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Cooling Control Temperature Humidity Test Chamber

  High and low temperature damp heat test chamber is the most sold product in the test equipment at present. In the market, the temperature and humidity of this kind of test chamber are constant. Most of them adopt thermal control, that is, the heat of the heater offsets the cold volume of the evaporator to achieve the balance of temperature and humidity.  Cold control is that the controller PID calculates the on-off time of the solenoid valve in a unit cycle according to the actual situation of the equipment, and controls the amount of refrigerant entering the system through the on-off of the solenoid valve. Compared with thermal control mode, cold control mode has obvious advantages in energy saving.   1.Equipment Introduction Next, take the cold control  high and low temperature humidity test chamber  developed by DGBELL. as an example to introduce its equipment technical indicators. 1)    Internal volume: W 600 mm x H 850 mm x D 800 mm; 2) Temperat...
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Integrated Temperature Humidity and Vibration Test

  The reliability of electronic products is affected by many factors. In addition to human operation, the environment in which the products are located is also an important reason for their work failure. Among them, temperature, humidity and vibration are the three main environmental factors that have the greatest impact on the product equipment. This paper analyzes the main types and causes of product failure caused by these three environmental stresses, and discusses the application of temperature, humidity and vibration comprehensive environmental testing technology in product reliability testing.   Environmental stress can lead to the failure of products and equipment, which has been widely recognized by the manufacturing industry. In order to improve the quality of products, relevant technicians and manufacturing enterprises have conducted a detailed study on the relationship between environmental application and product failure.  Environmental tests for product equi...
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Low Temperature Environment Test of Electronic Instruments – Part 2

  3.3 Test Requirements and Methods (1) During the temperature test, the temperature change speed between each temperature step shall not exceed 20 ℃ /h. During the test, the relevant test can be carried out only after the tested instrument reaches the temperature stable state as far as possible. (2) During the high and low temperature storage test of some instruments, the power supply should be disconnected. The power supply shall be kept in the test chamber for at least 4 h. (3) During the relevant temperature test, the temperature in the test chamber shall be kept as uniform and constant as possible. And the temperature difference shall be less than ± 2 ℃. At the same time, the volume of the  test chamber  shall be at least 3 times that of the tested instrument. During this test, relevant measures shall be taken to avoid the influence of humidity on the test. (4) During the temperature test of relevant instruments, it is necessary to carry out the temperature cycle tes...
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Low Temperature Environment Test of Electronic Instruments – Part 1

  At present, electronic instruments are used in military, civil and high-tech fields. However, the low temperature environment exists in most of its service environments. Therefore, the adaptability of electronic instruments at low temperature is directly related to their quality. Based on this, this paper analyzes the low temperature environmental effects and   low temperature test   technology related to electronic instruments in detail.   1.Overview of Low Temperature Environment As a common natural environmental condition, low-temperature environment is often caused by the change of geographical latitude, altitude, season, day and night, and the work of other refrigeration equipment. In the process of developing electronic products, in order to meet the needs of low-temperature storage and work, China is currently planning and building a relatively large-scale low-temperature environment laboratory.  Some existing low-temperature laboratories are also facin...
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Rapid Temperature Change Rate Test Chamber

  A rapid temperature change rate test chamber   is a thermal cycling chamber designed to increase the repeatability of thermal shock testing. Due to the increasing number of issues that affect the reliability of electronic devices, circuit boards, and their reliability, it is necessary to have a better-suited method of evaluating them. Rapid Temperature Change rate Test Chamber stipulates that the test sample temperature variation rate should be less than 15 degrees Celsius per minute. This is the largest difference between thermal shock testing and this method. Rapid temperature change testing produces repeatable results and tests compliance with standards like JEDEC (JESD 22A104B span>).   Features 5~15℃/min temperature change rate. The dry air blowing system protects the surface of the test specimen from drying out during rapid temperature changes. Modular fabrication technique. Smart 32-bit measuring and control system with a colorful screen. Interfaces USB and Et...
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Salt Spray Test and Standards – Part 2

  3.2 Volkswagen Standard PV 1210 PV 1210 is the cyclic  salt spray corrosion  standard for body and accessories of Volkswagen AG, and is the most widely used cyclic corrosion test standard. This standard is applicable to the corrosion detection of coated body, body sheet, structural components and other test samples. The test was divided into three stages: spraying salt spray, standard climate preservation and humid and hot storage. Spray salt spray according to NSS method in DIN 50021 standard, with NaCl mass concentration of (50 ± 5) g/l and spraying time of 4 h; The standard climate shall be kept for 4 h under the condition of 23/50-2 in DIN 50014 standard; The wet and hot storage shall be conducted under the constant state (KK) conditions in DIN 50017 standard (40+3) ℃ and 100% humidity for 16 h. After 5 cycles, it shall be stored in the standard climate for 2 days before continuing. The test can be carried out for 15, 30, 60 or 90 Cycles, and then the corrosion of t...
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Salt Spray Test and Standards – Part 1

  1. Salt Spray Test The corrosion damage of automobile metal parts has become one of the important reasons for the reduction of automobile life. As early as the 1980s, the annual loss caused by automobile corrosion in the United States was as high as 20 billion dollars.  Therefore, both automobile companies and consumers attach great importance to the corrosion of automobile metal parts. Salt spray test is an important means to inspect the corrosion resistance of metal parts. It is usually divided into neutral salt spray (NSS) test, acetate spray (ASS) test, copper accelerated acetate spray (CASS) test, cyclic salt spray test, etc. Neutral salt spray test is to expose the sample to the salt spray box, use the spray device to convert the sodium chloride solution with a mass fraction of about 5% into salt spray, and carry out free settlement, so that the salt spray can fall evenly on the surface of the sample, and accelerate the corrosion of the metal surface by maintaining the...
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