SIST EN 60068-2-5:2011

Environmental testing - Part 2-5: Tests - Test Sa: Simulated solar radiation at ground level and guidance for solar radiation testing (IEC 60068-2-5:2010 + corrigendum Dec. 2010)

This standard provides guidance for testing equipment or components under solar radiation conditions. The purpose of testing is to investigate to what extent the equipment or components are affected by solar radiation. This second edition cancels and replaces the first edition of IEC 60068-2-5, published in 1975, and IEC 60068-2-9, published in 1975, and constitute a technical revision. The main changes with respect to the previous edition are listed below: This second edition of IEC 60068-2-5 will make the reading much easier, partly because it includes guidance for solar radiation testing, previously published in a separate publication, IEC 60068-2-9, and partly because it now allows the use of all lamps specified in CIE 85 and published in 1985 by the International commission on Illumination.

Umgebungseinflüsse - Teil 2-5: Prüfverfahren - Prüfung Sa: Nachgebildete Sonnenbestrahlung in Bodennähe und Leitfaden zur Sonnenstrahlung (IEC 60068-2-5:2010 + corrigendum Dec. 2010)

Essais d'environnement - Partie 2-5: Essais - Essai Sa: Rayonnement solaire simulé au niveau du sol et guide pour les essais de rayonnement solaire (CEI 60068-2-5:2010 + corrigendum Dec. 2010)

La CEI 60068-2-5:2010 donne des lignes directrices pour l'essai d'équipements ou de composants soumis à des conditions de rayonnement solaire. L'objectif de cet essai est d'étudier dans quelles proportions les équipements ou les composants sont affectés par le rayonnement solaire. Cette deuxième édition annule et remplace la première édition, publiée en 1975. Elle constitue une révision technique. Les modifications principales par rapport à l'édition précédente sont les suivantes: Cette deuxième édition de la CEI 60068-2-5 est beaucoup plus facile à lire en partie grâce à l'intégration des lignes directrices pour l'essai de rayonnement solaire, auparavant publiées dans une norme séparée, CEI 60068-2-9, et en partie par la possibilité d'utiliser désormais toutes les lampes spécifiées dans la CIE 85, publiée en 1985, par la Commission Internationale de l'Eclairage.

Okoljski preskusi - 2-5. del: Preskusi - Preskus Sa: Simulacija prizemnega sončnega obsevanja in navodilo za preskušanje sočnega obsevanja (IEC 60068-2-5:2010 + popravek Dec. 2010)

Ta standard zagotavlja smernice za preskusno opremo ali komponente pod pogoji sončnega sevanja. Namen preskušanja je preučiti, v kakšnem obsegu bo sončno sevanje vplivalo na opremo ali komponente. Druga izdaja razveljavlja in nadomešča prvo izdajo IEC 60068-2-5, objavljeno leta 1975, in IEC 60068-2-9, objavljeno leta 1975, ter določa tehnično revizijo. Glavne spremembe v primerjavi s predhodno izdajo so navedene v nadaljevanju: Ta druga izdaja IEC 60068-2-5 bo zelo olajšala branje, deloma zato, ker vsebuje smernice za preskušanje sončevega sevanja, ki so bile predhodno objavljene v ločeni objavi, IEC 60068-2-9, in deloma zato, ker ne dopušča uporabe vseh svetil, določenih v CIE 85 in kot jih je leta 1985 objavila Mednarodna komisija za osvetlitev.

General Information

• Status: Withdrawn
• Publication Date: 06-Mar-2011
• Withdrawal Date: 15-Aug-2021
• ICS: 19.040 - Environmental testing
• Technical Committee: I09 - Imaginarni 09
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 30-Jul-2021
• Due Date: 22-Aug-2021
• Completion Date: 16-Aug-2021
• Ref Project: EN 60068-2-5:2011 - Environmental testing - Part 2-5: Tests - Test Sa: Simulated solar radiation at ground level and guidance for solar radiation testing

Relations

• Replaces: SIST EN 60068-2-5:2001 - Environmental testing -- Part 2: Tests - Test Sa: Simulated solar radiation at ground level
• Effective Date: 01-Jan-2014
• Replaced By: SIST EN IEC 60068-2-5:2018 - Environmental testing - Part 2-5: Tests - Test S: Simulated solar radiation at ground level and guidance for solar radiation testing and weathering (IEC 60068-2-5:2018)
• Effective Date: 22-May-2018
• Replaced By: SIST EN IEC 60068-2-5:2018 - Environmental testing - Part 2-5: Tests - Test S: Simulated solar radiation at ground level and guidance for solar radiation testing and weathering (IEC 60068-2-5:2018)
• Effective Date: 07-Jun-2022
• Replaces: SIST EN 60068-2-9:2001 - Environmental testing -- Part 2: Tests - Guidance for solar radiation testing
• Effective Date: 28-Jan-2023
• Replaces: SIST EN 60068-2-5:2001 - Environmental testing -- Part 2: Tests - Test Sa: Simulated solar radiation at ground level
• Effective Date: 28-Jan-2023
• Replaces: SIST EN 60068-2-9:2001 - Environmental testing -- Part 2: Tests - Guidance for solar radiation testing
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60068-2-5:2011
01-april-2011
1DGRPHãþD
SIST EN 60068-2-5:2001
SIST EN 60068-2-9:2001
2NROMVNLSUHVNXVLGHO3UHVNXVL3UHVNXV6D6LPXODFLMDSUL]HPQHJD
VRQþQHJDREVHYDQMDLQQDYRGLOR]DSUHVNXãDQMHVRþQHJDREVHYDQMD,(&
SRSUDYHN'HF
Environmental testing - Part 2-5: Tests - Test Sa: Simulated solar radiation at ground
level and guidance for solar radiation testing (IEC 60068-2-5:2010 + corrigendum Dec.
2010)
Umgebungseinflüsse - Teil 2-5: Prüfverfahren - Prüfung Sa: Nachgebildete
Sonnenbestrahlung in Bodennähe und Leitfaden zur Sonnenstrahlung (IEC 60068-2-
5:2010 + corrigendum Dec. 2010)
Essais d'environnement - Partie 2-5: Essais - Essai Sa: Rayonnement solaire simulé au
niveau du sol et guide pour les essais de rayonnement solaire (CEI 60068-2-5:2010 +
corrigendum Dec. 2010)
Ta slovenski standard je istoveten z: EN 60068-2-5:2011
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
SIST EN 60068-2-5:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 60068-2-5:2011

---------------------- Page: 2 ----------------------

SIST EN 60068-2-5:2011

EUROPEAN STANDARD
EN 60068-2-5

NORME EUROPÉENNE
February 2011
EUROPÄISCHE NORM

ICS 19.040 Supersedes EN 60068-2-5:1999, EN 60068-2-9:1999


English version


Environmental testing -
Part 2-5: Tests -
Test Sa: Simulated solar radiation at ground level and guidance for solar
radiation testing
(IEC 60068-2-5:2010 + corrigendum Dec. 2010)


Essais d'environnement -  Umgebungseinflüsse -
Partie 2-5: Essais - Teil 2-5: Prüfverfahren -
Essai Sa: Rayonnement solaire simulé au Prüfung Sa: Nachgebildete
niveau du sol et guide pour les essais de Sonnenbestrahlung in Bodennähe und
rayonnement solaire Leitfaden zur Sonnenstrahlung
(CEI 60068-2-5:2010 + corrigendum Dec. (IEC 60068-2-5:2010 + corrigendum Dec.
2010) 2010)




This European Standard was approved by CENELEC on 2011-01-02. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, 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, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60068-2-5:2011 E

---------------------- Page: 3 ----------------------

SIST EN 60068-2-5:2011
EN 60068-2-5:2011 - 2 -
Foreword
The text of document 104/500/FDIS, future edition 2 of IEC 60068-2-5, prepared by IEC TC 104,
Environmental conditions, classification and methods of test, was submitted to the IEC-CENELEC parallel
vote and was approved by CENELEC as EN 60068-2-5 on 2011-01-02.
This European Standard supersedes EN 60068-2-5:1999 and EN 60068-2-9:1999.
The main changes with respect to EN 60068-2-5:1999 are listed below:
This EN 60068-2-5:2011 will make the reading much easier, partly because it includes guidance for solar
radiation testing, previously published in a separate publication, EN 60068-2-9, and partly because it now
allows the use of all lamps specified in CIE 85 and published in 1985 by the International commission on
Illumination.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2011-10-02
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2014-01-02
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60068-2-5:2010 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
ISO 4892-1 NOTE  Harmonized as EN ISO 4892-1.
ISO 4892-2 NOTE  Harmonized as EN ISO 4892-2.
ISO 4892-3 NOTE  Harmonized as EN ISO 4892-3.
__________

---------------------- Page: 4 ----------------------

SIST EN 60068-2-5:2011
- 3 - EN 60068-2-5:2011
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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.

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 60068-1 - Environmental testing - EN 60068-1 -
Part 1: General and guidance


IEC 60068-2-1 - Environmental testing - EN 60068-2-1 -
Part 2-1: Tests - Test A: Cold


IEC 60068-2-2 - Environmental testing - EN 60068-2-2 -
Part 2-2: Tests - Test B: Dry heat


IEC 60068-2-78 - Environmental testing - EN 60068-2-78 -
Part 2-78: Tests - Test Cab: Damp heat,
steady state


CIE 20 1972 Recommendation for the integrated irradiance - -
and the spectral distribution of simulated solar
radiation for testing purposes


CIE 85 1985 Solar spectral irradiance - -

---------------------- Page: 5 ----------------------

SIST EN 60068-2-5:2011

---------------------- Page: 6 ----------------------

SIST EN 60068-2-5:2011
IEC 60068-2-5
®
Edition 2.0 2010-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Environmental testing –
Part 2-5: Tests – Test Sa: Simulated solar radiation at ground level and guidance
for solar radiation testing

Essais d’environnement –
Partie 2-5: Essais – Essai Sa: Rayonnement solaire simulé au niveau du sol et
guide pour les essais de rayonnement solaire

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
R
CODE PRIX
ICS 19.040 ISBN 978-2-88910-035-4
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 7 ----------------------

SIST EN 60068-2-5:2011
– 2 – 60068-2-5 Ó IEC:2010
CONTENTS
FOREW ORD . 3
INTRODUCTION . 5
1 Scope and object . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General . 7
4.1 Irradiance . 7
4.2 Spectral distribution . 7
5 C o n di t ioning . 8
5.1 Ge n eral . 8
5.2 Temperature . 8
5.3 H umidi t y . 9
5.4 Ozone and other contaminating gases . 9
5.5 Surface contamination . 9
5.6 Mounting of specimen . 9
5.7 Test facility . 9
5.8 Test apparatus . 9
6 Initial measurement . 10
7 Testing . 10
7.1 General . 10
7.2 Procedure A – 24 h cycle, 8 h irradiation and 16 h darkness, repeated as
required . 10
7.3 Procedure B – 24 h cycle, 20 h irradiation and 4 h darkness, repeated as
required . 10
7.4 Procedure C – Continuous irradiation as required . 11
8 Final measurements. 12
9 Information to be given in the relevant specification . 12
10 Information to be given in the test report . 13
Annex A (informative) Interpretation of results . 14
Annex B (informative) Radiation source . 16
Annex C (informative) Instrumentation . 17
Bibliography . 19

Figure 1 – Global solar spectral irradiance at the earth´s surface for relative air mass . 8
Figure 2 – Test procedures A, B and C . 11

Table 1 – Spectral energy distribution . 8
Table C.1 – Calculated spectral distribution values. 18

---------------------- Page: 8 ----------------------

SIST EN 60068-2-5:2011
60068-2-5 Ó IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ENVIRONMENTAL TESTING –

Part 2-5: Tests – Test Sa: Simulated solar radiation at
ground level and guidance for solar radiation testing


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 60068-2-5 has been prepared by IEC technical committee 104:
Environmental conditions, classification and methods of test.
This second edition cancels and replaces the first edition of IEC 60068-2-5, published in
1975, and IEC 60068-2-9, published in 1975, and constitutes a technical revision.
The main changes with respect to the previous edition are listed below:
This second edition of IEC 60068-2-5 will make the reading much easier, partly because it
includes guidance for solar radiation testing, previously published in a separate publication,
IEC 60068-2-9, and partly because it now allows the use of all lamps specified in CIE 85 and
published in 1985 by the International commission on Illumination.

---------------------- Page: 9 ----------------------

SIST EN 60068-2-5:2011
– 4 – 60068-2-5 Ó IEC:2010
The text of this standard is based on the following documents:
FDIS Report on voting
104/500/FDIS 104/515/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, under the general title Environmental testing,
can be found on the IEC website.
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.

The contents of the corrigendum of December 2010 have been included in this copy.

---------------------- Page: 10 ----------------------

SIST EN 60068-2-5:2011
60068-2-5 Ó IEC:2010 – 5 –
INTRODUCTION
This part of IEC 60068 describes methods of simulation designed to examine the effect of
solar radiation on equipment and components at the surface of the earth. The main
characteristics of the environment to be simulated are the spectral energy distribution of the
sun, as observed at the earth's surface, and the intensity of received energy, in combination
with controlled temperature conditions. However, it may be necessary to consider a
combination of solar radiation with other environments, e.g. temperature, humidity, air
velocity, etc.

---------------------- Page: 11 ----------------------

SIST EN 60068-2-5:2011
– 6 – 60068-2-5 Ó IEC:2010
ENVIRONMENTAL TESTING –

Part 2-5: Tests – Test Sa: Simulated solar radiation at
ground level and guidance for solar radiation testing



1 Scope and object
This part of IEC 60068 provides guidance for testing equipment or components under solar
radiation conditions.
The purpose of testing is to investigate to what extent the equipment or components are
affected by solar radiation.
The method of combined tests detects electrical, mechanical or other physical variations.
2 Normative references
The following referenced documents are indispensable for the application 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 60068-1, Environmental testing – Part 1: General and guidance
IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady
state
CIE 20:1972, Recommendation for the integrated irradiance and the spectral distribution of
simulated solar radiation for testing purposes
CIE 85:1985, Solar spectral irradiance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60068-1, as well as
the following, apply.
3.1
air mass
path length that light from a celestial object takes through the earth’s atmosphere relative to
the length where air mass = 1
NOTE The air mass is 1/sin (gamma), where gamma is the elevation angle of the sun.
3.2
black standard temperature
BST
characteristic value of the specimen surface temperature
NOTE Black standard temperature as measured by a black standard thermometer (see ISO 4892-1).

---------------------- Page: 12 ----------------------

SIST EN 60068-2-5:2011
60068-2-5 Ó IEC:2010 – 7 –
3.3
black panel temperature
characteristic value of the specimen surface temperature
NOTE Black panel temperature as measured by a black panel thermometer (see ISO 4892-1).
3.4
solar constant
rate at which solar energy, at all wavelengths, is received per unit area at the top level of
earth’s atmosphere
2
NOTE The value of the solar constant is E = 1 367 W/m .
0
3.5
optical depth
measure of how much light is absorbed in travelling through a medium
NOTE A completely transparent medium has an optical depth of zero.
4 General remarks
4.1 Overview
The effect of radiation on the specimen will depend on the level of irradiance, the spectral
distribution, the location, the time of day and the sensitivity of the material of the specimen.
4.2 Irradiance
The irradiance by the sun on a plane perpendicular to the incident radiation outside the
earth's atmosphere at the mean earth-sun distance is known as the solar constant E .
0
The irradiance at the surface of the earth is influenced by the solar constant and the
attenuation and scattering of radiation in the atmosphere. For test purposes, CIE 85 gives a
2
value of 1 090 W/m for the global radiation at the surface of the earth from sun at zenith;
2
value based on a solar constant E = 1 367 W/m .
0
4.3 Spectral distribution
The standard spectral distribution of the global radiation specified for this test, in accordance
with the recommendations of the CIE 85, is given in Figure 1 and in Table 1.

---------------------- Page: 13 ----------------------

SIST EN 60068-2-5:2011
– 8 – 60068-2-5 Ó IEC:2010

2 000
1 600

1 200
800
400
0
0,3 0,7 1,1 1,5 1,9 2,3
Wavelength  (mm)

IEC  640/10

NOTE Optical depth of aerosol extinction 0,1 (solid line) and 0,27 (dashes), respectively.
Figure 1 – Global solar spectral irradiance at the earth´s surface
for relative air mass 1
Table 1 – Spectral energy distribution
Spectral Total
*
Ultra-violet B Ultra-violet A Visible Infra-red
region radiation
Bandwidth 320 nm to 400 nm to 800 nm to
300 nm to 300 nm to
400 nm 800 nm 2 450 nm
320 nm 2 450 nm
2 2 2 2 2
Irradiance 4,06 W/m 70,5 W/m 604,2 W/m 411,2 W/m 1 090 W/m
Approximate 0,4 % 6,4 % 55,4 % 37,8 % 100 %
proportion of
total radiation
* Radiation shorter than 300 nm reaching the earth’s surface is insignificant.

If the source of radiation used for the test does not meet the standard spectral distribution
given in Table 1, the exact spectral absorption data of the material and the exact spectral
irradiance of the alternative radiation source in the range from 300 nm to about 3 000 nm and
for the solid angle of 2π sr above the specimen surface shall be known or measured.
5 Conditioning
5.1 General
During the entire test, the irradiation, the temperature within the chamber, the humidity and
any other specified environmental conditions shall be maintained at the levels appropriate to
the particular test procedure specified in the relevant specification. The relevant specification
shall state which preconditioning requirements are to be applied.
5.2 Temperature
The temperature within the chamber during irradiation and darkness periods shall be
controlled in accordance with the procedure (A, B or C) specified. During irradiation, the
–2 –1
Spectral irradiance  (Wm mm )

---------------------- Page: 14 ----------------------

SIST EN 60068-2-5:2011
60068-2-5 Ó IEC:2010 – 9 –
temperature within the chamber shall rise or fall by 1 K/min and be maintained at one of the
preferred values given in IEC 60068-2-1, IEC 60068-2-2 or the relevant specification.
NOTE Additionally, a black standard thermometer or a black panel thermometer can be used to measure the
maximum surface temperature. By ventilation, this temperature can be influenced.
5.3 Humidity
Different humidity conditions, particularly condensation, can markedly affect photochemical
degradation of materials, paints, plastics, etc. If required, the values of IEC 60068-2-78 shall
be preferred.
The relevant specification shall state the humidity and whether it is to be maintained during
a) the irradiation periods only;
b) the periods of darkness only;
c) the whole test duration.
5.4 Ozone and other contaminating gases
Ozone, generated by short wavelength ultra-violet of test sources, will normally be excluded
from the test chamber by the radiation filter(s) used to correct the spectral energy distribution.
As ozone and other contaminating gases can significantly affect the degradation processes of
certain materials, it is important to exclude these gases from the test chamber, unless
otherwise required by the relevant specification.
5.5 Surface contamination
Dust and other surface contamination may significantly change the absorption characteristics
of irradiated surfaces. Unless otherwise required, specimens should be tested in a clean
condition. However, if effects of surface contamination are to be assessed, the relevant
specification should include the necessary information on preparation of surfaces, etc.
5.6 Mounting of specimen
The specimen to be tested shall be placed either on raised support, on a turntable or a
specified substrate of known thermal conductivity and thermal capacity within the chamber as
stated in the relevant specification, and so spaced from other specimens as to avoid shielding
from the source of radiation or re-radiated heat. Temperature sensors should be attached to
specimen as required.
5.7 Test facility
It shall be ensured that the optical parts of the test facility, lamps, reflectors and filters, etc.
are clean.
The level of irradiation over the specified measurement plane shall be measured immediately
prior to each test.
Any ancillary environmental conditions, e.g. ambient temperature, humidity and other
parameters if specified, should be monitored continuously throughout the test.
5.8 Test apparatus
The chamber in which the tests are to be carried out shall be provided with means for
2
obtaining, over the prescribed irradiation measurement plane, an irradiance of 1 090 W/m
2
± 10 % with the spectral distribution given in Table 1. The value of 1 090 W/m shall include
any radiation reflected from the test chamber and received by the specimen under test. It
should not include long-wave infra-red radiation emitted by the test chamber.

---------------------- Page: 15 ----------------------

SIST EN 60068-2-5:2011
– 10 – 60068-2-5 Ó IEC:2010
Means shall also be provided whereby the specified conditions of temperature, air flow and
humidity can be maintained within the chamber.
The temperature within the chamber shall be measured (with adequate shielding from
radiated heat) at a point or points in a horizontal plane 0 mm to 50 mm below the prescribed
irradiation measurement plane, at half the distance between the specimen under test and the
wall of the chamber, or at 1 m from the specimen, whichever is the lesser.
6 Initial measurement
The specimen shall be submitted to the visual, dimensional and functional checks prescribed
by the relevant specification.
7 Testing
7.1 General
During exposure, the temperature within the chamber shall rise or fall by 1 K/min and be
maintained at one of the preferred values given in IEC 60068-2-1 or IEC 60068-2-2 or the
relevant specification.
In procedure A, the temperature within the chamber shall start to rise 2 h before the
irradiation period starts.
During the darkness period in procedures A and B, the temperature within the chamber shall
fall approximately with 1 K/min and be maintained at +25 °C. If the required temperature is
lower than 25 °C, the temperature shall be maintained at the required temperature.
The requirements for irradiation, temperature and time relationships are given in Figure 2.
Throughout the specified test duration, the temperature within the chamber shall be
maintained within ±2 °C of that shown for the appropriate procedure.
2
The level of irradiance should be 1 090 W/m ± 10 % or specified in the relevant specification.
Acceleration of the test by increasing the irradiation above this level is not recommended. The
total daily irradiation approximating the most severe natural conditions is simulated by
procedure A with a duration of exposure to the standard irradiation conditions of 8 h per day.
Thus, exposure for periods in excess of 8 h will effect acceleration over natural conditions.
However, continuous exposure of 24 h per day, procedure C, might mask any degradation
effects of cyclic thermal stressing, and this procedure is therefore not generally recommended
in this instance.
The specimen shall be exposed, for the duration called for in the relevant specification, to one
of the following test procedures (see Figure 2).
7.2 Procedure A – 24 h cycle, 8 h irradiation and 16 h darkness, repeated as required
2
This gives a total irradiation of 8,96 kWh/m per diurnal cycle, which approximates to the most
severe natural conditions. Procedure A should be specified where the principal interest is in
thermal effects.
7.3 Procedure B – 24 h cycle, 20 h irradiation and 4 h darkness, repeated as required
2
This gives a total irradiation of 22,4 kWh/m per diurnal cycle and is applicable where the
principal interest is in degradation effects.

---------------------- Page: 16 ----------------------

SIST EN 60068-2-5:2011
60068-2-5 Ó IEC:2010 – 11 –
7.4 Procedure C – Continuous irradiation as required
A simplified test, applicable where cyclic thermal stressing is unimportant and photochemical
effects only are to be assessed. Also for the assessment of heating effects on specimens with
low thermal capacity.
Procedure A
1 cycle
T
2
T
1
Irradiation
0 8 Time  (h) 24



Procedure B
1 cycle
T
2
T
1
Irradiation
0 Time  (h) 20 24


Procedure C
T
2
T
1
Continuous irradiation
0
Time  (h)


Key
T lower temperature (25 °C if not otherwise specified)
1
T upper temperature (40 °C if not otherwise specified)
2
Figure 2 – Test procedures A, B and C

---------------------- Page: 17 ------
...