When users are just in contact with high and low temperature alternating heat and humidity test chambers, they will first understand the basic parameters of high and low temperature alternating heat and humidity test chamber; usually, the parameters will be marked as "the above data are at ambient temperature (QT) 25 ° C. Studio no load conditions "The above parameters are measured", "The above parameters are all in the empty box condition (except noted), according to GBT5170-2008 for testing" or "The above data is at normal temperature 23 ° C, and measured under no-load conditions" and so on. At this point, you will want to put the sample into the test, the technical parameters will be inaccurate? The answer is definitely no, but if the operation is not correct, it is definitely influential. The specific requirements for sample placement are as follows: 1. According to the principle of environmental test box selection, the volume of the tested product shall not exceed 20% of the effective working space of the high and low temperature alternating heat and humidity test chamber. It is recommended to use no more than 10% for products that generate heat during the test. 2. Place the test sample correctly. The position of the test sample should be more than 10cm away from the wall of the box, and multiple samples should be placed on the same plane as much as possible. The sample should be placed without blocking the air outlet and the return air outlet. The temperature and humidity sensor should also be set a certain distance to ensure the correctness of the test temperature. 3. If the product to be tested is liquid, it must be filled with the container before being placed in the box. It is forbidden to put the test of volatile and explosive flammable liquid. 4. If the product to be tested is a variety of small parts, and the sample racks standard by the manufacturer are mostly perforated, the aperture size is different, and the trays must be used for smaller parts manufacturers. 5. The change of temperature and humidity is affected by the size, amount and heat dissipation of the sample to be tested. The amount of heat dissipation has a certain influence on the cooling rate and the heating rate. Pocket Spring Pillow,Pillow,Pocket Spring Pillow,Hotel Pillow HESHAN HAIMA FURNITURE CO., LTD , https://www.springmattress.com