Environmental Test Chambers-Reliability Tests
Environmental resistance test:
Temperature cycle test, temperature and humidity resistance test, impact test
Durability test:
High and low temperature preservation test, continuous switch operation test, continuous action test
Temperature cycle:
a. No boot test: 60℃/6 hours ← Rising and cooling for 30 minutes →-10℃/6 hours, 2cycle
b. Boot test: 60℃/4 hours ← Rising and cooling 30 minutes →0℃/6 hours, 2cycle, power supply without packaging and load
Temperature and humidity test:
No power test: 60℃/95%R.H./48 hours
Boot test: 60℃/95%R.H./24 hours/no packaging power supply load
Impact test: impact distance 3m, slope 15 degrees, six sides
Humidity test: 40℃/90%R.H./8 hours ←→25℃/65%R.H./16 hours, 10cycle)
High and low temperature preservation test: 60℃/95%R.H./72 hours →10℃/72 hours
Continuous switch action test:Complete the switch within one second, shut down for at least three seconds, 2000 times, 45℃/80%R.H.
Continuous action test: 40℃/85%R.H./72 hours/power on
Industrial Computer Reliability Test Solutions
Industrial computers can be divided into three categories according to their application attributes:
(1) Board class: includes Single Board Computer (SBC), Embedded board (Embedded Board), Black Plane, PC/104 module.
(2) Subsystem class: includes single-board computers, boards, chassis, power supplies and other peripherals combined into operational subsystems, such as industrial servers and workstations.
(3) System integration solutions: refers to a set of systems developed for a professional field, including the required software and hardware and surrounding, such as automatic teller machines (ATMs). The application of industrial computers widely covers ATM, POS, medical electronic equipment, game machines, gambling equipment, etc. The multi-field industry makes industrial computers must be able to withstand the use of sunlight, high and low temperature, wet and other environments, so the relevant reliability test is the focus of various manufacturers in the research and development test.
Common reliability tests for industrial computers:
Wide temperature test
Wide temperature range: according to the actual application environment can be divided into four categories:
1, Outdoor: especially for the extreme low temperature or high temperature areas, such as northern Europe and desert countries, the temperature range can be from -50 to 70°C.
2, Confined Spaces: for example, where a heat source is generated, such as near a boiler, the high temperature range is about 70°C3. Mobile equipment: such as vehicle equipment, the high temperature can be 90°C4 depending on the car area. Special harsh environment: such as aerospace equipment, oil drilling equipment.
Aging stress test
Aging stress test: The temperature range is from -40°C to 85°C, and the temperature variation rate is 10 °C per minute for cyclic testing
Constant temperature and humidity machine - standard type
The purpose of the machine is to simulate the product under the combined conditions of temperature and humidity in the climate environment (high and low temperature operation & storage, temperature cycle, high temperature and high humidity, low temperature and low humidity, dew test... Etc.), to detect whether the adaptability and characteristics of the product itself have changed. ※ Must meet the requirements of international standards (IEC, JIS, GB, MIL...) To achieve international consistency of measurement procedures (including test procedures, conditions, methods)
Test item: Wide temperature test
Thermal shock machine - stress screening testing machine
Temperature cycling stress screening is the product in the design strength limit, the use of temperature acceleration technology (in the upper and lower extremal temperature of the cycle, the product produces alternating expansion and contraction) to change the external environmental stress, so that the product produces thermal stress and strain, By accelerating the stress to make the potential defects in the product emerge [potential parts material defects, process defects, process defects], in order to avoid the product in the use process, the test of environmental stress sometimes lead to failure, causing unnecessary losses, for improving the product delivery yield and reducing the number of repair has a significant effect, in addition, the stress screen itself is a process stage process. Rather than a reliability test, stress screening is a 100% procedure performed on the product.
Test item: Aging stress test
Cleaning Method of Condenser in Rapid Temperature Change Test Chamber
Rapid temperature change test chamber is a kind of high-precision and high-stability experimental equipment, which can carry out temperature changes in a short time to test the performance changes of materials and products at different temperatures. It is mainly used to detect the performance of products under rapid temperature changes and limit temperature conditions, and is widely used in semiconductor chips, scientific research institutions, quality inspection, new energy, optoelectronic communications, aerospace military industry, automotive industry, LCD display, medical and other science and technology industries.
After handing over the machine to the customer, in addition to instructing the precautions of equipment operation, it will also emphasize the daily maintenance of the equipment. After a long period of operation, Rapid temperature change test chamber should pay special attention to the maintenance of the refrigeration system, because the refrigeration system is not only a complex manufacturing process but also the core of the equipment refrigeration, and the next will focus on understanding the cleaning method of the condenser in the refrigeration unit.
1, Chemical pickling and scaling
For vertical and horizontal shell and tube condensers, the chemical pickling method can be used, and the weakly acidic detergent can be prepared in the pickling tank. After the pickling pump is turned on and run for 24 hours, the pickling pump is turned off, and the circular steel brush is used to brush the tube wall of the condenser back and forth, and the water is washed until all the dirt or rust stains and the scaling solution remain in the tube are clean.
2, Mechanical scaling
First, the refrigerant in the vertical shell and tube condenser is extracted, and all the valves connected to the condenser are closed, and then cooling water is normally supplied to the condenser. Use the bevel gear connected with the flexible shaft pipe washer (the diameter of the hob should be selected to be smaller than the inner diameter of the cooling pipe to scratch the inner wall) in the condenser from the top down rotary rolling mode to remove scale, because the circulating cooling water and the friction of the pipe wall generate heat, can help dirt and rust and other dirt directly washed out of the pool. After the end of descaling, drain the water in the condensate pool, clean up the dirt, and refill the water.
3, Electronic magnetic water scaling
At normal temperature, the electron magnetic water can dissolve calcium, magnesium and other salts in the cooling water of the condenser as positive and negative ions in the water. Electron magnetic water can change its crystallization conditions, can loosen the structure, reduce the tensile and compressive capacity, so that it can not form a hard scale with strong bonding force, and is converted into loose mud with the flow of cooling water and discharged.
The above is the scientific method of cleaning the condenser dirt of rapid temperature change test chamber.
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