Environmental testing - Part 1: General and guidance

The IEC 60068 series includes a series of methods for environmental testing along with their appropriate severities, and prescribes various atmospheric conditions for measurements and tests designed to assess the ability of specimens to perform under expected conditions of transportation, storage and all aspects of operational use. Although primarily intended for electrotechnical products, this standard is not restricted to them and may be used in other fields where desired. Other methods of environmental testing, specific to the individual types of specimen, may be included in the relevant specifications. The framework of environmental test tailoring process is given in order to assist the production of test specifications with appropriate tests and test severities. The IEC 60068 series provides a series of uniform and reproducible environmental, climatic, dynamic and combined tests, performed and measured under standard atmospheric conditions, for those preparing specifications and those engaged in the testing of products. These test methods are based upon available international engineering experience and judgement and are primarily designed to provide information on the following properties of specimens:
a) the ability to operate within specified limits of temperature, pressure, humidity, mechanical stress or other environmental conditions and combinations of these conditions;
b) the ability to withstand conditions of transportation, storage and installation.
NOTE 1 The IEC 60721 series provides a system for classification of environmental conditions and gives relevant definitions. The tests in this standard permit the comparison of the performance of sample products. To assess the quality or useful life of a given production lot, the test methods should be applied in accordance with a suitable sampling plan and may be supplemented by appropriate additional tests, if necessary. NOTE 2 ISO defines “quality” as the degree to which a set of inherent characteristics fulfils requirements.. NOTE 3 "Useful life": under given conditions, the time interval beginning, at a given instant of time, and ending when the failure intensity becomes unacceptable or when the item is considered unrepairable as a result of a fault. To provide tests appropriate to the different intensities of an environmental condition, some of the test procedures have a number of degrees of severity. These different degrees of severity are obtained by varying the time, temperature, air pressure or some other determining factor, separately or in combination. As the tests and their degrees of severity should be based on real environmental conditions that a particular specimen might encounter, the framework and the necessary phases for the environmental test tailoring process are provided. The test tailoring process may be used to produce the required relevant test specification for the particular specimen.

Umweltprüfungen - Teil 1: Allgemeines und Leitfaden

Essais d'environnement - Partie 1: Généralités et guide

La CEI 60068-1:2013 comporte une série de méthodes d'essais d'environnement et leurs sévérités appropriées et spécifie différentes conditions atmosphériques pour les mesures et les essais, conçues pour garantir l'aptitude de spécimens à être utilisés dans des conditions prévisibles de transport, de stockage et d'utilisation opérationnelle sous toutes ses formes. Bien qu'elle soit destinée en premier lieu à des produits électrotechniques, la présente norme ne s'applique pas uniquement à ceux-ci et peut être utilisée dans d'autres domaines, si on le désire. D'autres méthodes d'essais d'environnement, spécifiques à des types particuliers de spécimens, peuvent être incluses dans la spécification particulière correspondante. Le cadre du processus d'adaptation des essais d'environnement est donné afin d'aider à l'établissement de spécifications d'essai proposant des essais et des sévérités appropriés. Cette septième édition annule et remplace la sixième édition, publiée en 1988, et constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - une liste de références normatives mise à jour; - une indication des annexes normatives et informatives; - Une nouvelle Annexe informative - Annexe C: 'Adaptation des essais d'environnement'.

Okoljsko preskušanje - 1. del: Splošno in navodila

Serija standardov IEC 60068 vključuje niz metod za okoljsko preskušanje z ustreznimi stopnjami ter predpisuje različne atmosferske pogoje za meritve in preskuse, ki so bili zasnovani za vrednotenje zmožnosti delovanja preskusnih vzorcev v pričakovanih pogojih med transportom in skladiščenjem ter v vseh vidikih operativne uporabe. Čeprav je primarno namenjen elektrotehničnim izdelkom, ta standard ni omejen nanje in se lahko poljubno uporablja na drugih področjih. Druge metode okoljskega preskušanja, ki so značilne za individualne tipe preskusnih vzorcev, so morda vključene v ustreznih specifikacijah. Okvir za postopek prilagajanja okoljskega preskušanja je podan kot pomoč pri izdelavi preskusnih specifikacij z ustreznimi preskusi in preskusnimi stopnjami. Serija standardov IEC 60068 navaja niz enotnih in ponovljivih okoljskih, klimatskih, dinamičnih in kombiniranih preskusov, ki se izvedejo in izmerijo v standardnih atmosferskih pogojih, za tiste, ki pripravljajo specifikacije, in za tiste, ki se ukvarjajo s preskušanjem izdelkov. Te preskusne metode temeljijo na razpoložljivih mednarodnih inženirskih izkušnjah in presoji ter so prvenstveno zasnovane za zagotavljanje informacij o naslednjih lastnostih preskusnih vzorcev:
a) zmožnost delovanja v okviru določenih mejnih vrednosti temperature, tlaka, vlažnosti, mehanskih vplivov ali drugih okoljskih pogojev in kombinacij teh pogojev;
b) zmožnost odpornosti na pogoje transporta, shranjevanja in namestitve.
OPOMBA 1 Serija standardov IEC 60721 navaja sistem za razvrščanje okoljskih pogojev in vsebuje ustrezne definicije. Preskusi v tem standardu omogočajo primerjavo zmožnosti delovanja vzorčnih izdelkov. Za ocenjevanje kakovosti ali življenjske dobe dane proizvodne serije se morajo preskusne metode uporabljati v skladu s primernim načrtom vzorčenja in se lahko po potrebi nadgradijo z ustreznimi dodatnimi preskusi. OPOMBA 2 Standard ISO določa »kakovost« kot stopnjo, do katere nabor svojstvenih lastnosti izpolnjuje zahteve. OPOMBA 3 »Življenjska doba«: v danih pogojih je to časovno obdobje, ki se začne ob točno določenem času in konča, ko postane pogostost odpovedi izdelka nesprejemljiva ali ko izdelka zaradi okvare ni več mogoče popraviti. Nekateri preskusni postopki imajo več stopenj, da se zagotovijo preskusi, ki so primerni za različne stopnje intenzivnosti okoljskih pogojev. Te različne stopnje se pridobijo s spreminjanjem časa, temperature, zračnega tlaka ali katerih drugih odločilnih dejavnikov, ločeno ali v kombinaciji. Ker morajo preskusi in stopnje temeljiti na resničnih okoljskih pogojih, na katere lahko določeni preskusni vzorec naleti, so navedeni okvir in potrebne faze za postopek prilagajanja okoljskega preskušanja. Postopek za prilagajanje preskušanja se lahko uporabi za izdelavo zahtevanih ustreznih preskusnih specifikacij za določeni preskusni vzorec.

General Information

Status
Published
Publication Date
15-Apr-2014
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
31-Mar-2014
Due Date
05-Jun-2014
Completion Date
16-Apr-2014

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SLOVENSKI STANDARD
SIST EN 60068-1:2014
01-maj-2014
Okoljsko preskušanje - 1. del: Splošno in navodila
Environmental testing - Part 1: General and guidance
Umweltprüfungen - Teil 1: Allgemeines und Leitfaden
Essais d'environnement - Partie 1: Généralités et guide
Ta slovenski standard je istoveten z: EN 60068-1:2014
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
SIST EN 60068-1:2014 en

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

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SIST EN 60068-1:2014
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SIST EN 60068-1:2014
EUROPEAN STANDARD
EN 60068-1
NORME EUROPÉENNE
March 2014
EUROPÄISCHE NORM
ICS 19.040 Supersedes EN 60068-1:1994
English version
Environmental testing -
Part 1: General and guidance
(IEC 60068-1:2013)
Essais d'environnement - Umgebungseinflüsse -
Partie 1: Généralités et lignes directrices Teil 1: Allgemeines und Leitfaden
(CEI 60068-1:2013) (IEC 60068-1:2013)

This European Standard was approved by CENELEC on 2013-11-11. CENELEC members are bound to comply

with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration.

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

application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and notified

to the 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, Former Yugoslav Republic of Macedonia, France, Germany,

Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,

Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2014 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60068-1:2014 E
---------------------- Page: 3 ----------------------
SIST EN 60068-1:2014
EN 60068-1:2014 - 2 -
Foreword

The text of document 104/618/FDIS, future edition 7 of IEC 60068-1, prepared by IEC/TC 104

"Environmental conditions, classification and methods of test" was submitted to the IEC-CENELEC

parallel vote and approved by CENELEC as EN 60068-1:2014.
The following dates are fixed:
– latest date by which the document has to be implemented at (dop) 2014-09-21
national level by publication of an identical national
standard or by endorsement
– latest date by which the national standards conflicting with (dow) 2016-11-11
the document have to be withdrawn
This document supersedes EN 60068-1:1994.

EN 60068-1:2014 includes the following significant technical changes with respect to

EN 60068-1:1994:
– updated normative reference list;
– indication of normative and informative annexes;
– new informative Annex C, Environmental test tailoring.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.
Endorsement notice

The text of the International Standard IEC 60068-1:2013 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60068-2-14 NOTE Harmonized as EN 60068-2-14.
IEC 60068-2-20 NOTE Harmonized as EN 60068-2-20.
IEC 60068-2-27 NOTE Harmonized as EN 60068-2-27.
IEC 60068-2-38 NOTE Harmonized as EN 60068-2-38.
IEC 60068-3-1 NOTE Harmonized as EN 60068-3-1.
IEC 60529 NOTE Harmonized as EN 60529.
IEC 60721 NOTE Harmonized in EN 60721 series (not modified).
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SIST EN 60068-1:2014
- 3 - EN 60068-1:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the

relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 60068-2 series Environmental testing EN 60068-2 series
Part 2: Tests
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SIST EN 60068-1:2014
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SIST EN 60068-1:2014
IEC 60068-1
Edition 7.0 2013-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 1: General and guidance
Essais d’environnement –
Partie 1: Généralités et lignes directrices
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 19.040 ISBN 978-2-8322-1110-6

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

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

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 60068-1:2014
– 2 – 60068-1 © IEC:2013
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

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

2 Normative references ....................................................................................................... 8

3 Terms and definitions ....................................................................................................... 8

4 Standard atmospheric conditions .................................................................................... 11

4.1 Standard reference atmosphere ............................................................................ 11

4.2 Standard atmospheres for referee measurements and tests .................................. 12

4.3 Standard atmospheric conditions for measurements and tests ............................... 12

4.4 Recovery conditions .............................................................................................. 13

4.4.1 General ..................................................................................................... 13

4.4.2 Controlled recovery conditions ................................................................... 13

4.4.3 Recovery procedure .................................................................................. 14

4.5 Standard conditions for assisted drying ................................................................. 14

5 Use of test methods ........................................................................................................ 14

6 Climatic sequence .......................................................................................................... 14

7 Component climatic category .......................................................................................... 15

8 Application of tests ......................................................................................................... 15

9 Significance of the numerical value of a quantity ............................................................ 15

9.1 General ................................................................................................................. 15

9.2 Quantity expressed as nominal value with tolerance .............................................. 15

9.3 Quantity expressed as a range of values ............................................................... 16

Annex A (normative) Component climatic category .............................................................. 18

Annex B (informative) General guidance .............................................................................. 19

Annex C (informative) Environmental test tailoring ............................................................... 25

Bibliography .......................................................................................................................... 31

Figure C.1 – Environmental test tailoring process ................................................................. 26

Table 1 – Standard atmospheres for referee measurements and tests .................................. 12

Table 2 – Standard atmospheres for measurements and tests .............................................. 13

Table 3 – Standard conditions for assisted drying ................................................................. 14

Table B.1 – Choice of tests as a function of objectives and applications ............................... 21

Table B.2 – General sequence of tests ................................................................................. 23

Table B.3 – Principal effects of single environmental parameters .......................................... 24

Table C.1 – Test tailoring process with information flow and the corresponding

activities ............................................................................................................................... 27

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SIST EN 60068-1:2014
60068-1 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 1: General and guidance
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 60068-1 has been prepared by IEC technical committee 104:

Environmental conditions, classification and methods of test.

This seventh edition cancels and replaces the sixth edition, published in 1988, and constitutes

a technical revision.
The main changes with respect to the previous edition are listed below:
– updated normative reference list;
– indication of normative and informative annexes;
– new informative Annex C, Environmental test tailoring.
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SIST EN 60068-1:2014
– 4 – 60068-1 © IEC:2013
The text of this standard is based on the following documents:
FDIS Report on voting
104/618/FDIS 104/627/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

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

A list of all the parts in the IEC 60068 series, published under the general title Environmental

testing, can be found on the IEC website.

This standard should be used in conjunction with the relevant specification which will define

the tests to be used, the required degree of severity for each of them, their order (if relevant),

and the permissible performance limits.

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

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN 60068-1:2014
60068-1 © IEC:2013 – 5 –
INTRODUCTION

The IEC 60068 series contains fundamental information on environmental testing procedures

and severities of tests. In addition, this Part 1 contains information on atmospheric conditions

for measurement and testing.

It is intended to be used in those cases where a relevant specification for a certain type of

product (electrical, electromechanical or electronic equipment and devices, their

subassemblies and constituent parts and components), hereinafter referred to as the

“specimen”, is to be prepared, so as to achieve uniformity and reproducibility in the

environmental testing of this product.

NOTE 1 Although primarily intended for electrotechnical products, many of the environmental testing procedures

in Part 2 of this series are equally applicable to other industrial products.

The expression “environmental conditioning” or “environmental testing” covers the natural and

artificial environments to which specimens may be subjected and exposed to in practice so

that an assessment can be made of their performance under conditions of storage,
transportation, installation and use.

The requirements for the performance of specimens subjected to environmental conditioning

are not covered by this standard. The relevant specification for the specimen under test

defines the allowed performance limits during and after environmental testing.

When drafting a relevant specification or purchasing contract, only those tests should be

specified that are necessary for the relevant specimen, taking into account the technical and

economic aspects.
The IEC 60068 series consists of:

a) this first part, IEC 60068-1 – General and guidance, which deals with generalities;

b) the second part, IEC 60068-2 – Tests – which publishes particular tests separately for

different applications;

c) the third part, IEC 60068-3 – Supporting documentation and guidance, which deals with

background information on a family of tests.

The families of tests comprising Part 2 of the IEC 60068 series are designated by the

following upper-case letters:
A: Cold
B: Dry heat
C: Damp heat (steady-state)
D: Damp heat (cyclic)
E: Impact (for example shock and rough handling shocks)
F: Vibration
G: Acceleration (steady state)
H: (Awaiting allocation)
NOTE 2 Originally allotted to storage tests.
J: Mould growth
K: Corrosive atmospheres (for example salt mist)
L: Dust and sand
M: Air pressure (high or low)
N: Change of temperature
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SIST EN 60068-1:2014
– 6 – 60068-1 © IEC:2013
P: (Awaiting allocation)
NOTE 3 Originally allotted to “flammability”.

Q: Sealing (including panel sealing, container sealing and protection against ingress and

leakage of fluid)
R: Water (for example rain, dripping water)
S: Radiation (for example solar, but excluding electromagnetic)
T: Soldering (including resistance to heat from soldering)
U: Robustness of terminations (of components)
V: (Awaiting allocation)

NOTE 4 Originally allocated to “acoustic noise” but “vibration, acoustically induced” will now be Test Fg,

one of the “vibration” family of tests.
W: (Awaiting allocation)
Y: (Awaiting allocation)

The letter X is used as a prefix together with a second lower-case letter providing for

extension of the list of families of tests, e.g. Test Xa: Immersion in cleaning solvents. The

letter Z is used to denote combined tests and composite tests as follows: Z is followed by a

solidus (slash) and a group of lower-case letters relating to the combined or composite

stresses, for example Test Z/am: Combined cold and low air pressure tests.

If appropriate, a test may be designated as “primarily intended for components” or “primarily

intended for equipment”.

To provide for future expansion within a family of tests and to maintain consistency of

presentation, each family of tests may be subdivided. The subdivisions are identified by the

addition of a (lower-case) second letter, for example:
U: Robustness of terminations and integral mounting devices
Test Ua: Subdivided as Test Ua : Tensile; and Test Ua : Thrust
1 2
Test Ub: Bending
Test Uc: Torsion
Test Ud: Torque

This subdivision is made even though only one test is published and no further tests are

immediately contemplated in the relevant family.

In order to avoid confusion with numbers, the letters i, I, o and O are not used.

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SIST EN 60068-1:2014
60068-1 © IEC:2013 – 7 –
ENVIRONMENTAL TESTING –
Part 1: General and guidance
1 Scope

The IEC 60068 series includes a series of methods for environmental testing along with their

appropriate severities, and prescribes various atmospheric conditions for measurements and

tests designed to assess the ability of specimens to perform under expected conditions of

transportation, storage and all aspects of operational use.

Although primarily intended for electrotechnical products, this standard is not restricted to

them and may be used in other fields where desired.

Other methods of environmental testing, specific to the individual types of specimen, may be

included in the relevant specifications.

The framework of environmental test tailoring process is given in order to assist the

production of test specifications with appropriate tests and test severities.

The IEC 60068 series provides a series of uniform and reproducible environmental, climatic,

dynamic and combined tests, performed and measured under standard atmospheric

conditions, for those preparing specifications and those engaged in the testing of products.

These test methods are based upon available international engineering experience and

judgement and are primarily designed to provide information on the following properties of

specimens:

a) the ability to operate within specified limits of temperature, pressure, humidity, mechanical

stress or other environmental conditions and combinations of these conditions;

b) the ability to withstand conditions of transportation, storage and installation.

NOTE 1 The IEC 60721 series provides a system for classification of environmental conditions and gives relevant

definitions.

The tests in this standard permit the comparison of the performance of sample products. To

assess the quality or useful life of a given production lot, the test methods should be applied

in accordance with a suitable sampling plan and may be supplemented by appropriate

additional tests, if necessary.

NOTE 2 ISO defines “quality” as the degree to which a set of inherent characteristics fulfils requirements..

NOTE 3 "Useful life": under given conditions, the time interval beginning, at a given instant of time, and ending

when the failure intensity becomes unacceptable or when the item is considered unrepairable as a result of a fault.

To provide tests appropriate to the different intensities of an environmental condition, some of

the test procedures have a number of degrees of severity. These different degrees of severity

are obtained by varying the time, temperature, air pressure or some other determining factor,

separately or in combination.

As the tests and their degrees of severity should be based on real environmental conditions

that a particular specimen might encounter, the framework and the necessary phases for the

environmental test tailoring process are provided. The test tailoring process may be used to

produce the required relevant test specification for the particular specimen.
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SIST EN 60068-1:2014
– 8 – 60068-1 © IEC:2013
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-2 (all parts), Environmental testing – Tests
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

NOTE Tests covered by this standard may, in themselves, consist of a series of operations in order to determine

the effect of such a test, or series of tests, on a specimen.
3.1
test

complete series of operations implied by its title, normally comprising the following operations,

if required:
a) pre-conditioning;
b) initial examination and measurements;
c) testing;
d) recovery;
e) final examination and measurements.

Note 1 to entry: Intermediate measurements may be required during conditioning and/or recovery.

Note 2 to entry: When the temperature and humidity for conditioning of a specimen for measurement are the

same as those prescribed for pre-conditioning, the pre-conditioning and conditioning may be merged, and the pre-

conditioning may be said to take the place of conditioning for measurement.
3.2
pre-conditioning

treatment of a specimen with the object of removing, or partly counteracting, the effects of its

previous history

Note 1 to entry: Where pre-conditioning is called for, it is the first process in the test procedure.

Note 2 to entry: Pre-conditioning may be affected by subjecting the specimen to climatic, electrical, or any other

conditions required by the relevant specification in order that the properties of the specimen may be stabilized

before measurement and test.
3.3
testing

exposure of a specimen to environmental conditions in order to determine the effect of such

conditions on the specimen
3.4
recovery

treatment of a specimen, after conditioning, in order that the properties of the specimen may

be stabilized before measurement
3.5
specimen

product designated to be tested in accordance with the procedures of the IEC 60068 series

Note 1 to entry: The term “specimen” includes any auxiliary parts or systems that are integral functional features

of the specimen, for example systems for cooling and heating.
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SIST EN 60068-1:2014
60068-1 © IEC:2013 – 9 –
3.6
heat-dissipating specimen

specimen with the hottest point on its surface, measured in free air conditions and under the

air pressure as specified in 4.3, more than 5 K above the ambient temperature of the

surrounding atmosphere after thermal stability has been reached

Note 1 to entry: Measurements required to prove that a specimen can be classified as either heat-dissipating or

non-heat-dissipating can be made under standard atmospheric conditions for measurement and tests if care has

been taken that no outside influence (for example draughts or sunlight) affects the measurements. In the case of

large or complicated specimens, it may be necessary to make measurements at several points.

3.7
air conditions

conditions within an infinite space where the movement of the air is affected only by the heat-

dissipating specimen itself
3.8
relevant specification

set of requirements to be satisfied by a specimen, indicating the method(s) necessary to

determine whether the requirements given are satisfied
3.9
ambient temperature
temperature of the air (further defined in 3.9.1 and 3.9.2)

Note 1 to entry: In applying these definitions, guidance should be sought from IEC 60068-3-1.

3.9.1
non-heat-dissipating specimens
temperature of the air surrounding the specimen
3.9.2
heat-dissipating specimens

temperature of the air in free air conditions at such a distance from the specimen that the

effect of the dissipation is negligible

Note 1 to entry: In practice, the ambient temperature is taken as the average of temperatures measured at a

number of points in a horizontal plane situated between 0 mm and 50 mm below the specimen, at half the distance

between the specimen and the wall of the chamber, or at 1 m distance from the specimen, whichever is less.

Suitable precautions should be taken to avoid heat radiation affecting these measurements.

3.10
surface temperature
case temperature

temperature measured at one or more specified points on the surface of the specimen

3.11
thermal stability

state when the temperatures of all parts of the specimen are within 3 K, or as otherwise

prescribed by the relevant specification, of their final temperature

Note 1 to entry: For non-heat-dissipating specimens, the final temperature will be the mean (in time) temperature

of the chamber in which the specimen is placed. For heat-dissipating specimens, it is necessary to make repeated

measurements to determine the interval of time for the temperature to change 3 K, or as otherwise prescribed by

the relevant specification. Thermal stability has been reached when the ratio between two consecutive time

intervals exceeds 1,7.

Note 2 to entry: Where the thermal time constant of the specimen is short compared with the duration of the

exposure to a given temperature, no measurement is needed. Where the thermal time constant of the specimen is

of the same order as the duration of the exposure, checks should be made to ascertain that

a) non-heat-dissipating specimens are within the required limit of the mean (in time) ambient temperature,

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SIST EN 60068-1:2014
– 10 – 60068-1 © IEC:2013

b) for heat-dissipating specimens the ratio between two consecutive time intervals exceeds 1,7 when repeated

measurements are made to determine the interval of time required for the temperature to change by 3 K, or as

otherwise prescribed by the relevant specification.

IEC 60068-3-1 gives background information on the testing of specimens with and without heat-dissipation.

Note 3 to entry: In practice, it may not be possible to make direct measurements of the internal temperature of the

specimen. A check may then be made by measuring some other parameter which is temperature-dependent and for

which the temperature dependence is known.
3.12
chamber

enclosure or space in some part of which the specified conditions can be achieved

3.13
working space

part of the chamber in which the specified conditions can be maintained within the specified

tolerances
3.14
combined test
tests du
...

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