Reasons for High and Low Temperature Thermal Shock Chamber Testing of LED Lamps

The High and Low Temperature Thermal Shock Chamber is the main equipment in modern reliability laboratories, used for cold and hot cycling of various materials and environmental stress testing under high and low temperature impacts. The physical changes and material properties of the product after the environmental test of thermal expansion are evaluated through the cold and thermal shock test.

From the perspective of LED product quality, whether it is indoor or outdoor, the environmental climate of LED depends to a certain extent on the LED utilization rate. The High and Low Temperature Thermal Shock Chamber environmental testing equipment can simulate the rapidly changing climate of high and low temperatures in the natural environment. The LED experimental product has been tested under natural environmental simulation, which is undoubtedly an important means to improve the product.

Why should LED lighting be tested using a High and Low Temperature Thermal Shock Chamber?
1. The plastic shell of LED lamps is prone to embrittlement and damage under high and low temperature environmental impact;
2. LED tubes burn out when the temperature changes sharply;
3. LED circuit board chips are prone to short circuits in high and low temperature impact environments.

During the high and low temperature impact test process of qualified LED, after the high and high pressure test, the surface of the lamp cannot peel off paint, discolor, crack, material deformation, and other abnormal phenomena; After the impact test, there is no electrical leakage or abnormal gas phenomenon in the lamp.

In the natural environment, temperature and humidity are two inseparable natural factors. Due to different geographical locations, the temperature and humidity effects generated in different regions also vary. The High and Low Temperature Thermal Shock Chamber is used to confirm the adaptability of products to storage and transportation under temperature, humidity, climate, and environmental conditions.

How to solve the electrostatic problem in High and Low Temperature Thermal Shock Chamber?
1. Suppress the occurrence of static electricity: The source of static electricity is friction and separation between objects, and it must be suppressed as much as possible. For example, in liquid pipeline transportation, dust air transportation, plastic extrusion and other operations, the method is to reduce the speed. In fact, this will affect the operational efficiency, and the safe oil flow rate will not exceed 1m/s. The electrostatic charge or polarity varies depending on the substance.

Therefore, the feasible measure is to avoid the use of insulating materials that are easy to be electrified and materials that are easy to generate static electricity in the cold and hot shock test chamber.

2. Promoting charge leakage: In disaster response, a simpler method is to ground and quickly dissipate charges through metal conductors. But in this way, if the charged body is guided, it is easy to eliminate it, while insulation materials such as plastics, chemical fibers, and petroleum have little effect due to the difficulty in moving the charge of the charged part!

3. Leakage charge of additional conductive substances in objects: including tires. In order to prevent hydrophilic oil in chemical fibers and plastics, metal powder and carbon black are added to the operator’s boots, chemical fibers, and plastics to prevent electrification. Increase the relative humidity in the air, form an absorbent layer on the surface of the object, enhance conductivity, and have almost no electricity at a humidity of over 80%.

So, in areas where electricity may be charged, humidity can be increased by adjusting humidity devices and spraying water. But the problem is that people may feel uncomfortable or have adverse effects on equipment and products.

High and Low Temperature Thermal Shock Chamber can be used in the temperature shock test and fast-changing temperature test in a wide range such as aviation, air space, electronic components and material research.

HLST-500D has two separate chambers: high temperature chamber and low temperature chamber.
HLST-500T has three separate chambers: high temperature chamber, low temperature chamber and test chamber.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

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Tags：HLST-500D