What is the influence of temperature uniformity of small high and low temperature test chamber
Source: website release time: November 4, 2019 11:05:00 reading: 447
Small high and low temperature test chamber It is widely used for its precise temperature control performance and temperature change rate. It is commonly used in aerospace industry, electronics, electrician, machinery, semiconductor materials, parts and components, etc. in use, it should be noted that some can not be used for the detection of dangerous goods. In use, it must be operated according to the instructions to avoid accidents caused by high or low temperature.
small high and low temperature test chamber can meet the test requirements of most products, and its humidity is in normal humidity state. Environment and reliability test equipment is widely used in testing equipment. Different temperature control range will bring an increase in cost. The larger the required temperature range, the higher the cost. Especially for scientific research and experiment, the heating rate and cooling rate of temperature and the stability of temperature are paid special attention to.
the technical requirement of small high and low temperature test chamber is that the temperature distribution in the whole chamber is uniform. The lower the temperature uniformity is, the higher the accuracy of the test is. If the temperature is not uniform, the test results will be too different from the actual situation, there is no reference significance, so the small high and low temperature test chamber for temperature uniformity requirements is relatively high, generally will be controlled at about 0.01 ℃.
Impact Small high and low temperature test chamber The main factors of temperature uniformity are as follows
The volume of the test sample is too large. If the volume of the test sample is too large, the air circulation in the test chamber will be affected, and the temperature uniformity deviation will be too large. According to the standard, the volume of the test sample should not exceed 1 / 3 of the laboratory space.
2. The test sample is loaded. If the test sample has load, it is necessary to explain the load condition to the manufacturer in advance. Otherwise, it will have great influence on the follow-up test.
3. Position of test samples. If the test sample is not placed correctly, the air convection will be blocked, which will also lead to large temperature deviation. It must not be placed at the air outlet.
4. The tightness of the test chamber is not good.
The structure of the box. Due to the unreasonable structure design of high and low temperature box, the temperature uniformity in the middle of work is affected to a great extent. The better structure should be easy to achieve uniform temperature: heating and cooling should be at the back of the box, with upper supply air and lower return air, forced convection.
the function of small high and low temperature test chamber is to simulate high and low temperature environment, and it is widely used. The performance indexes were tested under the condition of high and low temperature (alternating) cycle change. In order to obtain more real test data, one or more groups of test parameters can be set to cycle or alternately test.