GB/T 2423.27-2020

Environmental testing—Part 2: Test methods—Test method and guidance: Combined temperature or temperature and humidity with low air pressure tests (English Version)

GB/T 2423.27-2020
Standard No.
GB/T 2423.27-2020
Language
Chinese, Available in English version
Release Date
2020
Published By
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest
GB/T 2423.27-2020
Replace
GB/T 2423.25-2008 GB/T 2423.26-2008 GB/T 2423.27-2005
Scope
This part of GB/T2423 gives the test methods and guidelines for the temperature/low pressure or temperature/humidity/low pressure comprehensive test of equipment or components. The purpose of the comprehensive test is to study the degree of influence of the temperature/low pressure or temperature/humidity/low pressure comprehensive test on the equipment or components. Comprehensive test methods are used to evaluate electrical, mechanical or other physical properties.
Introduction

Interpretation of the core content of the standard

This standard integrates the three versions of GB/T 2423.25-2008, GB/T 2423.26-2008 and GB/T 2423.27-2005, and realizes the systematic integration of temperature, humidity and low pressure tests for the first time. The test equipment is recommended to use a composite environmental test chamber, which must have the ability to accurately control temperature (-55℃~155℃), humidity (10%RH~95%RH) and air pressure (5kPa~70kPa).

Comparison Analysis of Test Parameters

Test Type Temperature Range Air Pressure Range Typical Holding Time
Low Temperature/Low Air Pressure -55℃~-25℃ 5~55kPa 2~16h
High Temperature/Low Air Pressure 40℃~155℃ 5~70kPa 2~16h
Temperature and Humidity/Low Air Pressure 0℃~55℃ 15~55kPa Including humidity stabilization time

Key technical requirements

Change rate control:Temperature change ≤1K/min, air pressure change ≤15kPa/min. A case of aerospace components shows that exceeding this rate will increase the seal rupture rate by 37%.

Temperature stability determination:According to IEC60068-1, the temperature deviation of the hottest/coldest point of the sample from the set value is ≤2℃ and the change rate is <0.5℃/min.

Implementation recommendations

  1. Give priority to the 24 severity level combinations recommended in Table 1
  2. Note that when testing humidity: when the temperature is below 0°C, low pressure conditions should be maintained until frost forms
  3. For heat dissipation samples, it is recommended to add surface temperature monitoring points

Standard evolution analysis

Main improvements compared to the 2005 version: ① Delete the distinction between heat dissipation/non-heat dissipation samples; ② Add a test guide appendix; ③ Unify the report formats of the three test methods. These changes keep the standard in sync with IEC60068-2-39:2015 and are more suitable for emerging fields such as new energy vehicles, aerospace, etc.

GB/T 2423.27-2020 Referenced Document

  • IEC 60068-1 Environmental testing - Part 1: General and guidance

GB/T 2423.27-2020 history

  • 2020 GB/T 2423.27-2020 Environmental testing—Part 2: Test methods—Test method and guidance: Combined temperature or temperature and humidity with low air pressure tests
  • 2005 GB/T 2423.27-2005 Environmental testing for electric and electronic products.Part 2:Test Methods Test Z/AMD:Combined sequential cold,low air pressure and damp heat test
  • 1981 GB/T 2423.27-1981 Electric and electronic products--Basic environmental test regulations for electricians--Test Z/AMD: The successive integrated low temperature/low atmospheric pressure/damp-heat method

GB/T 2423.27-2020 has been changed from GB/T 2423.25-2008 Environmental testing for electric and electronic products.Part2:Tsets Tset Z/AM:Combined cold/low air pressure tests.

GB/T 2423.27-2020 has been changed from GB/T 2423.26-2008 Environmental testing for electric and electronic products.Part 2 Test methods TestZ/BM:Combined dry heat/low air pressure tests.

GB/T 2423.27-2020 -All Parts

GB/T 2423.1-2008 Environmental testing for electric and electronic products.Part 2:Test methods.Tests A:Cold GB/T 2423.10-2019 Environmental testing—Part 2:Test methods—Test Fc:Vibration(sinusoidal) GB/T 2423.101-2008 Environmental testing for electric and electronic products.Part 2:Test methods.Test: Inclinations and swings GB/T 2423.102-2008 Environmental testing for electric and electronic products.Part 2:Test method.Test:combined temperature(cold and heat)/low air pressure/vibration(sinusoidal) GB/T 2423.11-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fd: Random vibration wide band--General requirements GB/T 2423.12-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fda: Random vibration wide band--Reproducibility high GB/T 2423.13-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fdb: Random vibration wide band--Reproducibility medium GB/T 2423.14-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fdc: Random vibration wide band--Reproducibility low GB/T 2423.15-2008 Environmental testing for electric and electronic products.Part 2:Tests methods.Test Ga and guidance:Acceleration,steady GB/T 2423.16-2022 Environmental testing—Part 2: Test methods—Test J and guidance: Mould growth GB/T 2423.17-2024 Environmental testing Part 2: Test methods Test Ka: Salt spray GB/T 2423.18-2021 Environmental testing—Part 2: Test methods—Test Kb:Salt mist, cyclic（sodium chloride solution） GB/T 2423.19-2013 Environmental testing.Part 2:Test methods.Test Kc:Sulphur dioxide test for contacts and connections GB/T 2423.2-2008 Environmental testing for electric and electronic products.Part 2:Test methods.Tests B:Dry heat GB/T 2423.20-2014 Environmental testing.Part 2: Test methods.Test Kd: Hydrogen sulphide test for contacts and connections GB/T 2423.21-2008 Environmental testing for electric and electronic products.Part 2 Test methods Test M:Low air pressure GB/T 2423.22-2012 Environmental testing.Part 2:Test methods.Test N:Change of temperature GB/T 2423.23-2013 Environmental testing.Part 2:Test methods.Test Q:Sealing GB/T 2423.24-2022 Environmental testing—Part 2: Test methods—Test S: Simulated solar radiation at ground level and guidance for solar radiation testing and weathering GB/T 2423.25-2008 Environmental testing for electric and electronic products.Part2:Tsets Tset Z/AM:Combined cold/low air pressure tests GB/T 2423.26-2008 Environmental testing for electric and electronic products.Part 2 Test methods TestZ/BM:Combined dry heat/low air pressure tests GB/T 2423.27-2020 Environmental testing—Part 2: Test methods—Test method and guidance: Combined temperature or temperature and humidity with low air pressure tests GB/T 2423.28-2005 Environmental testing for electric and electronic products.Part2:Test methods-Test T:Soldering GB/T 2423.29-1999 Environmental testing for electric and electronic products-- Part 2:Test methods Test U:robustness of terminations and integral mounting devices GB/T 2423.3-2016 Environmental testing—Part 2：Testing method—Test Cab:Damp heat,steady state


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