The Importance of Temperature Cycling in Product Testing: High And Low Temperature Test Chambers Explained

The temperature and humidity of a high and low temperature test chamber exist in two situations: alternating test chamber and constant test chamber. The control method for a constant high and low temperature test chamber is to set a target temperature first, and the test chamber has the ability to automatically stabilize to the target temperature point.

High and low temperature testing is applicable to the testing of components and materials of electronic and electrical, automotive and motorcycle, aerospace, rubber, plastic, metal and other related products under high and low temperature conditions. It is a type of reliability testing that tests product performance indicators.

High and low temperature cycling tests use temperature test data to evaluate the impact of temperature on sample performance and safety. The effects of high temperature test and low temperature test on samples mainly include the following aspects: material hardening, deformation of parts due to thermal expansion, change of resistance and capacitance function, shortening of product life, loss of viscosity of lubricants, etc.

Structural distribution of high and low temperature test chambers:
The chamber of the high and low temperature test chamber is processed and formed using a CNC machine tool, which has the characteristics of beautiful and elegant appearance, and also uses a simple and non reaction handle. The outer liner of the chamber is made of A3 steel plate treated with spray molding, and the inner liner is made of high-grade imported stainless steel (SUS304) mirror panel. The combination of the inside and outside brings cleanliness to the chamber, making the appearance more textured.

The high and low temperature test chamber uses a large observation window with a lighting lamp for observing the test samples. It utilizes tempered glass embedded in the heating body, which not only maintains a bright space but also allows for real-time observation of the inside conditions. The control circuit inside the equipment is separate from the humidification system to avoid malfunctions caused by water leakage in the humidification pipeline. The circuit system in the water system pipeline of the testing machine can facilitate maintenance and repair.

For the insulation of high and low temperature test chambers, ultrafine glass fiber insulation cotton is used to reduce the loss of excess energy. The chamber also has an automatic water shortage protection device, which is a water replenishing tank in the equipment. The water replenishing tank is located at the bottom right of the control chamber and can also provide convenience for operators to replenish water. Moreover, its testing hole can be used for external testing power or signal lines, with a diameter of 50mm on the left side of the chamber.

How to set the temperature fluctuation in a high and low temperature test chamber:
The alternating test chamber in the high and low temperature test chamber has the ability to set multiple high and low temperature cycles and changes, and can also complete the test process based on pre-set curves. It can accurately control the rate of temperature rise and fall within the range of maximum heating and cooling rates, and can control the rate of temperature rise and fall based on the slope of the set curve. Another type of test chamber also has the same control ability.

The actual temperature fluctuation of the high and low temperature test chamber can be controlled within ± 0.3 ℃. If the equipment wants to more accurately reproduce the actual environmental conditions of the product in the external environment, the factor of temperature uniformity is indispensable. During environmental testing, it is also important to ensure that the surrounding environment of the tested product is under the same temperature conditions,

Therefore, the fluctuation and temperature gradient inside the test chamber must be limited. In the general principles of environmental testing methods, it is clearly stipulated that the temperature of the measurement system for the test sample should be controlled within ± 2 ℃ of the test temperature, and the temperature should not exceed the maximum total value (2.2 ℃) or 1 ℃/m.

Generally, the average cooling rate indicators for both high and low temperatures are based on low temperature, which is generally controlled at around 80 minutes. However, due to the fact that the temperature change rate of the high and low temperature test chamber can be adjusted within the designated time, we must make effective and reasonable choices about its temperature change situation when conducting cooling tests;

Choosing a more suitable temperature change rate can effectively help to verify the effectiveness of the refrigeration results in the experiment. In order to choose a reliable and practical temperature change rate, different methods of temperature change rate in high and low temperature test chambers are used:

1. The average temperature rise and fall rate during the entire experimental process of the high and low temperature test chamber. It is mainly based on the temperature technical parameters provided by the manufacturer of environmental experimental equipment, and then enables temperature cooling in sequence throughout the entire operation process to achieve equipment cooling and ensure an average rate of change in the surrounding environment’s climate warming.

2. The rate of temperature rise and fall during limited travel, in simple terms, is an average rate of five minutes during equipment testing. It mainly ensures that the cooling rate of the studio does not change at the most critical moment when the temperature of the equipment accelerates, and achieves the cooling rate of the studio.

How to control temperature in a high and low temperature test chamber:
The core part of the high and low temperature test chamber is the refrigeration system. The refrigeration system is made of a fully enclosed compressor imported from abroad. The biggest effect of the compressor is that it has two isothermal processes and two adiabatic process;

Under the composition of these processes, the effectiveness of the compressor can be demonstrated. During operation, the compressor will consume a certain amount of work and the temperature will increase. Then, the heat will be dissipated through transmission. This cycle keeps the temperature of the test chamber balanced. The control system can control the output of the heater through a temperature point, thereby ultimately controlling the temperature of the test chamber.

Overall, the high and low temperature test chamber is a turning point, where various classifications of the test chamber can be achieved through “temperature control”, leading to the emergence of diversified temperature control equipment.

Temperature Humidity Chamber | Thermal Chamber | Climate Chamber is according to IEC60068-2-1 (GB/T2423.1) and IEC60068-2-2 (GB/T2423.2), IEC60068-2-78, IEC60598-1, GB/T2423.17, GB/T5170.2, GB/T5170.5. The climate chamber is used to test the CFL/LED which meets IES LM-80-08, electricity products, automative cars, home appications and mobiles.

What is Climate Chamber?

Climate chambers is used to simulate a temperature enviromental condistions, it may also be called environmental chambers or Thermal Chamber or Temperature Chamber. You can click the below videos to learn the details and also how to operate it.

GDJS-015B Temperature Humidity Chamber | Thermal 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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