Environmental Tests For Electric And Electronic Products – Part 2: Test Methods, Test m: Low Pressure

1. Introduction
1.1 scope
This part is applicable to low pressure test at room temperature.
The purpose of this test is to determine the adaptability of components, equipment or other products to storage, transportation or use under low air pressure.
Note: for products stored, transported or used under the comprehensive environment of high temperature and low pressure or low temperature and low pressure, this comprehensive environment is very important for the stress or failure mechanism imposed on the product, and the following standards shall be followed
Conduct the test:
-GB / T 2423.25 environmental testing for electric and electronic products Part 2: Test methods Test Z / am: low temperature / low pressure comprehensive test
-GB / T 2423.26 environmental testing of electric and electronic products Part 2: Test methods Test Z / BM: high temperature / low pressure comprehensive test
1.2 normative references
The terms in the following documents become the terms of this part through the application of this part of GB / t2423 standard. For dated documents, all subsequent amendments (excluding Corrigendum) or revisions are not applicable
In this part, however, parties to agreements under this part are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition is applicable to this part.
GB / T 2421 environmental testing for electric and electronic products – Part 1: General (GB / T 2421 – 1999, IEC 60068-1: 1988, IDT)
GB / T 2423.25 environmental testing for electric and electronic products Part 2: Test methods Test Z / am: low temperature / low pressure comprehensive test (GB / T 2423.25 – 2008, 1ec 60068-2-40:1983, IDT)
GB / T 2423.26 environmental testing for electric and electronic products Part 2: Test methods Test Z / BM: high temperature / low pressure comprehensive test (GB / T 2423.26 — 2008, 1ec 60068-2-41: 1983, IDT)
ISO 2533 standard atmosphere
2. – General description
Put the test sample into the high, low temperature and low pressure test chamber (chamber), then reduce the air pressure in the test chamber (chamber) to the value specified in relevant specifications, and maintain the test for the specified duration.
3. Test equipment
The high, low temperature and low pressure test chamber (chamber) shall have the ability to maintain the low pressure conditions specified in Chapter 4 of this part.
When the air pressure is restored to normal, attention shall be paid to avoid air pollution in the box due to auxiliary equipment, devices and unclean air.
When the heat dissipation test sample is tested, the relevant specifications can properly specify the test chamber (chamber) according to the requirements of GB / t2423.26.
4. Severity level
The severity level of air pressure and test duration shall be specified in relevant specifications, and its value shall be preferred from the provisions of 4.1 and 4.2.