Environmental testing - Part 3-5: Supporting documentation and guidance - Confirmation of the performance of temperature chambers

IEC 60068-3-5:2018 is now available as IEC 60068-3-5:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60068-3-5:2018 provides a uniform and reproducible method of confirming that temperature test chambers, without specimens, conform to the requirements specified in climatic test procedures of IEC 60068-2 (all parts) and other standards. This document is intended for users when conducting regular chamber performance monitoring. This second edition cancels and replaces the first edition published in 2001. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Confirmation procedures are clarified.
This bilingual version (2019-05) corresponds to the monolingual English version, published in 2018-01.
The French version of this standard has not been voted upon.

Essais d'environnement - Partie 3-5: Documentation d’accompagnement et guide - Confirmation des performances des chambres d’essai en température

L’IEC 60068-3-5:2018 fournit une méthode uniforme et reproductible pour confirmer que les chambres d’essai en température, sans spécimens, sont conformes aux exigences spécifiées dans les méthodes d’essai climatique de l’IEC 60068-2 (toutes les parties) et d’autres normes. Ce document est destiné à aider les utilisateurs lorsqu’ils réalisent des contrôles réguliers des performances de leur chambre d’essai.
Cette deuxième édition annule et remplace la première édition, parue en 2001. Elle constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
- Les procédures de confirmation sont clarifiées.
La présente version bilingue (2019-05) correspond à la version anglaise monolingue publiée en 2018-01.
La version française de cette norme n'a pas été soumise au vote.

[Not translated]

General Information

Status
Published
Publication Date
22-Jan-2018
Current Stage
PPUB - Publication issued
Completion Date
23-Jan-2018

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IEC 60068-3-5
Edition 2.0 2018-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 3-5: Supporting documentation and guidance – Confirmation of the
performance of temperature chambers
Essais d’environnement –
Partie 3-5: Documentation d’accompagnement et guide – Confirmation des
performances des chambres d’essai en température
IEC 60068-3-5:2018-01(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60068-3-5
Edition 2.0 2018-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 3-5: Supporting documentation and guidance – Confirmation of the
performance of temperature chambers
Essais d’environnement –
Partie 3-5: Documentation d’accompagnement et guide – Confirmation des
performances des chambres d’essai en température
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-6968-8

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: 3 ----------------------
– 2 – IEC 60068-3-5:2018 © IEC 2018
CONTENTS

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

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

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

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

3 Terms and definitions ...................................................................................................... 6

4 Measuring chamber performances ................................................................................... 8

4.1 Test area environment ............................................................................................ 8

4.2 Temperature measurement system ......................................................................... 8

4.3 Temperature chamber test specimens ..................................................................... 8

4.4 Specified location of temperature sensors in working space .................................... 9

4.5 Measurement method ........................................................................................... 10

4.5.1 General ......................................................................................................... 10

4.5.2 Achieved temperature .................................................................................... 10

4.5.3 Temperature stabilization .............................................................................. 10

4.5.4 Temperature fluctuation ................................................................................. 11

4.5.5 Temperature gradient .................................................................................... 12

4.5.6 Temperature variation in space ...................................................................... 12

4.5.7 Temperature rate of change ........................................................................... 13

4.6 Standard temperature sequence ........................................................................... 14

5 Information to be given in the performance test report ................................................... 14

Bibliography .......................................................................................................................... 16

Figure 1 – Working space ....................................................................................................... 7

Figure 2 – Example of temperature differences ....................................................................... 8

Figure 3 – Location sensors for temperature chambers up to 2 000 l ...................................... 9

Figure 4 – Location of minimal additional sensors for temperature chambers

over 2 000 l ............................................................................................................................. 9

Figure 5 – Example of achieved temperature ........................................................................ 10

Figure 6 – Example of temperature stabilization for chambers up to 2 000 l .......................... 11

Figure 7 – Example of temperature fluctuation ...................................................................... 11

Figure 8 – Example of temperature gradient for chambers up to 2 000 l ................................ 12

Figure 9 – Example of temperature gradient for chambers <2 000 L ...................................... 13

Figure 10 – Example of temperature rate of change .............................................................. 14

Table 1 – Practical dimensions ............................................................................................... 7

---------------------- Page: 4 ----------------------
IEC 60068-3-5:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 3-5: Supporting documentation and guidance –
Confirmation of the performance of temperature chambers
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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with the International Organization for Standardization (ISO) in accordance with conditions determined by

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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.

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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60068-3-5 has been prepared by IEC technical committee 104:

Environmental conditions, classification and methods of test.

This bilingual version (2019-05) corresponds to the monolingual English version, published in

2018-01.

This second edition cancels and replaces the first edition published in 2001. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) Confirmation procedures are clarified.
---------------------- Page: 5 ----------------------
– 4 – IEC 60068-3-5:2018 © IEC 2018
The text of this International Standard is based on the following documents:
FDIS Report on voting
104/759/FDIS 104/778/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.
The French version of this standard has not been voted upon.

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

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

testing, can be found on the IEC website.

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

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 60068-3-5:2018 © IEC 2018 – 5 –
INTRODUCTION

IEC 60068 (all parts) contains fundamental information on environmental testing procedures

and severities.

The expression "environmental conditioning" or "environmental testing" covers the natural and

artificial environments to which components or equipment may be exposed so that an

assessment can be made of their performance under conditions of use, transport and storage

to which they may be exposed in practice.

Temperature chambers used for "environmental conditioning" or "environmental testing" are

not described in any publication, although the method of maintaining and measuring

temperature and/or humidity has a great influence on test results. The physical characteristics

of temperature chambers can also influence test results.
---------------------- Page: 7 ----------------------
– 6 – IEC 60068-3-5:2018 © IEC 2018
ENVIRONMENTAL TESTING –
Part 3-5: Supporting documentation and guidance –
Confirmation of the performance of temperature chambers
1 Scope

This part of IEC 60068 provides a uniform and reproducible method of confirming that

temperature test chambers, without specimens, conform to the requirements specified in

climatic test procedures of IEC 60068-2 (all parts) and other standards. This document is

intended for users when conducting regular chamber performance monitoring.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.
IEC 60068-2 (all parts), Environmental testing – Part 2: Tests

IEC 60068-3-7, Environmental testing – Part 3-7: Supporting documentation and guidance –

Measurements in temperature chambers for tests A and B (with load)

IEC 60068-3-11, Environmental testing – Part 3-11: Supporting documentation and guidance

– Calculation of uncertainty of conditions in climatic test chambers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
temperature test chamber

enclosure or space in some parts of which the temperature conditions, specified in

IEC 60068-2 (all parts), can be achieved
3.2
temperature setpoint
desired temperature as set by the chamber controls
3.3
achieved temperature

stabilized temperature which desired temperature at the centre of the working space achieves

within specified tolerance
---------------------- Page: 8 ----------------------
IEC 60068-3-5:2018 © IEC 2018 – 7 –
3.4
temperature stabilization

state of maintaining temperature within specified tolerance during specified time at specified

points in the working space
3.5
temperature fluctuation

difference, after stabilization, between the maximum and minimum temperatures at specified

point in the working space during a specified interval of time
Note 1 to entry: For calibration, the centre point of working space may be used.
3.6
working space

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

tolerances
Note 1 to entry: See Figure 1 and Table 1.
X X
1 2
L L
1 2
IEC
Figure 1 – Working space
Table 1 – Practical dimensions
Size Volume Distance X X (min.)
mm mm
Small Up to 1 000 L/10 50
Medium 1 000 to 2 000 L/10 100
Large More than 2 000 L/10 150
NOTE Not all chambers are cubic in construction.
3.7
temperature gradient

maximum difference in mean value, after stabilization, at any moment in time between two

separate points in the working space
3.8
temperature variation in space

difference in mean value, after stabilization, at any moment in time between the temperature

at the centre of the working space and at any other point in the working space
---------------------- Page: 9 ----------------------
– 8 – IEC 60068-3-5:2018 © IEC 2018
3.9
temperature rate of change

rate, in kelvin per minute, for the transition between two specified temperatures measured at

the centre of the working space
Note 1 to entry: See Figure 2.
Temperature fluctuation
outside the centre of
working space (see 3.5)
Temperature fluctuation
in the centre of
working space (see 3.6)
Temperature fluctuation
outside the centre of
working space (see 3.5)
Time
IEC
Figure 2 – Example of temperature differences
4 Measuring chamber performances
4.1 Test area environment

The environment around a temperature test chamber may influence the conditions inside the

test chamber.

The confirmation of performance of temperature chambers should be carried out under

standard atmospheric conditions specified in IEC 60068-1.
4.2 Temperature measurement system
The uncertainty of measurement of the output of the measurement system should be

determined by calibration of the system, traceable to international standards (see ISO 10012).

The temperature sensors may be either calibrated platinum resistors or a thermocouple. The

thermal response time of the sensors shall be within a minimum of 10 s and a maximum of

40 s for 50 % of response. It is preferred that the thermal response time of the entire

measurement system to be less than 40 s. The use of sensors that are compliant to

IEC 60584-1 tolerance class 1 (for thermocouples) or IEC 60751 tolerance class A (for

resistors) is recommended.
4.3 Temperature chamber test specimens
All measurements described in 4.5 are performed with an empty working space. For

measuring with test specimens (with or without heat dissipation), see IEC 60068-3-7.

Temperature
Variation
(see 3.8)
Gradient
(see 3.7)
---------------------- Page: 10 ----------------------
IEC 60068-3-5:2018 © IEC 2018 – 9 –
4.4 Specified location of temperature sensors in working space

Temperature measuring sensors are located in each corner and in the centre of the working

space (see Figure 3, minimum 9 sensors). For temperature chambers over 2 000 l, additional

sensors should be located in front of the centre of each wall (see Figure 4, minimum

15 sensors). The measuring system is to be arranged in such a way that the temperature

distribution of the empty test chamber will not be affected. For a large capacity chamber,

there may be a significant difference between the temperature control sensor(s) and the

temperature at the centre of the working space. It may be necessary to adjust the temperature

setting to achieve the necessary tolerance.
3 N
10 N
Centre
IEC
Figure 3 – Location of sensors for
temperature chambers up to 2 000 l
IEC
Figure 4 – Location of minimal additional sensors for
temperature chambers over 2 000 l
---------------------- Page: 11 ----------------------
– 10 – IEC 60068-3-5:2018 © IEC 2018

For confirmation monitoring, data should be recorded at least once a minute. The device used

for recording data from the chamber monitoring sensors should be independent of the

chamber control system.
4.5 Measurement method
4.5.1 General

The temperature output of the temperature measuring system (see Figure 3 or Figure 4)

determines, after chamber stabilization, the achieved temperature, temperature fluctuation

and temperature gradient of the working space. For tolerance, the specification of the

temperature/humidity chamber or, as necessary, tolerance specified in IEC 60068-2 (all parts),

is required to maintain at the centre of the working space. Location of sensor is minimum 9

points or 15 points. This depends on the test chamber size. The measurement method is

explained based on 9 points.

Uncertainty of measurement of the temperature measuring system shall be according to

IEC 60068-3-11.
4.5.2 Achieved temperature

Temperature is achieved when the centre of the working space maintains the tolerance as

required by IEC 60068-2 (all parts). An example is shown in Figure 5.
Tolerance 5
Temperature
setting
IEC

For tolerance, check the specification of the temperature chamber, or, as necessary, use tolerance specified in

IEC 60068-2 which is required to maintain at the centre of the working space.

T must be minimum 30 min. N is the temperature at the centre of the working space.

Figure 5 – Example of achieved temperature
4.5.3 Temperature stabilization

Temperature reached and maintained within the allowable range in the working space is

shown in Figure 6. Allowable range is based on the temperature fluctuation, temperature

variation in space, and temperature gradient as the temperature chamber specification.

Specified time T is minimum 30 min after the measurement points (e.g. N to N ) are within

2 1 9
the allowable range.
---------------------- Page: 12 ----------------------
IEC 60068-3-5:2018 © IEC 2018 – 11 –
Allowable
range
IEC
Figure 6 – Example of temperature stabilization for chambers up to 2 000 l
4.5.4 Temperature fluctuation

The fluctuation during a specified interval of time at specified temperature points in the

working space, after temperature stabilization, is shown in Figure 7.
Max
+2σ
n–1
+1σ
n–1
–1σ
n–1
Average
temperature N
Ave
n–1
Specimen standard
deviation
–2σ
n–1
Min
0 5 10 15 20 25 30
Time (min)
IEC
Figure 7 – Example of temperature fluctuation

Measurements are actually made at a certain sampling interval. It is not guaranteed that data

captures the fluctuation peak. For that reason, the sample standard deviation, 𝜎𝜎 shall be

𝑛𝑛−1

obtained from the data measured in each measurement point after temperature has stabilized,

and the temperature fluctuation shall be within ±2𝜎𝜎 .
𝑛𝑛−1
---------------------- Page: 13 ----------------------
– 12 – IEC 60068-3-5:2018 © IEC 2018

The temperatures measured in a certain measurement point, after stabilization, over a

30-minute period 10 or more times at even intervals shall be as follows.
N , N , … , N , … N (n≧10)
1 2 i n
The mean of N shall be N .
Ave
The specimen standard deviation, 𝜎𝜎 shall be defined as follows.
𝑛𝑛−1
(𝑋𝑋−𝑁𝑁 )
𝑖𝑖 𝐴𝐴𝐴𝐴𝐴𝐴
𝜎𝜎 =
𝑛𝑛−1
𝑛𝑛−1

Temperature fluctuation ±2𝜎𝜎 shall be obtained in all 9 measurement points, and the highest

𝑛𝑛−1
value within that shall be annotated as the temperature fluctuation.
4.5.5 Temperature gradient

As shown in Figure 8, the maximum difference in mean temperature in all measurement points

of the effective space shall be the temperature gradient.
AveMax
AveMin
0 5 10 15 20 25 30
Time (min)
IEC
N : Mean highest temperature in each of 9 measurement points
AveMax
N : Mean lowest temperature in each of 9 measurement points
AveMin
Temperature gradient = N – N
AveMax AveMin
Figure 8 – Example of temperature gradient for chambers up to 2 000 l
4.5.6 Temperature variation in space

As shown in Figure 9, temperature variation in space is the difference of the mean

temperature at the centre of the working space and the mean temperature of another

Temperature gardient
---------------------- Page: 14 ----------------------
IEC 60068-3-5:2018 © IEC 2018 – 13 –

measurement point. The maximum difference between the centre of the working space and

each measuring point shall be stated.
CornerAve
CenterAve
CornerAve
0 5 15 20 25 30
Time (min)
IEC
N : Mean temperature at chamber center
CenterAve
N j=1 to 8: Mean temperature at corner of working space
CornerAve(j)
Temperature variation in space =|Max(N – N )|
CornerAve[j] CenterAve

The value obtained as the temperature variation in space shall be (N – N ), and the absolute value

CornerAve(j) CenterAve

of the highest difference obtained for the 8 corners shall be annotated as the temperature variation in space

Figure 9 – Example of temperature gradient for chambers <2 000 L
4.5.7 Temperature rate of change

As shown in Figure 10, temperature rate of change between specified temperatures shall be

calculated with the following method, and indicated in K/min.
Temperature heat-up rate = Δt/T
Temperature cool-down rate = Δt/T
Temperature variation in space
---------------------- Page: 15 ----------------------
– 14 – IEC 60068-3-5:2018 © IEC 2018
Heat-up Cool-down
Time T Time T
1 2
Highest
100 %
temperature
90 %
10 %
Lowest
0 %
temperature
IEC
Figure 10 – Example of temperature rate of change
To measure temperature rate of change:
• adjust chamber to lowest specified temperature and allow to stabilize;

• adjust chamber to highest specified temperature, monitoring the time between the 10 %

and the 90 % points of the temperature range;
• allow chamber to stabilize at the highest specified temperature;

• adjust chamber to lowest specified temperature, monitoring the time between the 90 %

and 10 % points of temperature range.
4.6 Standard temperature sequence

The following test sequence is considered to be the minimum recommended to obtain the

necessary data for confirmation of the performance of a temperature chamber.
The test sequence is as follows:
• start at ambient conditions;

• adjust chamber to highest specified temperature and allow chamber to stabilize;

• measure performance at highest temperature;

• adjust chamber to lowest specified temperature, monitoring rate of change and allow

chamber to stabilize;
• measure performance at lowest temperature;
• adjust chamber to highest specified temperature, monitoring rate of change;
• adjust chamber to atmospheric conditions and allow chamber to stabilize;
• measure performance at atmospheric conditions.
5 Information to be given in the performance test report
As a minimum, the following information shall be contained in the test report.
---------------------- Page: 16 ----------------------
IEC 60068-3-5:2018 © IEC 2018 – 15 –
a) Atmospheric conditions in the test area for measurement.
b) Size and volume of chamber enclosure and working space.

c) Temperature fluctuation, temperature variation in space and temperature gradient.

d) Temperature rate of change.
e) Highest/Lowest temperature.
f) Measurement results from each measurement position.
g) Details of data acquisition systems.
...

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