need to be given as long as the

average sound pressure of the song does not exceed the required limit.

For example, if the player is set with the programme simulation noise to 85 dB, but the average music level of the song

is only 65 dB, there is no need to give a warning or ask an acknowledgement as long as the average sound level of the

song is not above the basic limit of 85 dB.
10.6.2.2 RS1 limits (to be superseded, see 10.6.3.2)
RS1 is a class 1 acoustic energy source that does not exceed the following:

– for equipment provided as a package (player with its listening device), and with a proprietary

connector between the player and its listening device, or where the combination of player and

listening device is known by other means such as setting or automatic detection, the L ,

Aeq

acoustic output shall be ≤ 85 dB when playing the fixed “programme simulation noise”

described in EN 50332-1.

– for equipment provided with a standardized connector (for example, a 3,5 phone jack) that

allows connection to a listening device for general use, the unweighted r.m.s. output voltage

shall be ≤ 27 mV (analogue interface) or -25 dBFS (digital interface) when playing the fixed

“programme simulation noise” described in EN 50332-1.
– The RS1 limits will be updated for all devices as per 10.6.3.2.
10.6.2.3 RS2 limits (to be superseded, see 10.6.3.3)
RS2 is a class 2 acoustic energy source that does not exceed the following:

– for equipment provided as a package (player with its listening device), and with a proprietary

connector between the player and its listening device, or when the combination of player and

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listening device is known by other means such as setting or automatic detection, the L ,

Aeq

acoustic output shall be ≤ 100 dB(A) when playing the fixed “programme simulation noise” as

described in EN 50332-1.

– for equipment provided with a standardized connector (for example, a 3,5 phone jack) that

allows connection to a listening device for general use, the unweighted r.m.s. output voltage

shall be ≤ 150 mV (analogue interface) or -10 dBFS (digital interface) when playing the fixed

“programme simulation noise” as described in EN 50332-1.
10.6.2.4 RS3 limits
RS3 is a class 3 acoustic energy source that exceeds RS2 limits.
10.6.3 Classification of devices (new)
10.6.3.1 General

Previous limits (10.6.2) created abundant false negative and false positive PMP sound level

warnings. New limits, compliant with The Commission Decision of 23 June 2009, are given

below.
10.6.3.2 RS1 limits (new)
RS1 is a class 1 acoustic energy source that does not exceed the following:

– for equipment provided as a package (player with its listening device), and with a proprietary

connector between the player and its listening device, or where the combination of player and

listening device is known by other means such as setting or automatic detection, the L ,

Aeq

acoustic output shall be ≤ 80 dB when playing the fixed “programme simulation noise”

described in EN 50332-1.

– for equipment provided with a standardized connector (for example, a 3,5 phone jack) that

allows connection to a listening device for general use, the unweighted r.m.s. output voltage

shall be ≤ 15 mV (analogue interface) or -30 dBFS (digital interface) when playing the fixed

“programme simulation noise” described in EN 50332-1.
10.6.3.3 RS2 limits (new)
RS2 is a class 2 acoustic energy source that does not exceed the following:

– for equipment provided as a package (player with its listening device), and with a proprietary

connector between the player and its listening device, or where the combination of player and

listening device is known by other means such as setting or automatic detection, the weekly

sound exposure level, as described in EN 50332-3, shall be ≤ 80 dB when playing the fixed

"programme simulation noise" described in EN 50332-1.

– for equipment provided with a standardized connector (for example, a 3,5 phone jack) that

allows connection to a listening device for general use, the unweighted r.m.s. output level,

integrated over one week, as described in EN 50332-3, shall be ≤ 15 mV (analogue interface)

or -30 dBFS (digital interface) when playing the fixed “programme simulation noise” described

in EN 50332-1.
10.6.4 Requirements for maximum sound exposure
10.6.4.1 Measurement methods
All volume controls shall be turned to maximum during tests.

Measurements shall be made in accordance with EN 50332-1 or EN 50332-2 as applicable.

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10.6.4.2 Protection of persons

Except as given below, protection requirements for parts accessible to ordinary persons,

instructed persons and skilled persons are given in 4.3.
NOTE 1 Volume control is not considered a safeguard.
Between RS2 and an ordinary person, the basic safeguard may be replaced by an

instructional safeguard in accordance with Clause F.5, except that the instructional

safeguard shall be placed on the equipment, or on the packaging, or in the instruction manual.

Alternatively, the instructional safeguard may be given through the equipment display during

use.
The elements of the instructional safeguard shall be as follows:
– element 1a: the symbol , IEC 60417-6044 (2011-01)
– element 2: “High sound pressure” or equivalent wording
– element 3: “Hearing damage risk” or equivalent wording

– element 4: “Do not listen at high volume levels for long periods.” or equivalent wording

An equipment safeguard shall prevent exposure of an ordinary person to an RS2 source

without intentional physical action from the ordinary person and shall automatically return to an

output level not exceeding what is specified for an RS1 source when the power is switched off.

The equipment shall provide a means to actively inform the user of the increased sound level

when the equipment is operated with an output exceeding RS1. Any means used shall be

acknowledged by the user before activating a mode of operation which allows for an output

exceeding RS1. The acknowledgement does not need to be repeated more than once every 20 h

of cumulative listening time.

NOTE 2 Examples of means include visual or audible signals. Action from the user is always needed.

NOTE 3 The 20 h listening time is the accumulative listening time, independent of how often and how long the

personal music player has been switched off.
A skilled person shall not be unintentionally exposed to RS3.
10.6.5 Requirements for dose-based systems
10.6.5.1 General requirements

Personal music players shall give the warnings as provided below when tested according to

EN 50332-3, using the limits from this clause.

The manufacturer may offer optional settings to allow the users to modify when and how they

wish to receive the notifications and warnings to promote a better user experience without

defeating the safeguards. This allows the users to be informed in a method that best meets their

physical capabilities and device usage needs. If such optional settings are offered, an

administrator (for example, parental restrictions, business/educational administrators, etc.) shall

be able to lock any optional settings into a specific configuration.

The personal music player shall be supplied with easy to understand explanation to the user of

the dose management system, the risks involved, and how to use the system safely. The user

shall be made aware that other sources may significantly contribute to their sound exposure, for

example work, transportation, concerts, clubs, cinema, car races, etc.
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10.6.5.2 Dose-based warning and requirements

When a dose of 100 % CSD is reached, and at least at every 100 % further increase of CSD, the

device shall warn the user and require an acknowledgement. In case the user does not

acknowledge, the output level shall automatically decrease to compliance with class RS1.

The warning shall at least clearly indicate that listening above 100 % CSD leads to the risk of

hearing damage or loss.
10.6.5.3 Exposure-based requirements

With only dose-based requirements, cause and effect could be far separated in time, defying the

purpose of educating users about safe listening practice. In addition to dose-based requirements,

a PMP shall therefore also put a limit to the short-term sound level a user can listen at.

The exposure-based limiter (EL) shall automatically reduce the sound level not to exceed

100 dB(A) or 150 mV integrated over the past 180 s, based on methodology defined in EN

50332-3. The EL settling time (time from starting level reduction to reaching target output) shall

be 10 s or faster.

Test of EL functionality is conducted according to EN 50332-3, using the limits from this clause.

For equipment provided as a package (player with its listening device), the level integrated over

180 s shall be 100 dB or lower. For equipment provided with a standardized connector, the un-

weighted level integrated over 180 s shall be no more than 150 mV for an analogue interface and

no more than -10 dBFS for a digital interface.

NOTE In case the source is known not to be music (or test signal), the EL may be disabled.

10.6.6 Requirements for listening devices (headphones, earphones, etc.)
10.6.6.1 Corded listening devices with analogue input

With 94 dB L acoustic pressure output of the listening device, and with the volume and sound

Aeq

settings in the listening device (for example, built-in volume level control, additional sound

features like equalization, etc.) set to the combination of positions that maximize the measured

acoustic output, the input voltage of the listening device when playing the fixed “programme

simulation noise” as described in EN 50332-1 shall be ≥ 75 mV.

NOTE The values of 94 dB and 75 mV correspond with 85 dB and 27 mV or 100 dB and 150 mV.

10.6.6.2 Corded listening devices with digital input

With any playing device playing the fixed “programme simulation noise” described in

EN 50332-1, and with the volume and sound settings in the listening device (for example, built-in

volume level control, additional sound features like equalization, etc.) set to the combination of

positions that maximize the measured acoustic output, the L , acoustic output of the listening

Aeq
device shall be ≤ 100 dB with an input signal of -10 dBFS.
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10.6.6.3 Cordless listening devices
In cordless mode,

– with any playing and transmitting device playing the fixed programme simulation noise

described in EN
...

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