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Use of high and low temperature cold and hot impact test cha

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 Article From:www.hongyu-group.netEDIT:hongyuTIME:2018-09-12 17:27

1. The high and low temperature cold and hot impact test chamber is an indispensable instrument for testing product quality
High and low temperature impact test chamber, also known as cold and hot impact test chamber, provides environmental simulation test of cold and hot alternating impact mode for static test items.Widely used for testing electronic components, semiconductor, electronic circuit board, metal chemistry, materials and other industries.The lower part of the test chamber is the low-temperature storage area, and the upper part is the high-temperature storage area. The specimen (to be measured) is placed in the middle of the test chamber. When the high-temperature impact occurs, the upper damper is opened to form a high-temperature internal circulation.The upper damper is closed and the lower damper is opened to form a low temperature internal circulation.
The biggest characteristic of high and low temperature impact test box is that the test piece (to be measured) is still, which avoids the inconvenience caused by time movement.
2. How to choose the high-low temperature impact test chamber correctly
When purchasing high-low temperature impact test box, there are three main aspects in terms of equipment performance indicators besides their own requirements:
First, temperature and humidity deviation.That is, the difference between the measured maximum value and the measured minimum value and the nominal value in the working space under the stable state of the environmental testing equipment.
Second, temperature and humidity fluctuation.That is, the variation of the parameters of the center point of the working space with time in the stable state of the environmental test equipment.
Thirdly, homogeneity of temperature and humidity.That is, the difference between test points in the working space at a certain time when the environmental testing equipment is in a stable state.
3. How to use the high and low temperature cold and hot impact test box
High and low temperature impact test box in the process of use, due to improper operation and other reasons, resulting in equipment overload and reduce the service life or some functions idle waste.So how to avoid these problems?
First, choose the test equipment reasonably.This should choose the temperature range and effective volume of high and low temperature impact test box reasonably according to different conditions of test products.
The commonly used test temperature of test products should be considered when selecting the temperature range, and the limit temperature should set aside an appropriate margin on the basis of the commonly used temperature. If the limit temperature is often used for long tests, the equipment cannot be satisfied.
A reasonable proportion should be maintained between the test sample and the effective volume of the test box considering the volume of the equipment.For hot test samples, the volume shall not be more than one-tenth of the effective volume of the test box.For non-heating test samples, the volume shall not be more than one-third of the effective volume of the test box.
Second, operate the equipment correctly.When using the device, to be familiar with the required test sample performance, test conditions, test procedures and test technique, to the structure of the high and low temperature impact test chamber to understand somewhat, be familiar with the operation and performance of the controller, read the instructions carefully, standardized operation, avoid the error caused by the test equipment can't normal operation that cause damage to the test samples, test data is not accurate.
Third, place the test sample correctly.The placement of the test sample should be more than 10cm above the wall of the high-low temperature impact test box, and multiple samples should be placed on the same plane as far as possible.Sample placement should not block the air outlet and return air port, and leave a certain distance for the temperature sensor, so as to ensure the accuracy of test temperature.
About the acquisitive into
Dongguan hongjin testing instrument co., LTD. Is a high-tech enterprise integrating research, development, production, sales and after-sales service, focusing on the constant temperature and humidity test box, programmable high and low temperature test box, drying box, culture box, salt spray corrosion test box, constant temperature tank and other equipment.



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