Under what conditions is the high and low temperature test chamber tested?

Environmental test, especially the reliability test, the test cycle is long, the object of the test is sometimes a military product of high value, in the process of the test, the test personnel often have to operate or test around the site, so the environmental test equipment must have the characteristics of safe operation, convenient operation, reliable use, long working life, etc., to ensure the normal progress of the test itself. All kinds of protection, alarm measures and safety interlock devices of the test equipment should be perfect and reliable to ensure the safety and reliability of the test personnel, the tested product and the test equipment itself.

In accordance with the latest national standard "GB T10592-2008 Technical Conditions for High and Low Temperature Test Chambers", the high and low temperature test chambers are used as follows:

1. Environmental conditions.

a) Temperature: 15-35;

b) Relative humidity: not more than 85%;

c) Atmospheric pressure: 86 106 kPa;

d) No strong vibrations in the surroundings;

e) No direct sunlight or other direct radiation from heat sources;

f) There is no strong air flow around, when the surrounding air needs to flow strongly, the air flow should not be blown directly on the box;

g) There is no strong electromagnetic field in the surrounding area;

h) There is no high concentration of dust and corrosive substances around.

2. Power supply conditions.

a) Voltage: 380 10%V;

b) Frequency: 50 0) 5hz.

3. Water supply conditions.

Purified or distilled water can be used if the following conditions are met:

a) Water temperature: not higher than 30;

b) Water pressure: 0) 1 0) 3MPa.

4. Load conditions.

a) The test load can be selected from various electrical and electronic products, including the whole machine, components or insulating materials.

b) The total mass of the test load is calculated by placing 50 80 kg of test samples in the chamber volume per cubic meter.

c) The total volume of the test load should not be greater than 1 3 of the studio volume.

d) On any cross-section perpendicular to the prevailing wind direction, the sum of the cross-sectional areas of the test load shall not be greater than 1 3 of the cross-section of the studio at that location.

Commonly used high and low temperature test chamber models

lrhs-101b-l

lrhs-225b-l

lrhs-504b-l

lrhs-800b-l

lrhs-1000b-l

The working environment requirements of the high and low temperature test chamber are mainly for electrical, electronic products, and their original components, and other materials stored and transported in a high temperature and low temperature environment. For identification and factory inspection. The slow use environment of the high and low temperature test chamber has a direct impact on its working efficiency and envy rate. How to improve its work efficiency, I give some suggestions to friends who have used and are ready to buy high and low temperature test chambers for reference:

1. There is no high concentration of dust and corrosive substances around.

2. There should be some space between the equipment and the wall.

3. There should be a certain space between the tested items in the box, between the inner wall of the box and the tested items.

4. Ambient temperature: 15 degrees - 35 degrees.

5. There is no strong vibration around.

6. There is no direct sunlight or direct radiation from other heat sources, which reminds us that the use of the environment is particularly important for its work efficiency. The refrigeration process of the high and low temperature test chamber should be an endothermic process. If the ambient temperature is too high, it will undoubtedly increase the working load of the compressor and greatly reduce its working efficiency.

Of course, the cleaning of the test chamber is also a problem that cannot be ignored, and there are certain tricks!

1.Test procedure of test point: within the adjustable range of the test chamber, select high nominal temperature and low nominal temperature, run the test chamber according to the procedure of low temperature first and then high temperature, the temperature at the center point of the test space reaches the test temperature and remains constant for 2 hours, and the temperature of all test points is tested once per minute within 30 minutes, a total of 30 times;

2.The location of the test point: the upper, middle and lower three horizontal test surfaces are determined in the test space, which are referred to as the upper layer, the middle layer and the lower layer; The distance between the top surface of the upper studio is one-tenth of the height of the studio, the middle level passes through the geometric center of the studio, and the lower level is 10 mm above the sample holder of the lower level; The test points are located on three planes, the central test point is located in the geometric center of the studio, and the distance between the remaining test points on the wall of the studio is one-tenth of the length of their respective sides, but for the test chamber with a studio volume of no more than one meter, Goguryeo is not less than 50 mm;

3.Number of test points: The relationship between the number of test points and the size of the studio volume is:

a.When the studio volume is not more than 2m3, the temperature test points are 9; b.When the studio volume is greater than 2m3, the temperature test points are 15, c

When the studio volume is greater than 50m3, the number of temperature and humidity test points can be appropriately increased;

How to set up the high and low temperature test chamber to test the circuit board, which requires you to provide your test parameters and test methods.

With the development of science and technology, the high and low temperature test chamber is no longer far away from our lives, and many things that are closely related to our lives need to be tested with high and low temperature test chambers. Therefore, the high and low temperature test chamber involves more and more industries, and there are many things to pay attention to when using the high and low temperature test chamber, otherwise it will not only affect the results of the test, but also directly affect the service life of the equipment.

1.Sample placement: The high and low temperature test chamber is circulated by wind, so the sample cannot be too much, and the volume cannot exceed 1 3 with studio space.

If it is exceeded, it may affect the air circulation in the test chamber, which will affect the uniformity of the equipment. Secondly, the test sample should be placed in the middle of the studio, not blocking the air duct above and not directly on the surface of the box.

2.Sample material: high and low temperature test chamber can not measure any flammable, explosive, corrosive substance, if the test sample is water, must be packed in a container, absolutely not spilled.

3.Maintenance: After each use of the high and low temperature test chamber, wipe the chamber with a dry cloth, do not use alcohol, gasoline or other organic solvents, and do not splash water directly on the test chamber.

Once the high and low temperature test enters the water, please stop using it immediately, otherwise there may be leakage, electric shock and other hazards.

In addition, try not to open the door of the high and low temperature test chamber when doing the test. Opening the door at high temperature will cause scalding to the operator, and when doing the low temperature test, it will cause frostbite to the operator, and may also cause the evaporator to freeze, thereby affecting the refrigeration effect.