Research on Application of Temperature Shock Test Chamber in Reliability Testing of LED and Electrical & Electronic Products

Abstract: In the R&D and quality inspection of LED lighting, electrical and electronic products as well as various electronic components, environmental simulation test equipment serves as a core tool to verify the weather resistance and operational stability of products. As a mainstream environmental testing device, the temperature shock test chamber is capable of simulating complex climatic conditions including high and low temperature and alternating humidity and temperature. The LISUN GDJS-015B High-Low Temperature & Humidity Alternating Test Chamber integrates temperature shock and temperature & humidity cycle control functions. It fully complies with IES LM-80-08 and many other domestic and international standards, and can provide a long-term stable test environment for the lumen maintenance testing of LED luminaires and high and low temperature resistance testing of electrical and electronic components. Taking this model as the research object, this paper analyzes its technical advantages, core configurations, application scenarios and standard compliance capability, and expounds its practical value in the reliability testing of industrial products.

High and Low Temperature & Low Pressure Chamber GDJS 

Introduction

With the rapid development of the LED lighting industry and electrical & electronic sector, products are applied in increasingly complex scenarios. Extreme conditions such as outdoor exposure, severe cold, damp condensation and alternating temperature and humidity between day and night will affect the service life and performance of products. Long-term operation of LED luminaires may lead to luminous flux attenuation and chromaticity shift, while electronic components are prone to circuit failure and structural aging caused by temperature and humidity changes. Therefore, the industry requires high-precision environmental test equipment to simulate natural climatic conditions in advance, accelerate product aging tests and verify product reliability.

The temperature shock test chamber realizes wide-range temperature switching and accurate humidity regulation. Different from single-function test equipment, it combines high-low temperature shock and humidity-temperature cycle functions. It can perform rapid alternating temperature shock tests as well as long-term constant temperature and humidity aging tests. As a typical model, LISUN GDJS-015B High-Low Temperature & Humidity Alternating Test Chamber precisely meets the core testing requirements of LED lighting, electrical & electronic products and electronic components. In particular, it satisfies the stringent requirements for lumen maintenance testing of LED light sources, and has become essential equipment for R&D verification, factory quality inspection and compliance certification across the industry.

Core Applications and Standard Compliance

The LISUN GDJS-015B temperature shock test chamber is mainly applied to three major fields: LED lighting, electrical and electronic products, and precision electronic components. It fully meets the requirements of IES LM-80-08, Measurement of Lumen Maintenance of LED Light Sources, which is a key standard for export and energy efficiency certification of LED products. IES LM-80-08 stipulates that LED light sources shall undergo continuous testing for no less than 6000 hours, with stable temperature and humidity throughout the whole process and the temperature tolerance strictly controlled within ±2℃, so as to monitor the attenuation of luminous flux and chromaticity of light sources.

Relying on its stable temperature and humidity control system, this temperature shock test chamber can operate continuously without interruption, which perfectly adapts to long-term lumen maintenance aging tests of LED luminaires. Meanwhile, the equipment is compatible with a series of domestic standards such as GB/T 2423 and GB 7000.1, as well as international standards including IEC 60068, AEC-Q102 and ISO 16750. It can conduct various tests for electrical and electronic products including low temperature test, high temperature test, alternating humidity and temperature test, temperature variation test and climatic load test for automotive electronics, covering full-range testing demands from basic components to complete lamps and whole machines.

Technical Advantages and Hardware Configuration

Wide Temperature Range and High-Precision Temperature & Humidity Control
Wide temperature coverage and high-precision temperature and humidity control are the core strengths of this temperature shock test chamber. The optional temperature range is from -70℃ to 150℃, enabling simulation of extreme working conditions such as polar low temperature and industrial high temperature. The temperature fluctuation is ±0.5℃ and temperature uniformity is ±2℃. The humidity range is 20%~98%RH with humidity deviation maintained at -2%~-3%RH. The high control accuracy of temperature and humidity satisfies the requirements of various high-precision tests. The temperature rise rate is 1.0℃~3.0℃ per minute and the temperature drop rate is 0.7℃~1.0℃ per minute. It supports gradient temperature change and cyclic shock, adapting to temperature shock test requirements of different products.

Imported Core Components for Operational Stability
The equipment is equipped with core components from world-renowned brands. It adopts Vaisala humidity sensors from Finland, which requires little regular maintenance and delivers much higher humidity detection accuracy than traditional wet and dry bulb sensors. PT100 platinum resistance temperature sensors are applied with strong anti-interference performance. The refrigeration system is fitted with original TECUMSEH compressors from France. The fully enclosed air-cooled structure ensures stable operation with a complete global after-sales service system. Independent nichrome electric heaters are adopted for uniform heat generation without local overheating. Combined with self-developed temperature controllers and dual-core PLC control system, closed-loop precise regulation of temperature and humidity is realized.

The inner chamber is made of SUS304 stainless steel, which features corrosion resistance and easy cleaning, suitable for long-term damp and heat tests. High-temperature resistant silicone rubber sealing strips are installed on the door frame to prevent temperature and humidity leakage. The circulating system is equipped with low-noise air conditioning motors with noise level lower than 65dB and multi-blade centrifugal impellers, ensuring even distribution of temperature and humidity inside the chamber and avoiding biased test results caused by local environmental differences.

Multiple Safety Protection and Intelligent Operation
To guarantee safety during long-term tests, this temperature shock test chamber is integrated with multiple protection functions against electric leakage, short circuit, overheating of heating tubes, motor overheating, as well as overpressure, overload and overcurrent of compressors. The equipment will stop running and send out alarms immediately once abnormal conditions occur, protecting both the device and test samples. It supports bilingual operation interface in Chinese and English, and is equipped with USB, RS-232 and RS-485 ports. Users can connect the device to a computer for remote monitoring, program editing and test data traceability, greatly improving the efficiency of test management. The working voltage is three-phase AC 380V±10%, compatible with 50Hz/60Hz power grids for application in different regions.

Summary of Equipment Specifications

The table below lists the core specifications of mainstream models of LISUN GDJS series temperature shock test chamber. GDJS-015B, the research subject of this paper, is applicable for testing medium and large-sized LED luminaires, complete electrical equipment and batches of electronic components.

Conclusion

The LISUN GDJS-015B temperature shock test chamber features wide temperature coverage and high-precision temperature & humidity control, together with imported components and comprehensive safety protection system. It can not only conduct rapid temperature shock tests to assess the thermal expansion and cold contraction resistance of products, but also operate continuously for thousands of hours under constant temperature and humidity, fully meeting the requirements of lumen maintenance tests for LED luminaires in accordance with IES LM-80-08.

In the industries of LED lighting, electrical & electronic products and precision electronic components, this equipment covers the whole testing process including R&D evaluation, production quality inspection and international certification, delivering accurate test data and stable & safe operation. As industrial products impose higher requirements on environmental reliability, temperature shock test chambers represented by GDJS-015B will remain indispensable core equipment for environmental reliability testing, helping the industry upgrade product quality and expand global business.