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At this stage, data signals are basically ubiquitous, and all electrical equipment will be surrounded by them. When the mobile phone is not in use, the impact of such surrounded data signals on other electrical equipment is minimal. This is because, when the mobile phone is not in use, there is no data and information communication between the mobile phone and the communication base station, and it is not too much. Sudden changes in data signals may be generated. The electrical equipment is surrounded by a relatively stable magnetic field, that is, a magnetic field of static data. The magnetic field of such static data has almost zero influence on the electrical equipment.

When using a mobile phone, you have the data information exchange between the mobile phone and the communication base station, which will cause any sudden change of data signal, so that a dynamic magnetic field will be generated around the electrical equipment. This kind of dynamic magnetic field data signal will be magnetically induced. Sudden changes in electromagnetic interference can easily lead to neurological disorders of electrical equipment. When the mobile phone is started and the ringing comes, it can cause sufficient kinetic energy to cause spark discharge caused by mild flames, which is likely to cause a fire accident. Refueling oil, chemical plants, safety and other relevant departments have clearly stipulated that the use of mobile phones to make calls at gas stations is strictly prohibited. The current implementation of backpack jammers is not ideal.

The machinery and equipment of the gas station are all controlled by computers. The data signal will endanger the normal operation of the machinery and equipment, and will cause the prohibition of measurement verification. More importantly, the mobile phone will appear flames during the whole process of dialing, which is very easy to cause fire. The accident caused the gas station to explode. Therefore, the gas station belonging to the fire safety center not only prohibits the use of mobile phones inside the website, but also does not need to use mobile phones within two or three meters around the gas station. In addition, gas stations should set up prominent signs prohibiting the use of mobile phones, and increase publicity efforts on the importance of common sense of safety, so that everyone understands the dangers of using mobile phones in gas stations. However, if it is only explicitly prohibited, some people still think it is alarmist and does not follow the rules. In this case, a knapsack blocker acts as the last line of defense against cell phone use at gas stations.

There are several fire accidents caused by the use of mobile phones across the country. A gas station in Henan Province exploded due to the driver's use of a mobile phone when refueling, resulting in a major safety accident that resulted in many casualties. There are also several emergency situations of fire accidents caused by calling mobile phones at gas stations in Shenzhen, Chongqing and other places. The risks arising from the use of mobile phones at gas stations have long been taken seriously by all parties. Relevant departments in Beijing, Hubei Province, Inner Mongolia Autonomous Region, Guangdong Province, Henan Province, Shandong Province, Jiangxi Province, Sichuan, Chongqing and other places have proposed to apply knapsack jammer equipment to gas stations under their jurisdiction. Sinopec Corporation and the headquarters of China National Petroleum Corporation have already applied knapsack GPS Jammer equipment in gas stations in some regions.

The online mobile phone signal shielding system is usually installed in schools, prisons, large conference centers and other places, because these units need to cover a very large area when shielding mobile phone signals, and it will also involve multiple buildings and rooms For the coverage of shielding signals, a large number of shielding equipment terminals will inevitably be required in the way of cellular networking. It is a very common case to install dozens or even hundreds of shielding devices in such a customer unit. The next question arises. After the shielding system is delivered to the customer and put into use normally, how does the network version of the mobile phone signal shielding system fail? What about investigation and analysis?

First of all, the manufacturer of the shielding system will give a standardized guidance document, and will require customers or agents to point out full-time maintenance personnel to regularly check the online version of the mobile phone signal shielding system according to the requirements of the guidance document, and report the inspection results Register and give feedback to the leader in charge of the customer to determine whether further maintenance or replacement is required.