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GB/T 2423.34-2024 English PDF (GBT2423.34-2024)

GB/T 2423.34-2024 English PDF (GBT2423.34-2024)

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GB/T 2423.34-2024: Environmental testing - Part 2: Test methods - Test Z/AD: Composite temperature/humidity cyclic test
GB/T 2423.34-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.040
CCS K 04
GB/T 2423.34-2024 / IEC 60068-2-38.2021
Replacing GB/T 2423.34-2012
Environmental Testing – Part 2.Test Methods – Test Z/AD.
Composite Temperature/Humidity Cyclic Test
(IEC 60068-2-38.2021, Environmental Testing – Part 2-38.Test Methods –
Test Z/AD. Composite Temperature/Humidity Cyclic Test, IDT)
ISSUED ON. AUGUST 23, 2024
IMPLEMENTED ON. MARCH 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 6
2 Normative References... 6
3 Terms and Definitions... 6
4 General... 7
4.1 Description of the test... 7
4.2 Application of the test... 8
5 Description of Test Chamber... 8
5.1 General... 8
5.2 Chamber for exposure to moisture... 9
5.3 Chamber for exposure to cold... 9
6 Severities... 10
7 Testing Procedure... 10
7.1 Preconditioning... 10
7.2 Initial measurements... 11
7.3 Conditioning... 12
7.4 Test cycle... 14
7.5 Final measurements... 18
8 Information to be Given in the Relevant Specification... 19
9 Information to be Given in the Test Report... 20
Annex A (Informative) Supporting Documentation for Test Sequence... 22
Annex NA (Informative) Parts of GB/T 2423... 25
Bibliography... 29
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This Document is Part 34 of GB/T 2423.The published parts of GB/T 2423 can refer to Annex
NA.
This Document replaced GB/T 2423.34-2012 Environmental Testing - Part 2.Test Methods -
Test Z/AD. Composite Temperature/Humidity Cyclic Test. Compared with GB/T 2423.34-2012,
the major technical changes of this Document are as follows besides the structural adjustments
and editorial modifications.
a) Add description of inapplicable scope in "Scope" (see Clause 1 of this Edition);
b) Change the content of "Test overview" (see 4.1 of this Edition, 3.1 of the 2012 Edition);
c) Change the requirements for humidification water in the "Wet heat test chamber" (see 5.2
of this Edition; 4.1 of the 2012 Edition);
d) Change the content of "Preconditioning" (see 7.1 of this Edition; 6.1 of the 2012 Edition);
e) Change the steps and humidity values in "Description of temperature/humidity sub-cycle",
"Description of low temperature sub-cycle" and "Description of 24 h cycle without low
temperature exposure" (see 7.4.1, 7.4.2, 7.4.3 of this Edition; 6.4.1, 6.4.2, 6.4.3 of the
2012 Edition);
f) Add the content of "Intermediate testing" (see 7.4.5 of this Edition);
g) Change the content of "Information to be given in the test report" (see Clause 9 of this
Edition; Clause 8 of the 2012 Edition).
This Document equivalently adopted IEC 60068-2-38.2021 Environmental Testing – Part 2-38.
Tests – Test Z/AD. Composite Temperature/Humidity Cyclic Test.
This Document made the minimum editorial modifications as follows.
--- To coordinate with the existing standard, change the standard name into Environmental
Testing – Part 2.Test Methods – Test Z/AD. Composite Temperature/Humidity Cyclic
Test;
--- Add Annex NA (Informative) “Parts of GB/T 2423”.
Please note some contents of this Document many involve patents. The issuing agency of this
Document shall not assume the responsibility to identify these patents.
Environmental Testing – Part 2.Test Methods
– Test Z/AD. Composite Temperature/Humidity Cyclic Test
1 Scope
This Document specifies a composite test procedure, primarily intended for component type
specimens, to determine, in an accelerated manner, the resistance of specimens to the
deteriorative effects of high temperature/humidity and cold conditions.
This Document does not apply to specimens that are energized during the complete test.
Specimens can be energized during the constant phases of the tests. Measurements on energized
specimens are typically carried out during constant phases of the test unless specified otherwise.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
IEC 60068-1 Environmental testing – Part 1.General and guidance
NOTE. GB/T 2421-2020 Environmental testing – General and guidance (IEC 60068-1.2013, IDT)
IEC 60068-2-67 Environmental testing – Part 2-67.Tests – Test Cy. Damp heat, steady
state, accelerated test primarily intended for components
NOTE. GB/T 2423.50-2012 Environmental testing - Part 2.Test methods - Test Cy. Damp heat,
steady state, accelerated test primarily intended for components (IEC 60068-2-67.1995, IDT)
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.

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