Q: What is the standard operation and precautions of the TS series thermal shock test machine? The following is the expert authority of the test box manufacturer to answer your questions: In the process of using the thermal shock test chamber, it is necessary to strictly implement the operation precautions of the equipment, and correctly operate the thermal shock test chamber, because many customers do not know how to correct it. Operating the thermal shock test chamber, it affects its service life. Therefore, the engineers from Dongguan Haotian now make an in-depth explanation on this issue based on years of experience: (see figure, thermal shock test chamber) Q: First of all: What is the standard operation of the thermal shock test chamber? Answer: 1. Pretreatment: Place the sample to be tested under normal test atmospheric conditions until the temperature is stable; care should be taken to check the power supply before use and a good grounding wire is required to ensure the safety of the product equipment. For the thermal shock test chamber equipment, some flammable materials and volatile materials should not be put into the test during the test. 2, boot check: Confirm the power cable and ground wire. Whether the external water cooling system is connected properly and the water source is clean. 3. Turn on the power: (Do not wet your hands), the total power supply on the back side of the test box is closed, and the panel is opened. The “Power†button, the controller enters the operation screen, and clicks “Back†in the upper left corner to the function selection screen. 4, initial testing The sample to be tested is compared with the standard requirements, and it can be placed directly into the high and low temperature impact test chamber after meeting the requirements. 5, test and test settings: (see the picture, Figure 1 below, the structure of the thermal shock test box structure, with text description) Thermal shock test box structure schematic picture 1. The test sample should be placed in the test chamber according to the standard requirements, and the temperature inside the test chamber should be raised to the specified point for a certain period of time until the test sample reaches the temperature stability, which is accurate for a long time; (the sample volume occupies the test chamber volume) The space ratio should be <1/3) with a certain gap between the samples. 2. After the high temperature stage is over, the test sample is transferred to the low temperature test chamber adjusted to -55 °C within 5 min, for 1 h or until the test sample reaches temperature stability, whichever is longer. 3. After the end of the low temperature phase, the test sample is transferred to a high temperature test chamber adjusted to 70 ° C within 5 min for 1 h or until the test sample reaches temperature stability, whichever is longer. 4. Repeat the above experimental method to complete three cycle cycles. Settings: Set high temperature pre-temperature - high temperature impact temperature - high temperature impact time - standby open Set the low temperature preheating temperature - low temperature impact temperature - low temperature impact time - standby open Select the number of cycles - impact selection (high temperature / low temperature) - temperature deviation timing 6, recovery After the test sample is taken out of the test chamber, it should be recovered under normal test atmospheric conditions until the test sample reaches temperature stability. 7, after detection Evaluation of test results Q: What are the precautions for the thermal shock test chamber? ã€solved】 Answer: 1. Do not connect the test power supply to the power supply of the equipment, otherwise it will increase the power load of the equipment; 2. It is forbidden to test flammable, explosive, highly corrosive and strong radiation articles; 3. When the thermal shock test chamber is in use, Do not modify the components inside the thermal shock test chamber equipment to prevent some malfunctions and affect the service life of the equipment. Dongguan Haotian reminds you to pay special attention to the cleaning and necessary maintenance in the thermal shock test chamber. 4. Do not carry or repair the equipment while it is powered on or during operation; when checking the maintenance, it is necessary to cut off the power supply to prevent electric shock. The selection basis of the environmental testing equipment for the thermal shock test chamber is actually very simple. The main selection is based on the test specifications and test standards of the engineering products and some principles. The same is true for the thermal shock box equipment. The five principles that need to be followed include repeatability, reproducibility, measurability, exclusivity, and safety. (Reproducibility): A thermal shock box environmental test equipment may be used for multiple tests of the same type of product, and one engineered product may also be tested in different environmental test equipment, being hot and cold The stress levels of the impact box test products (such as thermal stress, vibration stress, electrical stress, etc.) are consistent with the requirements of the same test specification. (measurability); the environmental conditions provided by any environmental thermal shock box test equipment must be observable and controllable. Generally, the accuracy of the parameter test in various test specifications should not be lower than the test conditions. One third of the error. (Exclusive): Every time an environmental or reliability test is carried out, the thermal shock box has strict regulations on the types, magnitudes and tolerances of environmental factors, and excludes the environmental factors required for non-testing to penetrate them for testing. Provide an exact basis for determining and analyzing product failures and failure modes after the end of the test. (Safety and reliability): The various protection, warning measures and safety interlocking devices of the thermal shock box test equipment should be perfect and reliable to ensure the safety and reliability of the test personnel, the tested products and the thermal shock box test equipment itself. Test box. Environmental test equipment must be characterized by safe operation, convenient operation, reliable use and long working life. 5, high temperature scalding cold, thermal shock test chamber during the high temperature test, the temperature inside the box is very high; 6, low temperature burns, cold and hot shock test chamber during the low temperature test, the temperature inside the box is very low; 7, electric shock, do not touch the electrical part when working; 8. Do not open/close the product door by gravity, otherwise the door will fall off. 9. A. Clean the test area of ​​the test chamber before and after each test, and try to keep the test area clean at all times. B. This equipment must be used indoors with a temperature less than +28 degrees. Pay attention to the indoor ventilation. C. Before installation and use, pay attention to the power phase sequence and the power and grounding protection of the equipment. D. This equipment must not be used for testing inflammable and explosive. E, radiator of the refrigeration unit (condenser) It should be maintained regularly and kept clean (for maintenance, refer to the cleaning and care instructions below). F. The left, right and rear sides of the test box are 60cm away from the wall. 9. During the test: A. Do not open the door frequently during operation. When using it, the door should be closed and closed, otherwise the temperature will be leaked. B. Avoid turning the refrigeration unit off and on within three minutes to avoid affecting the function of the compressor. 6. End of the test: A. Disconnect the test box power after the operation stops to prevent leakage. B. Open the box door of the test box. When taking the test sample, do not face the door to avoid being burnt or frostbite. Description of cleaning and maintenance methods inside and outside the thermal shock test chamber: 3. The thermal shock test chamber should be cleaned of internal impurities before operation. 2) When cleaning in the power distribution room at least once a year, you can use the vacuum cleaner to remove the indoor dust. 3) The outside of the cabinet must be cleaned once a year or more. It should be wiped with soapy water first. Cold and thermal shock test box ball test cloth replacement The test cloth must be replaced before the surface of the test cloth is not clean or hardened or after the temperature and humidity control has been continued. The test cloth should be replaced once every three months. When replacing, use a cleaning cloth to wipe the temperature measuring body (Sen-sor). When replacing the new test cloth, it should be cleaned first. The condenser should be regularly maintained monthly, using a vacuum cleaner to remove dust attached to the condenser heat sink or to use high-pressure air to remove dust. Thermal shock test chamber inspection over-temperature protector The setting value of the over-temperature protection during operation of the high and low temperature impact test chamber is increased by 20 ° C ~ 30 ° C. When the temperature in the test chamber rises to the set point of the over-temperature protection, the heater's power supply stops. The "OVERHEAT" over-temperature warning light is on but the fan is still running. If you are running for a long time and unattended operation, be sure to check the over-temperature protector. , is set properly [the wet bulb over-temperature protector is set to 120 ° C]. Inspection and adjustment of wet bulb water level in thermal shock test chamber The water level of the water can not be too high so that the water overflows the water tank or the water is too low to make the wet ball test cloth absorb water abnormally. The accuracy of the wet ball is about six minutes. The water level adjustment of the water reservoir can adjust the level of the water tank. Inspection and maintenance of humidifiers for thermal shock test chambers The water stored in the humidifier should be replaced once a month to ensure that the water is clean and humidified. The water tray should be cleaned once a month to ensure smooth water flow. Operational specifications and precautions for the thermal shock test chamber? Through the introduction of the above-mentioned Haotian engineers, I believe that the user will operate the impact test box correctly. In addition to prolonging the life of the test chamber, the correct operation of the test box can also ensure personal safety! If you have other questions, you can always connect with our Dongguan Haotian engineers!
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Correct operation and precautions for thermal shock tester