Waterproof test - Reliability Test

Date：2021-11-05 13:30:00Views：1198

Waterproof test is applicable to electrical and electronic products that may suffer from flushing during transportation, storage or use. Relevant specifications shall specify whether electrical and electronic products must work normally during the test and can withstand flushing conditions and remain intact. In daily life, electronic and electrical products have certain dustproof and waterproof ability. Dustproof test is often used to test the protection ability of electronic and electrical products in micro dust environment. The higher the protection ability, the less damage caused by bad external environmental factors to electronic products. The sealing ability of equipment is very important to ensure the safe operation and service life of equipment. Waterproof test is often used for the operation of electrical and electronic products and materials under flushing conditions. The product may be invaded by external moisture during transportation, storage and use, resulting in damage to the product.

Electronic products may come into contact with moisture during use. If they are not waterproof, the internal parts or circuit boards will be eroded by moisture, and their service life will not be high. In addition, small impurities will also enter the interior of electronic products and affect their normal operation. The waterproof test of electronic products can be carried out by using waterproof testing machine equipment or air tightness tester. Appropriate methods shall be adopted according to whether the products have air holes. For the waterproof test of products with air holes, the negative pressure method, that is, vacuum pumping method, is generally used to check whether the products have leakage; For products without air holes, it is generally necessary to make a tool for sealing the upper and lower closed inner cavity, put the product in, and then use the positive pressure method to check whether the product has leakage.

There are waterproof test requirements for portable, outdoor and automotive electronics, and corresponding test requirements are formulated internationally, whether IEC, mil, ETSI or SAE.

The waterproof test includes the second characteristic number of 1 to 8, that is, the protection grade code is ipx1 to ipx8.

（1）IPX1

Method name: vertical dripping test equipment: see 2.11 for dripping test device and test method. Sample placement: place the sample on the rotating sample table with a speed of 1R / min according to the normal working position of the sample, and the distance from the top of the sample to the dripping port shall not be greater than 200mm. Test conditions: the dripping amount is 10.5 mm / min; Test duration: 10 min;

（2）IPX2

Inclined 15 ° drip test equipment: see 2.11 for drip test device and test method. Sample placement: make one surface of the sample form a 15 ° angle with the vertical line, and the distance from the top of the sample to the drip port shall not be greater than 200mm. After each face, change another face for four times. Test conditions: the dripping amount is 30.5 mm / min; Test duration: 4 × 2.5 min (10 min in total);

（3）IPX3

Water spraying test method: A. pendulum tube water spraying test equipment: pendulum tube water spraying splash test device (see 2.14 of this book for device graphics and test methods) sample placement: select a pendulum tube with appropriate radius, make the height of the sample table at the position of the diameter of the pendulum tube, place the sample on the sample table, make the distance from its top to the sample spray port no more than 200mm, and the sample table does not rotate. Test conditions: the water flow is calculated according to the number of spray holes of the swing pipe, and each hole is 0.07 L / min. When spraying water, the water spray from the water spray hole in the 60 ° arc section on both sides of the midpoint of the swing pipe is sprayed to the sample. The sample is placed at the center of the semicircle of the pendulum tube. The swing tube swings 60 ° on both sides of the vertical line, a total of 120 °. Each swing (2) × 120 °) about 4S. Test time: continuous watering for 10 min. b. Sprinkler type water spraying test equipment: Handheld water spraying and splashing test device. See 2.14 of this book for device graphics and test methods. Sample placement: make the parallel distance from the test top to the spray port of handheld sprinkler between 300mm and 500mm. Test conditions: baffle with balance weight shall be installed during the test, and the water flow is 10 L / min. test time: calculated according to the shell surface area of the tested sample, 1 min per square meter (excluding the installation area), at least 5 min.

（4 ）IPX4

Splash test method: A. pendulum tube splash test equipment and sample placement: the same as paragraph a of IPX3 in article (3) above; Test conditions: except for the following conditions, they are the same as paragraph a of IPX3 in article (3) above; The water spray area is the water spray from the water spray hole in the 90 ° arc section on both sides of the middle point of the pendulum tube to the sample. The sample is placed at the center of the semicircle of the pendulum tube. The swing tube swings 180 ° along both sides of the vertical, about 360 ° in total. Each swing (2) × 360 °) about 12s. Test time: the same as paragraph a of IPX3 in article (3) above (i.e. 10 min). b. Sprinkler splash test equipment and sample placement: the baffle with balance weight installed on the equipment shall be removed, and the rest are the same as paragraph B of IPX3 in article (3) above; Test conditions: except for the following conditions, they are the same as paragraph B of IPX3 in article (3) above; Test time: the same as paragraph B of IPX3 in article (3) above, that is, 1min per square meter (excluding installation area) and at least 5min according to the shell surface area of the tested sample.

（5）IPX5

Water spray test equipment: the inner diameter of the water spray port of the nozzle is 6.3mm; See 2.14 test conditions of this book for the device diagram and its test method: make the distance between the test sample and the spray nozzle 2.5 ~ 3M, and the water flow is 12.5 L / min (750 L / h); Test time: 1min per square meter (excluding installation area) based on the shell surface area of the tested sample, at least 3min.

（6）IPX6

Strong water spray test equipment: the inner diameter of the water spray port of the nozzle is 12.5 mm; See Chapter 2.14 for device graphics and test methods; Test conditions: the distance between the test sample and the water spray port is 2.5 ~ 3M, and the water flow is 100 L / min (6000 L / h); Test time: 1min per square meter (excluding installation area) based on the shell surface area of the tested sample, at least 3min.

（7）IPX7

Short time immersion test equipment: immersion tank.

Test conditions: the size shall be such that the distance from the bottom of the sample to the water surface shall be at least 1m after the sample is put into the immersion tank. The distance from the top of the specimen to the water surface shall be at least 0.15 M. Test time: 30 min.

（8）IPX8

Method name: + continuous diving test++ Test equipment, test conditions and test time: + to be agreed by the supplier and the buyer Its severity shall be higher than ipx7.