Introduce in detail five common methods for performance testing of tact switches, the specific content is as follows:.
Humidity resistance test method: Put it in a 40±2℃90-95%RH environment for 4 days, then place it in a normal environment, and test after 30 minutes.
Test standard: The contact resistance and insulation resistance are all within the standard range, and there is no sign that the switch performance is damaged.
Cold resistance test method: Place it in a temperature environment of minus 20±3℃ for 4 days, then put it in a normal environment, and test after 30 minutes.
Test standard: The contact resistance and insulation resistance are all within the standard range, and there is no sign that the switch performance is damaged.
High temperature resistance test method: the product is stored for 2-3 minutes under the environment of 280±30℃, and the hand feel and resistance are tested after the heat is dissipated.
Test standards: resistance, gram rebound, shape, etc. The tact switch shows no signs of damage, the performance of the switch is still intact as before, and the soft tact switch is supplied.
Solderability test method: soak the soldering foot into the tin bath about 2mm deep, the test temperature is about 230±5℃, and the holding time is 3±0.5 seconds.
Test standard: more than 80% of the soaked solder feet will be covered by tin.
Solder resistance test method: the temperature of the soldering tin in the soldering furnace is controlled at 260±5℃, and the soldering through the furnace is maintained for 5±1 seconds. When the (substrate) hand soldering, the temperature is controlled at 350±30℃, and the time is 3± 0.5 seconds but no abnormal pressure can be applied to the welding foot.
Test standard: The switch has no deformation and can meet the electrical performance. The result of applying abnormal pressure is invalid.
The use of light touch switches with light is becoming more and more popular, and more and more widely, light touch switches with light have a certain hand feeling, and different strengths can achieve different effects when used, especially the force tolerance range of the use of light touch switches. When I was young, it felt better. The eight advantages of light touch switches with light are the most prominent features of light touch switches with light.
When using a light-tact switch with light, the precision of the shrapnel is also very important. This shrapnel is inside the switch. The function of the shrapnel is to control the light-tap switch with light. If a single shrapnel has a problem, the switch cannot be used normally.
The detection method of the light touch switch with light is very simple. Just touch or press lightly to observe the feeling of freezing and the sensitivity of the response when it is pressed, whether it is a large type light touch switch with light or a small model All of the light-tact switches with light can make people feel simple and easy to operate, and the light-tact switches with light are supplied.
Many materials of the light-tact switch with light have the effect of preventing dust and electricity. They must be carefully maintained during daily use. People can start with the light-tap switch with light, which is an electricity-insulating material, to prevent more light touches. Switches have hidden dangers. When checking the light-tact switches with light in daily maintenance, we should pay attention to whether the light-tact switches have become fragile and deteriorated due to time aging, their sensitivity has decreased, or they have cracked quality problems.
If you find that there is abnormal operation of the light touch switch with light, remember not to disassemble it without authorization. This is a very dangerous practice. There is no professional maintenance environment, and many high-end electrical products need to be carried out in a dust-free environment. Unpacking, because the dust will have a conductive effect, the inspection and maintenance with light touch to open must be carried out in a special environment.
Due to the high sensitivity of the light touch switch with light, you should be careful not to squeeze excessively when you press it, because whether it is a control button on a precision instrument or a simple button on it, the principle is the same. Pressing vigorously or tapping, etc. will reduce the sensitivity of the light touch switch with light.