ISO 9022-23:2023

INTERNATIONAL ISO
STANDARD 9022-23
Third edition
Optics and photonics —
Environmental test methods —
Part 23:
Low pressure combined with cold,
ambient temperature and dry or damp
heat
Optique et photonique — Méthodes d'essais d'environnement —
Partie 23: Basse pression combinée à la température ambiante et
froide et à la chaleur sèche ou humide
PROOF/ÉPREUVE
Reference number
ISO 9022-23:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 9022-23:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
PROOF/ÉPREUVE © ISO 2023 – All rights reserved

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ISO 9022-23:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General information and test conditions . 1
5 Conditioning . 2
5.1 Conditioning method 45 — Low ambient pressure combined with ambient
temperature . 2
5.2 Conditioning method 46 — Low ambient pressure combined with dry heat . 2
5.3 Conditioning method 47 — Low internal pressure combined with damp heat,
pressure difference low . 3
5.4 Conditioning method 48 — Low internal pressure combined with damp heat,
pressure difference medium . 4
5.5 Conditioning method 49 — Low internal pressure combined with damp heat,
pressure difference high . 5
5.6 Conditioning method 50 — Low ambient pressure combined with cold, including
hoarfrost and dew . 6
5.7 Conditioning method 51 — Low ambient pressure combined with cold, without
hoarfrost and dew . 6
6 Procedure .6
6.1 General . 6
6.2 Procedure for conditioning method 45 . 6
6.3 Procedure for conditioning method 46 . 7
6.4 Procedure for conditioning method 47 . 7
6.4.1 Initial and final inspection . 7
6.4.2 Preliminary test 1 . 7
6.4.3 Preliminary test 2 . 7
6.4.4 Condition 1 . . 7
6.4.5 Conditions 2 and 3 . 8
6.5 Procedure for conditioning method 48 . 8
6.5.1 Initial and final inspection . 8
6.5.2 Preliminary test . 8
6.5.3 Condition 1 . . 8
6.5.4 Conditions 2 and 3 . 8
6.6 Procedure for conditioning method 49 . 8
6.6.1 Initial and final inspection . 8
6.6.2 Preliminary test . 8
6.6.3 Conditions 3 and 4 . 8
6.7 Procedure for conditioning method 50 . 8
6.8 Procedure for conditioning method 51. 9
7 Environmental test code . 9
8 Specification .10
Annex A (informative) Explanatory notes .11
Bibliography .13
iii
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ISO 9022-23:2023(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 172, Optics and Photonics, Subcommittee
SC 1, Fundamental standards.
This third edition cancels and replaces the second edition (ISO 9022-23:2016), which has been
technically revised.
The main changes are as follows:
— Introductory sentences of 5.3, 5.4 and 5.5 were clarified,
— Clause 3 was included and the document renumbered.
A list of all parts in the ISO 9022 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
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ISO 9022-23:2023(E)
Introduction
Optical instruments are affected during their use by a number of different environmental parameters
which they are required to resist without significant reduction in performance and to remain within
defined specifications.
The type and severity of these parameters depend on the conditions of use of the instrument (for
example, in the laboratory or workshop) and on its geographical location. The environmental effects
on optical instrument performance in the tropics and subtropics are totally different from those found
when they are used in arctic regions. Individual parameters cause a variety of different and overlapping
effects on instrument performance.
The manufacturer attempts to ensure, and the user naturally expects, that instruments will resist the
likely rigours of their environment throughout their life. This expectation can be assessed by exposure
of the instrument to a range of simulated environmental parameters under controlled laboratory
conditions. The severity of these conditions is often increased to obtain meaningful results in a
relatively short period of time.
In order to allow assessment and comparison of the response of optical instruments to appropriate
environmental conditions, ISO 9022 (all parts) contains details of a number of laboratory tests which
reliably simulate a variety of different environments. The tests are based largely on IEC standards,
modified where necessary to take into account features special to optical instruments.
As a result of continuous progress in all fields, optical instruments are no longer only precision-
engineered optical products, but, depending on their range of application, also contain additional
assemblies from other fields. For this reason, the principal function of the instrument is to be assessed
to determine which International Standard should be used for testing. If the optical function is of
primary importance, then ISO 9022 (all parts) is applicable, but if other functions take precedence,
then the appropriate International Standard in the field concerned should be applied. Cases may arise
where application of both ISO 9022 (all parts) and other appropriate International Standards will be
necessary.
v
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INTERNATIONAL STANDARD ISO 9022-23:2023(E)
Optics and photonics — Environmental test methods —
Part 23:
Low pressure combined with cold, ambient temperature
and dry or damp heat
1 Scope
This document specifies the methods relating to the environmental tests of optical instruments
including additional assemblies from other fields (e.g. mechanical, chemical, and electronic devices),
under equivalent conditions, for their ability to resist the influence of low pressure combined with cold,
including the potential condensation and freezing of moisture, ambient temperature, and dry or damp
heat.
This document is applicable to optical instruments including additional assemblies from other fields,
designed for operation and/or transport in high mountainous areas or on board aircraft or missiles.
The purpose of the testing is to investigate to what extent optical, climatic, mechanical, chemical,
and electrical (including electrostatic) performance characteristics of the specimen are affected by
combined low pressure and low, ambient, or high temperature. Furthermore, the additional effects of
moisture condensing and freezing on the instrument or components can be determined. Examples are
instruments which are installed or externally mounted on aircraft or missiles or transported inside
aircraft or flying objects not providing any pressure equalization.
Annex A explains the intent of the different types of tests.
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.
ISO 9022-1, Optics and photonics — Environmental test methods — Part 1: Definitions, extent of testing
ISO 9022-8, Optics and photonics — Environmental test methods — Part 8: High internal pressure, low
internal pressure, immersion
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 General information and test conditions
Ambient temperature as understood by this document is (23 ± 3) °C.
1
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ISO 9022-23:2023(E)
The values of temperatures and climatic conditions specified in Table 1 to Table 6 are selected from
ISO 9022-2, conditioning methods 10, 11, and 12.
The size of the test chamber and the setup of the specimens shall be chosen in such a way that a uniform
temperature for all specimens within the test chamber is ensured.
For conditioning methods 45, 46, 50, and 51, air circulation in low-pressure cabinets or low-pressure
chambers is required. The low-pressure chamber, itself, can either be equipped as a thermal chamber
or be installed in a thermal chamber.
For conditioning methods 47 to 49, a climatic test chamber is required. Three different test methods are
used to test combined damp heat and low internal pressure resistance of optical instruments. Dew on
the specimen is admissible. The individual test steps shall be performed directly one after another.
Interruption of the test is not admissible.
In addition for conditioning method 47, if condensation is produced, the specimens shall be protected
against falling drops.
In addition for conditioning method 48, a low-pressure container is also required.
In addition for conditioning method 49, the specimens shall have a test connection for evacuation and
pressure measurement, as specified in ISO 9022-8.
Changes in temperature shall be effected sufficiently slowly not to cause any damage to the specimen.
Shock-type air pressure changes shall be avoided unless they are likely to be encountered in the natural
environment.
5 Conditioning
5.1 Conditioning method 45 — Low ambient pressure combined with ambient
temperature
See Table 1.
Table 1 — Degrees of severity for conditioning method 45 — Low ambient pressure combined
with ambient temperature
Degree of severity 01 02 03 04
Test chamber temperature °C 23 ± 3 23 ± 3 23 ± 3 23 ± 3
Test chamber pressure hPa 800 ± 30 700 ± 30 600 ± 30 500 ± 30
Time of pressure reduction
min ≤15
and pressure increase
a
Period of conditioning h ≥ 1
State of operation 2 2 2 2
a
With thermally active specimens after the steady-state temperature of the specimen has been reached.
5.2 Conditioning method 46 — Low ambient pressure combined with dry heat
See Table 2.
2
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ISO 9022-23:2023(E)
Table 2 — Degrees of severity for conditioning method 46 — Low ambient pressure combined
with dry heat
Degree of
01 02 03 04 05 06 07 08 09 10 11 12
severity
Test
a a a
chamber °C 40 ± 3 40 ± 3 55 ± 3 55 ± 3 63 ± 3 63 ± 3 85 ± 3 85 ± 3 40 ± 3 55 ± 3 63 ± 3 85 ± 3
temperature
Test
chamber hPa 100 ± 5 10 ± 1
pressure
Time of
pressure re-
duction and min ≤15 ≤80
pressure
increase
Mean
temperature
change dur- K/min 0,2 to 2
ing heating/
cooling
Exposure
h 24 72 24 72 24 72 24 72 24 24 24 24
time
State of
1 or 2
operation
a
State of operation 1 only.
5.3 Conditioning method 47 — Low internal pressure combined with damp heat,
pressure difference low
See Table 3 and Figure 1.
Conditioning method 47 shall be used for optical instruments where demands made on their sealing
(low pressure resistance) are low. Examples of instruments with low pressure differences would be
systems that comply with the requirements of the degrees of severity 01, 02, 07, or 08 of conditioning
method 81 in ISO 9022-8.
Table 3 — Degrees of severity for conditioning method 47 — Low internal pressure combined
with damp heat, pressure difference low
Degree of severity 01 02 03 04 05 06
Test chamber
°C 55 ± 2 63 ± 2 70 ± 2
temperature
Relative humidity % <40
Step 1
Until the internal air of the specimen has reached
Exposure time h a temperature at least within 3 K of the test chamber
Condition 1
temperature.
Climatic conditions 40 °C ± 2 °C and 90 % to 95 % relative humidity.
Step 2
Exposure time h ≥1
Number of cycles 6 12 6 12 6 12
Test chamber temperature °C −10 ± 3
Condition 2
Until specimen has reached a temperature at least
Exposure time h
within 3 K of the test chamber temperature.
Test chamber temperature °C 40 ± 2
Relative humidity % <40
Condition 3
Until specimen has reached a temperature at least
Exposure time h
within 3 K of the test chamber temperature.
3
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ISO 9022-23:2023(E)
TTabablele 3 3 ((ccoonnttiinnueuedd))
Degree of severity 01 02 03 04 05 06
State of operation 1
Key
X duration, h 4 duration according to Table 1
T temperature, °C 5 relative humidity, <40 %
1 condition 1 6 relative humidity, 90 % to 95 %
2 condition 2 7 relative humidity, <40 %
3 condition 3
Figure 1 — Cycling curve for conditioning method 47, using example of degree of severity 01
5.4 Conditioning method 48 — Low internal pressure combined with damp heat,
pressure difference medium
See Table 4.
Conditioning method 48 shall be used for optical instruments where demands made on their sealing
(low pressure resistance) are medium. Examples of instruments with medium pressure differences
would be systems
...

2023-01-21
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ISO/FDISPRF 9022-23:2023(E)
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at 18 pt
ISO TC 172/SC 1/WG 3
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2023-xx
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Secretariat: DIN
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Style Definition: ANNEX
Optics and photonics — Environmental test methods — Part 23: Low pressure combined
with cold, ambient temperature and dry or damp heat
Style Definition: AMEND Terms Heading: Font: Bold
Style Definition: AMEND Heading 1 Unnumbered:
Optique et photonique — Méthodes d'essais d'environnement — Partie 23: Basse pression
Font: Bold
combinée à la température ambiante et froide et à la chaleur sèche ou humide

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ISO/PRF 9022-23:2023(E)
© ISO 2023
Formatted: Pattern: Clear
Formatted: Pattern: Clear
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part
of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or
mechanical, including photocopying, or posting on the internet or an intranet, without prior written
permission. Permission can be requested from either ISO at the address below or ISO’s member body
in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/PRF 9022-23:2023(E)
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General information and test conditions . 2
5 Conditioning . 2
5.1 Conditioning method 45 — Low ambient pressure combined with ambient
temperature . 2
5.2 Conditioning method 46 — Low ambient pressure combined with dry heat . 2
5.3 Conditioning method 47 — Low internal pressure combined with damp heat,
pressure difference low . 3
5.4 Conditioning method 48 — Low internal pressure combined with damp heat,
pressure difference medium . 5
5.5 Conditioning method 49 — Low internal pressure combined with damp heat,
pressure difference high . 5
5.6 Conditioning method 50 — Low ambient pressure combined with cold, including
hoarfrost and dew . 6
5.7 Conditioning method 51 — Low ambient pressure combined with cold, without
hoarfrost and dew . 6
6 Procedure . 7
6.1 General . 7
6.2 Procedure for conditioning method 45 . 7
6.3 Procedure for conditioning method 46 . 7
6.4 Procedure for conditioning method 47 . 7
6.4.1 Initial and final inspection . 7
6.4.2 Preliminary test 1 . 8
6.4.3 Preliminary test 2 . 8
6.4.4 Condition 1 . 8
6.4.5 Conditions 2 and 3 . 8
6.5 Procedure for conditioning method 48 . 8
6.5.1 Initial and final inspection . 8
6.5.2 Preliminary test . 8
6.5.3 Condition 1 . 8
6.5.4 Conditions 2 and 3 . 8
6.6 Procedure for conditioning method 49 . 9
6.6.1 Initial and final inspection . 9
6.6.2 Preliminary test . 9
6.6.3 Conditions 3 and 4 . 9
6.7 Procedure for conditioning method 50 . 9
6.8 Procedure for conditioning method 51 . 9
7 Environmental test code . 10
8 Specification . 10
Annex A (informative) Explanatory notes . 11
A.1 Conditioning method 47 . 11
© ISO 2023 – All rights reserved iii

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ISO/PRF 9022-23:2023(E)
A.2 Conditioning method 48 . 11
A.3 Conditioning method 49 . 11
A.4 Conditioning methods 50 and 51 . 11
A.5 Example of conditioning method 50 . 12
Bibliography
. 13Fore
word . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General information and test conditions . 2
5 Conditioning . 2
5.1 Conditioning method 45 — Low ambient pressure combined with ambient
temperature . 2
5.2 Conditioning method 46 — Low ambient pressure combined with dry heat . 2
5.3 Conditioning method 47 — Low internal pressure combined with damp heat,
pressure difference low . 3
5.4 Conditioning method 48 — Low internal pressure combined with damp heat,
pressure difference medium . 5
5.5 Conditioning method 49 — Low internal pressure combined with damp heat,
pressure difference high . 5
5.6 Conditioning method 50 — Low ambient pressure combined with cold, including
hoarfrost and dew . 6
5.7 Conditioning method 51 — Low ambient pressure combined with cold, without
hoarfrost and dew . 6
6 Procedure . 7
6.1 General . 7
6.2 Procedure for conditioning method 45 . 7
6.3 Procedure for conditioning method 46 . 7
6.4 Procedure for conditioning method 47 . 7
6.4.1 Initial and final inspection . 7
6.4.2 Preliminary test 1 . 8
6.4.3 Preliminary test 2 . 8
6.4.4 Condition 1 . 8
6.4.5 Conditions 2 and 3 . 8
6.5 Procedure for conditioning method 48 . 8
6.5.1 Initial and final inspection . 8
6.5.2 Preliminary test . 8
6.5.3 Condition 1 . 8
6.5.4 Conditions 2 and 3 . 8
6.6 Procedure for conditioning method 49 . 9
6.6.1 Initial and final inspection . 9
6.6.2 Preliminary test . 9
6.6.3 Conditions 3 and 4 . 9
6.7 Procedure for conditioning method 50 . 9
6.8 Procedure for conditioning method 51 . 9
7 Environmental test code . 10
iv © ISO 2023 – All rights reserved

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ISO/PRF 9022-23:2023(E)
8 Specification . 10
Annex A (informative) Explanatory notes . 11
Bibliography . 13
© ISO 2023 – All rights reserved v

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ISO/PRF 9022-23:2023(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directiveswww.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patentswww.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 172, Optics and Photonics, Subcommittee
SC 1, Fundamental standards.
This third edition cancels and replaces the second edition (ISO 9022-23:2016), which has been
Formatted: Pattern: Clear
technically revised.
Formatted: Pattern: Clear
Formatted: Pattern: Clear
The main changes are as follows:
Formatted: Pattern: Clear
— Introductory sentences of 5.3, 5.4 and 5.5 were clarified,
Formatted: Pattern: Clear
— Clause 3 was included and the document renumbered.
Formatted: Pattern: Clear
A list of all parts in the ISO 9022 series can be found on the ISO website.
Formatted: Pattern: Clear
Formatted: Pattern: Clear
Any feedback or questions on this document should be directed to the user’s national standards body. A
Formatted: Pattern: Clear
complete listing of these bodies can be found at
www.iso.org/members.htmlwww.iso.org/members.html.
vi © ISO 2023 – All rights reserved

---------------------- Page: 6 ----------------------
ISO/PRF 9022-23:2023(E)
Introduction
Optical instruments are affected during their use by a number of different environmental parameters
which they are required to resist without significant reduction in performance and to remain within
defined specifications.
The type and severity of these parameters depend on the conditions of use of the instrument (for
example, in the laboratory or workshop) and on its geographical location. The environmental effects on
optical instrument performance in the tropics and subtropics are totally different from those found when
they are used in arctic regions. Individual parameters cause a variety of different and overlapping effects
on instrument performance.
The manufacturer attempts to ensure, and the user naturally expects, that instruments will resist the
likely rigours of their environment throughout their life. This expectation can be assessed by exposure of
the instrument to a range of simulated environmental parameters under controlled laboratory
conditions. The severity of these conditions is often increased to obtain meaningful results in a relatively
short period of time.
In order to allow assessment and comparison of the response of optical instruments to appropriate
environmental conditions, the ISO 9022-series (all parts) contains details of a number of laboratory tests
Formatted: Pattern: Clear
which reliably simulate a variety of different environments. The tests are based largely on IEC standards,
Formatted: Pattern: Clear
modified where necessary to take into account features special to optical instruments.
As a result of continuous progress in all fields, optical instruments are no longer only precision-
engineered optical products, but, depending on their range of application, also contain additional
assemblies from other fields. For this reason, the principal function of the instrument is to be assessed to
determine which International Standard should be used for testing. If the optical function is of primary
importance, then the ISO 9022-series (all parts) is applicable, but if other functions take precedence, then
Formatted: Pattern: Clear
the appropriate International Standard in the field concerned should be applied. Cases may arise where
Formatted: Pattern: Clear
application of both the ISO 9022-series (all parts) and other appropriate International Standards will be
Formatted: Pattern: Clear
necessary.
Formatted: Pattern: Clear
© ISO 2023 – All rights reserved vii

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INTERNATIONAL STANDARD ISO/PRF 9022-23:2023(E)

Optics and photonics — Environmental test methods — Part 23:
Low pressure combined with cold, ambient temperature and dry
or damp heat
1 Scope
This document specifies the methods relating to the environmental tests of optical instruments including
additional assemblies from other fields (e.g. mechanical, chemical, and electronic devices), under
equivalent conditions, for their ability to resist the influence of low pressure combined with cold,
including the potential condensation and freezing of moisture, ambient temperature, and dry or damp
heat.
This document is applicable to optical instruments including additional assemblies from other fields,
designed for operation and/or transport in high mountainous areas or on board aircraft or missiles.
The purpose of the testing is to investigate to what extent optical, climatic, mechanical, chemical, and
electrical (including electrostatic) performance characteristics of the specimen are affected by combined
low pressure and low, ambient, or high temperature. Furthermore, the additional effects of moisture
condensing and freezing on the instrument or components can be determined. Examples are instruments
which are installed or externally mounted on aircraft or missiles or transported inside aircraft or flying
objects not providing any pressure equalization.
Annex A explains the intent of the different types of tests.
Formatted: Pattern: Clear
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.
ISO 9022-1, Optics and photonics — Environmental test methods — Part 1: Definitions, extent of
testing
Formatted: Pattern: Clear
ISO 9022-1, Optics and photonics — Environmental test methods — Part 1: Definitions, extent of
testing
Formatted: Pattern: Clear
Formatted: Pattern: Clear
ISO 9022-8, Optics and photonics — Environmental test methods — Part 8: High internal pressure, low
Formatted: Pattern: Clear
internal pressure, immersion
Formatted: English (United States)
Formatted: Hyperlink, English (United States)
3 Terms and definitions
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers, Tab
No terms and definitions are listed in this document.
stops: Not at 19.85 pt + 39.7 pt + 59.55 pt + 79.4 pt
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
+ 99.25 pt + 119.05 pt + 138.9 pt + 158.75 pt +
178.6 pt + 198.45 pt
— ISO Online browsing platform: available at https://www.iso.org/obphttps://www.iso.org/obp
Formatted: English (United States)
— IEC Electropedia: available at https://www.electropedia.org/https://www.electropedia.org/
Formatted: Hyperlink, English (United States)
© ISO 2023 – All rights reserved 1

---------------------- Page: 8 ----------------------
ISO/PRF 9022-23:2023(E)
4 General information and test conditions
Ambient temperature as understood by this document is (23 ± 3) °C.
The values of temperatures and climatic conditions specified in Table 1 to Table 6 are selected from
Formatted: Pattern: Clear
ISO 9022-2, conditioning methods 10, 11, and 12.
Formatted: Pattern: Clear
The size of the test chamber and the setup of the specimens shall be chosen in such a way that a uniform
Formatted: Pattern: Clear
temperature for all specimens within the test chamber is ensured.
Formatted: Pattern: Clear
For conditioning methods 45, 46, 50, and 51, air circulation in low-pressure cabinets or low-pressure
Formatted: Pattern: Clear
chambers is required. The low-pressure chamber, itself, can either be equipped as a thermal chamber or
be installed in a thermal chamber.
For conditioning methods 47 to 49, a climatic test chamber is required. Three different test methods are
used to test combined damp heat and low internal pressure resistance of optical instruments. Dew on the
specimen is admissible. The individual test steps shall be performed directly one after another.
Interruption of the test is not admissible.
In addition for conditioning method 47, if condensation is produced, the specimens shall be protected
against falling drops.
In addition for conditioning method 48, a low-pressure container is also required.
In addition for conditioning method 49, the specimens shall have a test connection for evacuation and
pressure measurement, as specified in ISO 9022-8.
Formatted: Pattern: Clear
Changes in temperature shall be effected sufficiently slowly not to cause any damage to the specimen. Formatted: Pattern: Clear
Shock-type air pressure changes shall be avoided unless they are likely to be encountered in the natural
Formatted: Pattern: Clear
environment.
5 Conditioning
5.1 Conditioning method 45 — Low ambient pressure combined with ambient
temperature
See Table 1.
Formatted: Pattern: Clear
Table 1 — Degrees of severity for conditioning method 45 — Low ambient pressure combined
with ambient temperature
Degree of severity  01 02 03 04
Formatted: Font: Bold
Test chamber temperature °C 23 ± 3 23 ± 3 23 ± 3 23 ± 3
Test chamber pressure hPa 800 ± 30 700 ± 30 600 ± 30 500 ± 30
Time of pressure reduction
min ≤ 15
and pressure increase
a
Period of conditioning h ≥ 1
State of operation  2 2 2 2
a
With thermally active specimens after the steady-state temperature of the specimen has been reached.
5.2 Conditioning method 46 — Low ambient pressure combined with dry heat
See Table 2.
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ISO/PRF 9022-23:2023(E)
Table 2 — Degrees of severity for conditioning method 46 — Low ambient pressure combined
with dry heat
Table 2 — Degrees of severity for conditioning method 46 — Low ambient pressure combined
with dry heat
Degree of
01 02 03 04 05 06 07 08 09 10 11 12
severity
Test
chamber 85 ± 3 85 ± 3 85 ± 3
°C 40 ± 3 40 ± 3 55 ± 3 55 ± 3 63 ± 3 63 ± 3 40 ± 3 55 ± 3 63 ± 3
a a a
temperatur
e
Test
chamber hPa 100 ± 5 10 ± 1
pressure
Time of
pressure
reduction
min ≤ 15 ≤ 80
and
pressure
increase
Mean
temperatur
e change K/mi
0,2 to 2
during n
heating/
cooling
Exposure
h 24 72 24 72 24 72 24 72 24 24 24 24
time
State of
 1 or 2
operation
a
State of operation 1 only.
5.3 Conditioning method 47 — Low internal pressure combined with damp heat,
pressure difference low
See Table 3 and Figure 1.
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Conditioning method 47 shall be used for optical instruments where demands made on their sealing (low Formatted: Pattern: Clear
pressure resistance) are low. Examples of instruments with low pressure differences would be systems
that comply with the requirements of the degrees of severity 01, 02, 07, or 08 of conditioning method 81
in ISO 9022-8.
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Formatted: Pattern: Clear
Table 3— Degrees of severity for conditioning method 47 — Low internal pressure combined
Formatted: Pattern: Clear
with damp heat, pressure difference low
Degree of severity 01 02 03 04 05 06
Test chamber
°C 55 ± 2 63 ± 2 70 ± 2
temperature
Condition 1 Step 1
Relative humidity % <40
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ISO/PRF 9022-23:2023(E)
Until the internal air of the specimen has reached
Exposure time h a temperature at least within 3 K of the test chamber
temperature.
Climatic conditions  40 °C ± 2 °C and 90 % to 95 % relative humidity.
Step 2
Exposure time h ≥1
Number of cycles 6 12 6 12 6 12
Test chamber temperature °C −10 ± 3
Condition 2
Until specimen has reached a temperature at least
Exposure time h
within 3 K of the test chamber temperature.
Test chamber temperature °C 40 ± 2
Relative humidity % <40
Condition 3
Until specimen has reached a temperature at least
Exposure time h
within 3 K of the test chamber temperature.
State of operation 1
9022-23_ed3fig1.EPS

Key
X duration, h 4 duration according to Table 1
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T temperature, °C 5 relative humidity, < 40 %
1 condition 1 6 relative humidity, 90 % to 95 %
2 condition 2 7 relative humidity, < 40 %
3 condition 3
Figure 1 — Cycling curve for conditioning method 47, using example of degree of severity 01
5.4 Conditioning method 48 — Low internal pressure combined with damp heat,
pressure difference medium
See Table 4.
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ISO/PRF 9022-23:2023(E)
Conditioning method 48 shall be used for optical instruments where demands made on their sealing (low
pressure resistance) are medium. Examples of instruments with medium pressure differences would be
systems that comply with the requirements of the degrees of severity 03, 04, 09, or 10 of conditioning
method 81 in ISO 9022-8.
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Formatted: Pattern: Clear
Table 4— Degrees of severity for condition
...