Environmental testing - Part 2-53: Tests and guidance - Combined climatic (temperature/humidity) and dynamic (vibration/shock) tests

IEC 60068-2-53:2010 provides a description of test methods and guidance for testing equipment or components under combined climatic and dynamic conditions. The purpose of combined testing is to investigate to what extent the equipment or components are affected by combined climatic and dynamic tests. This second edition cancels and replaces the first edition of IEC 60068-2-50, published in 1983, the first edition of IEC 60068-2-51, published in 1983 and the first edition of 60068-2-53, published in 1984 and constitutes a technical revision. The main changes with respect to the previous editions of all three standards cited above is to update and group tests. In this way it allows for the possibility to use different kinds of vibration excitation:
- sine, random or mixed mode;
- or shocks, with different tests for climatic conditions;
- cold, dry heat, change of temperature or constant and cyclic damp heat.

Essais d'environnement - Partie 2-53: Essais et guide - Essais combinés climatiques (température/humidité) et dynamiques (vibrations/chocs)

La CEI 60068-2-53:2010 fournit une description des méthodes d'essai et des lignes directrices en vue des essais du matériel ou des composants dans des conditions combinées climatiques et dynamiques. L'objet des essais combinés est d'étudier dans quelle mesure le matériel ou les composants sont affectés par des essais combinés climatiques et dynamiques. Cette deuxième édition annule et remplace la première édition de la CEI 60068-2-50, publiée en 1983, la première édition de la CEI 60068-2-51, publiée en 1983, et la première édition de la CEI 60068-2-53, publiée en 1984. Elle constitue une révision technique. Les principales modifications par rapport aux éditions précédentes des trois normes citées ci-dessus sont la mise à jour et le regroupement des essais. Ainsi, il est possible d'utiliser différentes sortes de vibrations:
- sinusoïdales, aléatoires ou en mode mixte;
- ou chocs, lors des différents essais sous conditions climatiques;
- froid, chaleur sèche, variations de température ou chaleur humide constante ou cyclique.

General Information

Status
Published
Publication Date
20-Apr-2010
Current Stage
PPUB - Publication issued
Start Date
21-Apr-2010
Completion Date
21-Apr-2010
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IEC 60068-2-53
Edition 2.0 2010-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-53: Tests and guidance – Combined climatic (temperature/humidity)
and dynamic (vibration/shock) tests
Essais d’environnement –
Partie 2-53: Essais et guide – Essais combinés climatiques
(température/humidité) et dynamiques (vibrations/chocs)
IEC 60068-2-53:2010
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60068-2-53
Edition 2.0 2010-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-53: Tests and guidance – Combined climatic (temperature/humidity)
and dynamic (vibration/shock) tests
Essais d’environnement –
Partie 2-53: Essais et guide – Essais combinés climatiques
(température/humidité) et dynamiques (vibrations/chocs)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 19.040 ISBN 978-2-88910-039-2
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 60068-2-53 © IEC:2010
CONTENTS

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

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

1 Scope...............................................................................................................................6

2 Normative references .......................................................................................................6

3 Testing .............................................................................................................................6

3.1 General ...................................................................................................................6

3.2 Temperature information .........................................................................................7

3.3 Dynamic test information .........................................................................................8

3.4 Initial measurement and functional performance test ...............................................8

3.5 Operating condition of specimen .............................................................................8

3.6 Mechanical conditioning of specimen ......................................................................8

4 Final measurements .........................................................................................................8

5 Information to be given in the relevant specification .........................................................8

6 Information to be given in the test report ..........................................................................9

Annex A (informative) Examples of test sequences...............................................................11

Annex B (informative) Guidance on combined climatic and dynamic testing .........................15

Bibliography..........................................................................................................................17

Figure A.1 – Example of test sequence with cold or dry heat testing .....................................11

Figure A.2 – Example of test sequence with slow temperature ..............................................12

Figure A.3 – Example of test sequence with damp heat, cyclic..............................................13

Figure A.4 – Example of test sequence with damp heat, constant .........................................14

Figure B.1 – Example for a typically test set-up ....................................................................16

Table 1 – Allowable combinations of IEC standards ................................................................7

---------------------- Page: 4 ----------------------
60068-2-53 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-53: Tests and guidance – Combined climatic
(temperature/humidity) and dynamic (vibration/shock) tests
FOREWORD

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

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

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

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

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

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

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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 60068-2-53 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 60068-2-50, published in 1983,
– the first edition of IEC 60068-2-51, published in 1983 and
– the first edition of 60068-2-53, published in 1984
and constitutes a technical revision.

The main changes with respect to the previous editions of all three standards cited above is to

update and group tests. In this way it allows for the possibility to use different kinds of

vibration excitation – sine, random or mixed mode – or shocks, with different tests for climatic

conditions – cold, dry heat, change of temperature or constant and cyclic damp heat.

---------------------- Page: 5 ----------------------
– 4 – 60068-2-53 © IEC:2010
The text of this standard is based on the following documents:
FDIS Report on voting
104/499/FDIS 104/514/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.
---------------------- Page: 6 ----------------------
60068-2-53 © IEC:2010 – 5 –
INTRODUCTION

Equipment and components are required to function without significant reduction in

performance when subjected to different environmental parameters.

The type and severity of the environmental parameters depend on the operational, transport

and storage environments to which the equipment and components are subjected. The

environmental effects on the performance of equipments in the tropics and subtropics are

totally different from those in arctic regions. Individual parameters cause a variety of different

and overlapping effects on the equipment and components.

The manufacturer attempts to ensure, and the user expects, that equipment and components will

survive the environments to which they will be subjected throughout their useful life. This

expectation can be assessed by exposure of the specimen to a range of simulated environmental

parameters controlled in the laboratory. The severity of the environmental parameters is often

increased to obtain meaningful results in a relatively short period of time. This allows

assessment of the likely effects of applied environmental conditions.

The combination of temperature, humidity and vibration occurs especially in the domains of

automotive, rail and aerospace environments.
---------------------- Page: 7 ----------------------
– 6 – 60068-2-53 © IEC:2010
ENVIRONMENTAL TESTING –
Part 2-53: Tests and guidance – Combined climatic
(temperature/humidity) and dynamic (vibration/shock) tests
1 Scope

This part of IEC 60068 provides a description of test methods and guidance for testing

equipment or components under combined climatic and dynamic conditions.

The purpose of combined testing is to investigate to what extent the equipment or

components are affected by combined climatic and dynamic tests.

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 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)

IEC 60068-2-14, Environmental testing – Part 2-14: Test – Test N: Change of temperature

IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock

IEC 60068-2-30, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic (12 h

+ 12 h cycle)

IEC 60068-2-64, Environmental testing – Part 2-64: Tests – Test Fh: Vibration, broadband

random (digital control) and guidance

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

state

IEC 60068-2-80, Environmental testing – Part 2-80: Tests – Test Fi: Vibration – Mixed mode

3 Testing
3.1 General

All parameters such as temperatures, cold, dry heat, temperature change, type of vibration,

exposure time to temperature, exposure time to vibration, number of shocks, repetition time of

---------------------- Page: 8 ----------------------
60068-2-53 © IEC:2010 – 7 –

shocks, axis of shock or vibration, state of operation and so on, shall be selected from the

relevant IEC 60068-2 standards or relevant specification.

The combinations of environmental conditions should be selected to ensure that electrical and

mechanical performances of the specimen are satisfactory under storage, transportation and

operational conditions. Certain combinations of possible tests shown in Table 1 may not be

practicable.
Examples of these include the following:

– full sweep of sinusoidal vibration spectrum not completed during change of temperature or

temperature cycling;

– temperature stabilization of dynamic non linear systems, e.g. anti vibration mounts during

vibration with change of temperature or temperature cycling;

– full cycle of mixed mode vibration during change of temperature or temperature cycling.

Table 1 – Allowable combinations of IEC standards
Dynamic tests
Climatic tests
Vibration
Vibration Vibration
Shock (broad band
(sinusoidal) (mixed mode)
random)
IEC 60068-2-27 IEC 60068-2-6 IEC 60068-2-64 IEC 60068-2-80
Cold
X X X X
IEC 60068-2-1
Dry heat
X X X X
IEC 60068-2-2
Change of
temperature
X X X X
IEC 60068-2-14
Damp heat, cyclic
X X X X
IEC 60068-2-30
Damp heat, constant
X X X X
IEC 60068-2-78

Specimens may be repositioned for shock or vibration along another axis at standard climatic

conditions according to IEC 60068-1, as required by the relevant specification. The dynamic

test shall be continued when the required test temperature and humidity has been reached.

3.2 Temperature information

If cold or dry heat testing is required, the exposure time shall not commence until all parts of

the specimen have reached a temperature within at least 3 K of the working space

temperature. For heat-dissipating specimens, the period of exposure shall not begin until the

temperature of the specimens changes not more than 1 K within 1 h at the stabilized working

space temperature. The last hour of the temperature-soaking time shall be considered to be

the first hour of the exposure period.

If a damp heat constant testing is required, the exposure time shall not commence until all

parts of the specimen have reached a temperature within at least 3 K of the temperature, and

a relative humidity within 3 % of the humidity, within the working space of the test chamber.

For heat-dissipating specimens, the period of exposure shall not begin until the temperature

of the specimens changes not more than 1 K within 1 h at the stabilized working space

temperature. The last hour of the temperature-soaking time shall be considered to be the first

hour of the exposure period.
---------------------- Page: 9 ----------------------
– 8 – 60068-2-53 © IEC:2010

If slow temperature change test or damp heat cyclic test is performed, the required exposure

time starts with the beginning of temperature change.

If the specimen is mounted on shock absorbers, time shall be given for temperature

stabilization of the absorber elements.
3.3 Dynamic test information

The relevant specification shall contain dynamic test information. The dynamic test

information includes following details (see also Clause 5):

a) identification of dynamic test ( such as sinusoidal, random, mixed mode vibration or

impact);
b) severities of dynamic stress;
c) axis and directions of dynamic stress;
d) duration and timing of dynamic stress (see Annex A);
e) IEC 60068-2-47 shall be referred to concerning mounting of specimen;
f) other details specified in the reference standards.
3.4 Initial measurement and functional performance test

The specimen shall be submitted to the visual, dimensional, functional and any other checks

prescribed by the relevant specification.
3.5 Operating condition of specimen

In the case of electrically-operated specimens, the times at which the power supply shall be

powered on or off and the voltage of the power supply within each temperature cycle shall be

specified in the relevant specification.

The times at which other functions such as cooling, heating and various loads are switched on

or off shall be stipulated in the relevant specification or controlled by a special type of test

equipment.
3.6 Mechanical conditioning of specimen

The mechanical conditioning of the specimen per cycle shall preferably be performed in the

last hour of the hot or cold phase, i.e. prior to the changeover to the following limit

temperature, or shall be performed in any other combination which can be defined in the

relevant specification. If the specimen is operated by power supply, this shall be connected

for the duration of the mechanical conditioning.
4 Final measurements

The specimen shall be submitted to the visual, dimensional and functional checks prescribed

by the relevant specification.

The relevant specification shall provide the criteria upon which the acceptance or rejection of

the specimen is to be based.
5 Information to be given in the relevant specification

The relevant specification shall contain the following details as far as they are applicable:

a) exposure time to temperature;
b) test chamber temperature change rate;
---------------------- Page: 10 ----------------------
60068-2-53 © IEC:2010 – 9 –
c) test temperature;
d) number of temperature cycles;
e) combined test schedule;
f) vibration severity;
g) number of cycles, by damp heat, cyclic;
h) shock severity;
i) axis and directions of shock and/or vibration;
j) state of operation;
k) number of specimens,
l) humidity if relevant for combined test;
m) preconditioning;
n) type and scope of initial measurement;
o) period of operation;
p) type and scope of intermediate measurement;
q) recovery;
r) type and scope of final measurement;
s) criteria for evaluation;
t) type and scope of test report.
6 Information to be given in the test report

When this test included in the relevant specification, the following details shall be given where

applicable:
a) Customer (name and address)
b) Test laboratory (name and address and details of
accreditation – if any)
c) Test dates (dates when test was run)
d) Type of test (kind of vibration or shock, cold or dry
heat, slow temperature change, damp heat,
cyclic or constant)
e) Required values (temperature, humidity, acceleration,
frequency range, etc.)
f) Purpose of test (development, qualification, etc.)
g) Test standard, edition (IEC 60068-2-53, edition used)
h) Relevant laboratory test procedure (code and issue)
i) Test specimen description (drawing, photo, quantity build status, etc.)
j) Test chamber and vibration system (manufacturer, model number, unique id,
identity etc.)
k) Performance of test apparatus (set point temperature control, set point
acceleration control air flow, etc.)
l) Air velocity and direction (air velocity and direction of incident air to
the specimen)

m) Uncertainties of measurement system (uncertainties data, including temperature

stability of transducer sensitivities)
n) Calibration data (last and next due date)

o) Initial, intermediate and final (initial, intermediate and final measurements)

measurements
p) Required severities (from relevant specification)
---------------------- Page: 11 ----------------------
– 10 – 60068-2-53 © IEC:2010
q) Test severities (measuring points, data, etc.)
r) Performance of test specimens (results of functional tests etc.)
s) Observations during testing and actions (any pertinent observations)
taken
t) Summary of test (test summary)
u) Distribution (distribution list)
---------------------- Page: 12 ----------------------
60068-2-53 © IEC:2010 – 11 –
Annex A
(informative)
Examples of test sequences

Figures A.1 to A.4 represent examples of a test sequence combination of climatic conditions

(temperature and/or humidity), dynamic conditions (vibration or shock) and electric loads

conditions.
Temperature
Temperature
Vibration or shock
Vibration or shock
Off
off
Load
Load
Off
off
t t t t t t t t t t t t t t
t t t t t t t t t t t t t
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
IEC 635/10
Key
T required temperature
t temperature non stabilized
t to t temperature stabilized
2 13
t -t ; t -t ; t any kind of vibration or shock
2 6 8 10 12
t ; t ; t ; t ; t with electrical load and/or functional check
3 5 7 9 11
Figure A.1 – Example of test sequence with cold or dry heat testing
---------------------- Page: 13 ----------------------
– 12 – 60068-2-53 © IEC:2010
Temperature
Temperature
Vibration or shock
Off
off
Load
Load
Off
off
tt t t tt tt tt tt tt tt tt tt tt tt tt
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 4 5 8 9 10 11 12 13
3 6 7
IEC 636/10
Key
T required lower temperature
T required upper temperature
t temperature non stabilized
t temperature change from T to T
2 1 2
t and t upper temperature constant
3 4
t temperature change from T to T
5 2 1
lower temperature constant
t and t
6 7
t temperature change from T to T
8 1 2
t and t upper temperature constant
9 10
t temperature change from T to
11 2
t and t lower temperature constant
12 13
t to t ; t to t ; t any kind of vibration or shock
2 6 8 10 12
t ; t ; t ; t ; t with electrical load and/or functional check
3 5 7 9 11
Figure A.2 – Example of test sequence with slow temperature
---------------------- Page: 14 ----------------------
60068-2-53 © IEC:2010 – 13 –
Humidity
Humidity
rh.
rh.
t t
Temperature
Temperature
V ibration or shock
Vibration or shock
Off
off
Load
Load
ofOfff
t t t t t t t t t t t t t
t t 3t t t t t t t t t t t t
11 22 3 44 55 66 77 88 99 1010 1111 12 1313
IEC 637/10
Key
rh required relative humidity
T required lower temperature
T required upper temperature
t temperature and humidity non stabilized
t and t temperature change from T to T
2 3 1 2
t to t upper temperature constant
4 7
t and t temperature change from T to T
8 9 2 1
t to t lower temperature constant
10 13
t and t ; t to t ; t any kind of vibration or shock
3 4 7 9 11
t ; t ; t ; t ; t with electrical load and/or functional check
3 5 7 9 11

NOTE Humidity will not stay constant while temperature is changing. It should be restabilized within 3 % before

going to the next step
Figure A.3 – Example of test sequence with damp heat, cyclic
---------------------- Page: 15 ----------------------
– 14 – 60068-2-53 © IEC:2010
Humidity
Humidity
rh.
Temperature
Temperature
Vibration or shock
Vibration or shock
Off
off
Load
Load
Off
off
t t t t t t t t t t t t t t
t t t t t t t t t t t t t
11 22 33 44 55 66 7 88 99 1010 11 1212 1313
7 11
IEC 638/10
Key
rh required relative humidity
T required temperature
t temperature and humidity non stabilized
t to t ; t to t ; t to t any kind of vibration or shock
2 3 7 8 11 12
t ; t ; t ; t ; t with electrical load and/or functional check
3 5 7 9 11
Figure A.4 – Example of test sequence with damp heat, constant
---------------------- Page: 16 ----------------------
60068-2-53 © IEC:2010 – 15 –
Annex B
(informative)
Guidance on combined climatic and dynamic testing
B.1 General

This annex furnishes fundamental comments for applying combined tests of temperature

and/or humidity with vibration or shock, based on different parts within the IEC 60068 series.

For the purposes of combined testing, IEC 60068-1, Environmental testing – Part 1: General

and guidance, shall be used together with the relevant preferred values described in

IEC 60068-2.
B.2 Consideration of test procedure

For combined testing, it may be necessary to test with high air circulation for the following

reasons:
a) dissipation of heat from the shaker;

b) air circulation about the specimen may be reduced by the presence of the shaker.

B.3 Environmental conditions

In the following, the effects of low and high temperature and vibration on materials are

described.

a) Both low and high temperature can change the qualities of materials. In addition, the risk

of damage is increased by vibration. Equipment with many different materials or with ropy,

elastic materials, can be very sensitive during a combined test of temperature, humidity

and vibration.

b) Under extreme temperatures the characteristic frequency may be shifted so that the

introduced vibration will be enhanced. At low temperature the effect is significant for a

vibration absorber consisting of rubber elastic materials.
B.4 Testing equipment
The combined tests with temperature, humidity and vibration
...

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