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2025-07-10
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In the IEC60068-2 specification, temperature and humidity test chamber for the implementation of humidity and heat test as many as five types, in addition to everyone's common 85 ℃ / 85% R.H., 40 ℃ / 93% R.H. Fixed-point high temperature and high humidity, there are two more special test [IEC60068-2-30, IEC60068-2-38], these two are alternating humidity and heat cycle and temperature Humidity combined cycle, so the test process temperature and humidity will change, and even have multiple program links and cycles, applied in IC semiconductors, parts, equipment, with the help of temperature and humidity test chamber to simulate outdoor condensation phenomenon, to assess the ability of the material to prevent the diffusion of moisture to accelerate the product's resistance to degradation, the five specifications are organized into a comparative table of the differences between the specifications of the hot and humid test, and for the combination of hot and humid test cycle test in more detail. The test points are explained, and supplement the GJB test conditions and points in the hot and humid test.
Description: In IEC60068-2-30 alternating heat and humidity cycle test, temperature and humidity test chamber needs to maintain a specific humidity and temperature changes to produce respiratory effect to allow moisture to penetrate the sample, so that the surface of the product to be side of the condensation (condensation) phenomenon, to confirm the components, equipment or other products in the high humidity and temperature and humidity cycle under the combination of changes to confirm that to be side of the product in the use of the adaptability of transportation, storage, this The specification is also suitable for larger test samples, such as equipment and test processes need to be kept energized to heat the components for this test, the effect will be better than IEC60068-2-38, the high temperature used in this test there are two (40 ° C, 55 ° C), 40 ° C to meet the majority of the world's high-temperature environments, while 55 ° C to meet the world's high-temperature environments, the test conditions are also divided into [Cycle one, The test conditions are also divided into [Cycle 1 and Cycle 2], and in terms of severity, [Cycle 1] is higher than [Cycle 2].
Suitable for products to be tested: components, equipment, various types of products to be tested
Test environment: high humidity and temperature cyclic changes in combination with condensation can be tested in three environments [use, storage, transportation ([optional with or without packaging])]
Test stress: respiration so that water vapor intrusion
Whether or not the electricity can be energized: can be
Not suitable for: the quality of the parts is too light, too small
The test process and the post-test inspection and observation: checking the electrical changes in the humidity [intermediate checking Not to be taken out]
Test conditions: Humidity: 95% R.H. [Variable temperature after maintaining high humidity] (Low temperature 25±3°C ←→ High temperature 40°C or 55°C)
Rate of temperature rise and fall: Temperature rise (0.14°C/min), temperature fall (0.08～0.16°C/min)
Cycle 1: Occasion where absorption and respiration effects are important features, and where the test specimen is more complex [Humidity not less than 90% R.H.] Cycle 2: Occasion where absorption and respiration effects are important features, and the test specimen is more complex [Humidity not less than 90% R.H.] Cycle 2: Occasion where absorption and respiration are important characteristics, and the test specimen is more complicated [Humidity not less than 90% R.H.]. ]
Cycle 2: Where absorption and respiration effects are less pronounced and the test specimen is simpler [humidity not less than 80% R.H.].
Comparison Table of Differences between IEC60068-2 Damp Heat Test Specifications
Description: For component type parts products, using a combination of test methods to accelerate the confirmation of the test specimen in high temperature, high humidity and low temperature conditions deterioration of the ability to withstand, the test method and in IEC60068-2-30 alternating humidity and heat cycle test, the temperature and humidity test chamber needs to maintain a specific humidity and temperature changes in order to produce respiratory effect to allow moisture penetration into the sample, [condensation, Moisture absorption] caused by product defects are different, the severity of this test than other humidity-heat cycle test level has increased, because the test process has more temperature changes and [respiration], the cycle temperature range is also larger [from 55 ℃ to 65 ℃], the temperature cycle of the temperature rate of change has become faster [heating: 0.14 ℃ / min into 0.38 ℃ / min, 0.08 ℃ / min Become 1.16 ℃ / min], in addition with the general damp heat cycle is different from the addition of a -10 ℃ low-temperature cycle conditions, with the help of temperature and humidity test chamber to accelerate the speed of respiration and let the condensation of water in the gap in the surrogate test product icing is the characteristics of the test specification, the test process allows power and and external loads energized to test, but can not be because of the power to the side of the product after the temperature rise to the impact of the test conditions ( Temperature and humidity fluctuation, temperature rate), due to changes in temperature and humidity during the test process, but the top of the test box can not have condensed water droplets to the side of the product.
Suitable for side products: components, metal assembly sealing, lead end sealing
Test environment: high temperature, high humidity and low temperature conditions combined with accelerated mode
Test stress: accelerated respiration + condensate icing
Whether or not the power can be energized: can be energized with an additional electrical load (can not be due to the power to raise the temperature affects the conditions of the test chamber)
Not applicable: can not be a substitute for humid and alternating humidity and heat, the test is used to produce defects different from the respiratory effect of the test
Test Process and Post-test inspection and observation: Check electrical changes after exposure to moisture [Check under high humidity conditions and remove from the chamber after the test]
Test conditions: Damp heat sub-cycle (25←→65±2℃/93±3%R.H.)←→Low-temperature cycle (25←→65±2℃/93±3%R.H. →-10±2℃)X5cycle=10cycle
Rate of temperature rise and fall: Rise (0.38℃/min), fall (1.16 ℃/min)
Damp heat cycle (25←→65±2℃/93±3%R.H.)
Description: GJB150-09 of the hot and humid test also relies on the temperature and humidity test chamber on the high temperature and high humidity conditions of the precise control, applicable to the hot and humid environment in the storage and use of equipment, prone to high humidity in the environment of the storage or use of equipment, or equipment may be related to the potential problem of hot and humid, the location of the hot and humid will occur in the tropics throughout the year may occur, the mid-latitudes to choose the seasonal occurrences in the equipment that is subjected to the Pressure, temperature and humidity combined changes in equipment can also occur, the specification specifically emphasizes 60 ℃ / 95% R.H. This high temperature and high humidity will not occur in nature, and is not a simulation of solar radiation following the effects of heat and humidity, but can find equipment with potential problems in the area, but can not reproduce the complex temperature and humidity environment, assess the long-term effects, and can not reproduce the humidity effects associated with low-humidity environments.
Humidity Heat Cycle Control Chart
The relative humidity should be maintained at 95% + 5% at all times except during a temperature drop when the relative humidity may drop to 85%.
Note: One cycle is 24 hours.
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