Testing Chambers Knowledge

  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...

  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...

  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...

  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...

  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...

  Temperature Humidity Chamber   simulates a variety of temperatures and humidity conditions to test various products and components. It can perform basic thermal cycling tests or accelerated stress testing. There are 6 models to choose from and test cabinets ranging in size from 80L up to 1000L. Customized sizes are also available. Imported temperature controllers regulate temperature and humidity in the temperature humidity test chambers. You can set many parameters with programmable controllers. A digital display of temperature and humidity is available. The operation of the constant-temperature test chamber is also easy. An industrial programmable controller controls the equipment and accurately measures the temperature and humidity. It adjusts the humidity level in the chamber and processes the data to produce the printed results. It can measure humidity continuously and repeatedly with high accuracy and control. It can be used for product testing in scientific research u...