How to control the temperature uniformity of the environmental test of high power

Posted On：2016-08-04

It is very important to select the appropriate test equipment when the temperature test is carried out.
1, must be required to meet the test range of product failure probability test range, i.e. whether it is extreme temperature conditions of high temperature or low temperature box box or humiture test box or thermal shock test box shall be required to meet the test requirements.
2, must ensure that the volume of the test sample should not be greater than the standard of 1/5 of the working volume of the test equipment to select the test equipment.
3, in order to ensure the uniformity of the temperature in the test area, according to the heating power of the sample, the mode of operation of the test chamber is made. Seth SETH has used hot air natural convection method, especially suitable for dry powder, and most test equipment using hot air forced circulation way. The differences in device temperature distribution has great influence on the test results, when using larger samples, or the number of tests at the same time the sample is large, the test results with different locations and there is a great difference, so we should choose the temperature uniformity of the equipment as much as possible good. Seth SETH temperature and humidity test box, alternating high and low temperature test chamber, temperature and humidity examination box uniform performance is not higher than 0.5 deg.
4, to prevent the test area for thermal radiation or heat load caused by large samples of endothermic or exothermic heating or cooling equipment, the system requirements for the samples in the effect of temperature uniformity and temperature rate during the test.
5, easy to record, display, the cycle test requires the installation of automatic counter, safety protection indicator light, recording equipment and automatic shutdown and other instruments.
6, convenient for sample placement can be required for the placement or suspension of the sample holder, and the sample holder will not change its mechanical properties due to changes in high and low temperature.
7, should have the test power into the device studio in the lead hole.
8, no matter for the damage of the sample and test personnel safety should have protective measures. For example, with the observation window and lighting, with power off phase, water shortage, over temperature protection, operating personnel protection and other alarm devices.
9, whether the need for remote monitoring function.
Attention to the use of simulated environmental test box equipment:
1, when a large sample test, the rise and fall of air flow temperature and humidity will appear deviation, so should carefully consider placing the sample location. Try to be placed in the center of the working space of the test equipment, samples may not contact with each other and overlapping, should be left a certain interval to allow the air to circulate; it should also guarantee test samples are easy to move and test easy to replace samples.
2, check the test area there is no oil and gas and other volatile substances, check the smell of substances, such substances test results must be confirmed in advance.
3 to confirm the test sample under the condition of temperature change.
4, in order to maintain the temperature in the temperature region, as far as possible to ensure that the fluctuation of temperature of test environment and equipment power minimum, to ensure that the test sample does not produce heat radiation does not absorb heat so as to ensure the smooth test temperature.
5, in the test chamber equipment at high temperature or low temperature operation process or test before the end of the test case is strictly prohibited to open the door, to avoid causing the temperature of the test preparation and unnecessary harm to the human body.
6, after the test equipment at the end of the test, quickly remove the test samples will produce unnecessary stress, and may get unexpected results. Therefore, the samples must be cooled to ambient temperature before the sample can be taken out.
6, the installation of test samples and the thermal conductivity of the support frame should be low, to ensure that the test samples and installation and support frame is in a state of insulation.
7, the test content of different products is determined by the test requirements, designers and testing personnel. From the point of view of the test equipment provided by the test, the technical specification of a test equipment is set up. Each can be used to simulate test environment test equipment are generally measurement system. Therefore, the use of off the shelf equipment and buy new environmental test equipment Dudu should focus on from the starting point of the reliability of the test results, precise degree of control and continuous operation of the safety factors.
8, environmental testing is a process that can increase the value of the product, can not be ignored. And temperature environment test as a test environment most basic, applied fields and wide, greatly improving the military and civilian products environmental adaptability and reliability, and directly led to the product quality improvement.
On the temperature stress and the relevant temperature environment test equipment made a simple basis of the introduction, according to the use of accurate selection of the use, in order to achieve the real purpose of environmental testing.