GB/T 2423.45-2012Environmental testing - Part 2: Test methods - Test Z/ABDM: Climatic sequence (English PDF)

Foreword

This part is Part 45 of GB/T 2423.The parts of GB/T 2423 are shown in Informative

Appendix NA.

This part was drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces GB/T 2423.45-1997 Environmental testing for electric and electronic

products - Part 2.Test methods - Test Z/ABDM. Climatic sequence. Compared to GB/T

2423.45-1997, the main changes are as follows.

-- The degree of consistency differs (the 1997 version is an identical version, while

this version is a modified version);

-- The first paragraph of Chapter 1 has been edited.

-- Regarding normative references, the specific adjustments are as follows.

lambda GB/T 4797 has replaced IEC 60721-2;

lambda GB/T 4798 has replaced IEC 60721-3;

-- In Chapter 2, Chinese national standards that are identical to international

standards have been cited;

-- In Chapter 4, the content "When using a dedicated test chamber in which... in

the sequence are successively established" has been changed to "When using a

single test chamber in which... in the sequence are met";

-- In Chapter 5, the statement "The severity is defined by... the air pressure and the

duration of exposure, if the optional "low air pressure" step is required (Chapter

4 in IEC 68-2-3), and finally, the number of damp heat cycles according to 8.2.5

of this standard." has been changed to "The severity is defined by... the air

pressure and the duration of exposure [if the optional "low air pressure" step is

required (Chapter 4 in GB/T 2423.21-2008)], and finally, the number of damp

heat cycles according to 8.2.5 of this part";

-- The "test Aa" and "test Ba" in this part have been changed to "test Ab" and "test

Bb";

-- In Chapter 7, "be submitted to" has been changed to "carry out";

-- In 8.2.5, all "dimensional and functional inspection" has been changed to

"dimensional and functional check";

-- The content "(including 8.2.1 and 8.2.4)" has been removed from 8.3.1 and

"(including 8.2.1 and 8.2.3)" from 8.4.1;

-- In Figure 1, Figure 2, and Figure 3, "non-mandatory" has been changed to

"optional";

-- The column "IEC standards" in Figure 3 has been changed to "GB/T standards";

-- In Figure 4, "1 h 30" has been changed to "1.5 h";

-- In Appendix A.1, the statement "... at the final stage" has been changed to "...

at the end";

-- In Appendix B.3, "a dedicated test chamber" has been changed to "a single test

chamber";

-- The informative appendix "Parts of GB/T 2423" has been added (see Appendix

NA).

This part is modified in relation to IEC 60068-2-61.1991 Environmental testing - Part

2 Test methods - Test Z/ABDM. Climatic sequence by using the redrafting method.

The technical differences between this part and IEC 60068-2-61.1991, and the reasons

therefor, are as follows.

-- Regarding normative references, this part has been adjusted to reflect technical

differences in order to adapt to Chinese technical conditions. The specific

adjustments are as follows.

lambda GB/T 2423.1-2008, which is identical to IEC 60068-2-1.2007, has replaced

IEC 60068-2-1.1990;

lambda GB/T 2423.2-2008, which is identical to IEC 60068-2-2.2007, has replaced

IEC 60068-2-2.1974 and the first supplement IEC 60068-2-2A.1976;

lambda GB/T 2423.4-2008, which is identical to IEC 60068-2-30.2005, has

replaced IEC 60068-2-30.1980;

lambda GB/T 2424.2-2005, which is identical to IEC 60068-3-4.2001, has replaced

IEC 60068-2-28.1980;

lambda GB/T 4797 has replaced IEC 60721-2;

lambda GB/T 4798 has replaced IEC 60721-3;

Environmental testing - Part 2.Test methods - Test

Z/ABDM. Climatic sequence

1 Scope

This part of GB/T 2423 provides standard composite test methods for determining the

suitability of a specimen when subjected to environmental conditions consisting of a

sequence of temperature, humidity and, where required, low air pressure environmental

stresses.

The order of application of the stresses AND the conditions for the change from one

step to the next have been chosen to accelerate and amplify degradation mechanisms of

the same type as those observed under natural climatic conditions.

NOTE. Environmental conditions occurring in nature are classified in GB/T 4797 and GB/T 4798.

This part may be applied to other electrotechnical products when the degradation

mechanisms are the same and the specified requirements for testing can be satisfied. In

other cases, it may form a basis for the writing of a similar test.

In this test, specimens are exposed to environmental tests in a standard order and

categorized according to the basic code defined in Appendix A of GB/T 2421.1-2008

except that the third group of digits is used as an indication of the number of cycles in

Step 5 of the damp heat cyclic Test Db (see Chapter 5 in GB/T 2423.4-2008). In the

climatic categories -/-/56, 40/-/-, etc., in this part, the dashes may be replaced by any of

the standard values appropriate to the space, as in the following examples. 55/100/56,

25/085/56, 40/085/21.Where any modification is necessary, the relevant specification

shall provide the necessary information for each step in the selected method (see

Chapter 8).

This test is frequently specified to follow other tests involving mechanical stress, for

example, tests for robustness of terminations, solderability, shock and vibration, as a

means of determining whether the sealing of the specimen has been damaged.

2 Normative references

The following documents are essential for the application of this document. For any

dated reference, only the version corresponding to that date applies to this document;

for any undated reference, the latest version (including all amendments) applies to this

document.

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