According to Wikipedia's definition: radiation refers to the transmission of energy in the form of waves or subatomic particle motion; Radiation energy radiates linearly in all directions from a radiation source. Radiation can be divided into ionizing radiation and non-ionizing radiation according to its energy level and the ability of ionized substances, in which ionizing radiation refers to rays with short wave length, high frequency and high energy (double forms of particles or waves), such as high-energy particle streams such as alpha rays, beta rays and neutrons, and high-energy electromagnetic waves such as gamma rays and x rays; Non-ionizing radiation refers to electromagnetic waves with longer wavelength than X-rays. Because of its low energy, it can not cause ionization of substances, so it is called non-ionizing radiation, such as electromagnetic waves with weak ionization ability such as near ultraviolet rays, visible light, infrared rays, microwaves and radio waves. The simple understanding is that ionizing radiation is very dangerous because of its high energy. For example, the radiology department (X-ray) of the hospital will have warning signs; Non-ionizing radiation has low energy, such as natural light, so it is relatively safe!
Next, I will introduce electromagnetic radiation, which belongs to non-ionizing radiation. Moreover, any object with a temperature higher than absolute zero can emit electromagnetic radiation. There is no object with a temperature equal to or lower than absolute zero in the world, which means that all objects around people emit electromagnetic radiation all the time. Therefore, it can be said that the wireless router will certainly produce radiation, but it will also produce electromagnetic radiation belonging to non-ionizing radiation, which is very different from the frightening ionizing radiation such as nuclear radiation and X-rays (just like natural light VS nuclear radiation).
I believe that after understanding the difference between electromagnetic radiation and ionizing radiation, everyone has eliminated the "fear" of wireless routers, but the "worry" of many friends is probably still there. Yes, even if electromagnetic radiation is not so dangerous, once it exceeds the standard, it will do harm to human body. So is the electromagnetic radiation of the wireless router "exceeding the standard"? Let's find the answer through the actual test!
LZT-6200 High Frequency Electromagnetic Radiation Tester
Firstly, we introduce our test equipment-LZT-6200 high-frequency electromagnetic radiation tester, which is suitable for high-frequency electromagnetic radiation sources such as mobile phones, wireless routers and microwave ovens. The test accuracy is as high as 0. 1 microwatt/cm2.
Let's talk about the test standards. The frequency bands of mobile phones and wireless routers are concentrated between 30MHz and 30000MHz. According to the public exposure limit stipulated in the current Regulations on Electromagnetic Radiation Protection (GB8702-88), the electromagnetic radiation of such electronic products is below 40 microwatts per square centimeter (μ w/cm ㎡), which is safe. (PS: The EU standard is 450 MW/cm2, and the US standard is 600 MW/cm2, both of which are much higher than China. )
Finally, introduce the test environment:
The electromagnetic radiation in the test environment is about 0.2 μ w/cm ㎡.
We chose the conference room in the corner of ZOL office area. Measured by LZT-6200 high-frequency electromagnetic radiation tester, the electromagnetic radiation here is about 0.2 μ W/cm ㎡, which is a relatively "pure" test environment.
All right, everything is ready. Let's take a look at the radiation test results of the wireless router right away!
Wireless router PK mobile phone who radiates greatly?
Electromagnetic radiation test of wireless router begins.
Test method: Select several mainstream wireless routers (including TP-LINK, D-Link, Netware, Asus, Tengda and other brands. , and show the test results represented by TP-LINK TL-WR84 1N) to participate in this test, mainly to test its electromagnetic radiation in normal working state (energized) and full-load working state. During the test, LZT-6200,
Why do you choose to test near the fuselage?
Before we started to conduct electromagnetic radiation on each wireless router, we expected that the electromagnetic radiation value at the top of the antenna or around the antenna should be the highest, but through many practical tests, we found that the result was the highest when we tested near the fuselage. Therefore, in order to show the "extreme" test results, we choose a test method close to the wireless router itself.
Electromagnetic radiation test results of mainstream wireless routers under normal working conditions: (PS: wireless routers have no so-called "standby" state)
Test result of TP-LINK TL-WR84 1N: 20. 1μW/cm2.
Through the actual test of several mainstream wireless routers, the test results of electromagnetic radiation under normal working conditions are between 17-25(μW/cm2), and the test results of TP-LINK TL-WR84 1N, which is the absolute representative of mainstream wireless routers, are 20. 1 microwatt /cm2.
Electromagnetic radiation test of mainstream wireless routers under full load
Firstly, how to make the wireless router work at full capacity is introduced. We connect two notebooks to the wireless router by wired and wireless means (taking TP-LINK TL-WR84 1N as an example), and then use NetIQ chariot software to simulate 20 pairs of downlink+uplink data transmission, which is basically at full capacity for mainstream wireless routers.
Test results:
Test result of TP-LINK TL-WR84 1N: 27.4μW/cm2.
Through the actual test of several mainstream wireless routers, the electromagnetic radiation test results are all between 24-3 1(μW/cm2) under full load, and the test result of TP-LINK TL-WR84 1N, which is the absolute representative of mainstream wireless routers, is 27.4 microwatts /cm2.
Through the actual test of the mainstream wireless router, it is not difficult to see that even if it is close to the wireless router, its electromagnetic radiation test results are obviously lower than the China standard (40μW/cm2), and even far lower than the European and American standards. Therefore, it can be said that users do not need to worry about the electromagnetic radiation of wireless routers, and can use them with confidence.
Talking to mobile phone PK makes you feel more at ease.
Perhaps just looking at the digital test results can't completely reassure some wireless users, so we can make a more intuitive feeling by comparing the measured electromagnetic radiation of mobile phones.
Test method: We selected an Apple smartphone and a Samsung smartphone to participate in this test, mainly to test their electromagnetic radiation during standby and call. During the test, LZT-6200 high-frequency electromagnetic radiation tester will also be tested near the mobile phone body.
Test results of electromagnetic radiation in standby state of mobile phone;
Apple mobile phone test result: 17. 1μW/cm2 Samsung mobile phone test result: 25.4μW/cm2.
Through the actual test of two mainstream smart phones, their electromagnetic radiation test results in standby state are 17. 1μW/cm2 and 25.4μW/cm2 respectively, which are very close to the test results of mainstream wireless routers in normal working state and full-load working state. Let's look at the electromagnetic radiation performance of the mobile phone during the call.
Test results of electromagnetic radiation of mobile phone during call:
Apple mobile phone test result: 93. 1μW/cm2 Samsung mobile phone test result: 93.3μW/cm2.
Through the actual test of two mainstream smart phones, the electromagnetic radiation test results are 93. 1μW/cm2 and 93.3μW/cm2 respectively, which are much higher than the test results of mainstream wireless routers in normal working state and full-load working state.
Compared with the test results of electromagnetic radiation of mobile phones, I believe that many users' hearts have fallen to the ground-mobile phones are often carried close to the body, while wireless routers are hardly used close to the body, but the electromagnetic radiation generated by mobile phones in standby state is similar to that generated by wireless routers in normal working state or even full-load working state, so as long as you are a mobile phone user, you don't need to worry about the electromagnetic radiation of wireless routers at all!
Isn't the "wall-penetrating" wireless router terrible?
Just now, we have passed the actual test and proved that the electromagnetic radiation generated by mainstream wireless routers is lower than the national standard (far lower than the European and American standards) and is safe. So are those "through-the-wall" wireless routers on the market safe? Let's pass the test together!
First of all, let's introduce the secret of "through the wall" wireless router. In fact, the so-called "through-the-wall" ability is not only optimized by some wireless and antenna technologies (such as ASUS signal amplification and directional technology), but also depends on the transmission (transmission) power of the wireless router, that is, its size largely determines the "through-the-wall" ability of the wireless router. This is the so-called "through-the-wall mode" and "one-button promotion of wall-penetrating ability" The Secret Behind.
So, can users continuously improve the transmitting power of wireless routers to increase the wall penetration ability of wireless routers? Unfortunately, as long as you buy a regular brand licensed wireless router sold in China market, its maximum wireless transmission power in the 2.4GHz band will be limited to 100mW, that is, those so-called "through-the-wall mode", "one-button through-the-wall capability" and so on. No matter what it is called, its final transmission power will not exceed 100mW, otherwise it will not be sold! (PS: If the user refreshes the wireless router to the third-party firmware, the wireless transmission power option is usually not limited to 100mW).
To sum up, in order to make the test more convincing, we didn't find some wireless routers with "through-the-wall" ability to test, but chose a wireless router with wireless transmission power adjustment ability (ASUS RT-N66U) for actual measurement to see if the electromagnetic radiation of the wireless router will exceed the standard in "through-the-wall" mode.
Test method: The transmission power of ASUS RT-N66U wireless router is 80mW by default, and we adjust it to 100mW (which is considered as the through-wall mode) and 50mW respectively during the test to see how much the transmission power affects the electromagnetic radiation. (PS: ASUS RT-N66U wireless router was in full load working state during the test)
The transmission (transmission) power is adjusted to 100mW, that is, the "through-wall" mode is started.
Test results when the transmission power is 100mW:
Test results: 30.6 microwatts/cm2.
After adjusting the transmission power of ASUS RT-N66U wireless router to 100mW, its electromagnetic radiation test result is 30.6μW/cm2, which is a certain improvement compared with our previous test result in the default state (full load test result is 28μW/cm2).
Let's adjust the transmission power of ASUS RT-N66U wireless router to 50mW.
The transmission (transmission) power is adjusted to 50mW.
Test results at 50mW transmission power:
Test results: 22.5 microwatts/cm2.
After the transmission power of ASUS RT-N66U wireless router is adjusted to 50mW, its electromagnetic radiation test result is also reduced to 22.5μW/cm2, which is obviously lower than 100mW.
Through the actual measurement of the wireless router with adjustable transmission power, it is not difficult to see that the transmission power does determine the electromagnetic radiation of the wireless router, but as long as its power is not greater than 100mW, it is safe for users. In other words, as long as the user buys a regular brand licensed wireless router sold in China market, even a wall-penetrating wireless router can be used with confidence and peace of mind. (PS: If the coverage of the wireless router in the user's home has reached the neighbor's home, properly reducing the transmission power can not only reduce electromagnetic radiation, but also make your home wireless network more secure! )
Our little suggestion:
At present, some brands of wireless routers on the market have the function of wireless transmission (transmission) power adjustment, but for those wireless routers that do not have this ability, some users will choose to refresh the firmware of third parties to make them have the ability to "go through the wall". However, the third-party firmware has no strict restrictions on power adjustment (because the global standards are different), so for health reasons, it is strongly recommended that you do not adjust the transmission power of the wireless router above 100mW.
So if it exceeds 100mW, what kind of electromagnetic radiation will it produce? Next, we will test a high-power wireless network card (rubbing network card) that exceeds the standard to speed up your answer.
Test result of electromagnetic radiation of network card: 100μW/cm2.
The test results show that the electromagnetic radiation of the over-standard high-power wireless network card (friction network card) is as high as1000 mv. If users use this product for a long time, it may be harmful to their health. Therefore, it is recommended that you do not choose the so-called rubbing network card and stay away from such products. In addition, for some parallel wireless routers, or some irregular brand wireless routers that claim to achieve wide wireless coverage, I suggest that you don't buy them easily!
PS: According to the experimental results of preventive medicine experts at home and abroad, when high-frequency electromagnetic radiation exceeds the national standard limit, it will cause nervous and mental disorders, such as nervousness, insomnia, head swelling, headache, general weakness and so on. Excessive electromagnetic radiation will damage human brain, destroy endocrine function and affect human fertility.
Distance makes beauty! It is healthier to stay away from wireless routers.
In the previous electromagnetic radiation test, we always put the tester close to the wireless router for testing, but I believe most users will keep a certain distance from it when using the wireless router. So, will the distance reduce electromagnetic radiation? Next, we will verify it through actual measurement!
Test method: In order to make the test results have a better comparison effect, we continue to choose the tested TP-LINK TL-WR84 1N and ASUS RT-N66U wireless routers to participate in this test. During the test, the linear distance between the tester and the wireless router is about1m.
Test results when the tester is close to TP-LINK TL-WR84 1N:
Test results: 27.4 microwatts/cm2.
Test results of the tester at the distance of TP-linktl-wr841n1m:
Test results: 4.5 microwatts/cm2.
By comparing the test results, we can easily see that the distance of 1 m reduces the electromagnetic radiation from 27.4μW/cm2 to 4.5μW/cm2, which is quite obvious.
Test results when the tester is close to ASUS RT-N66U;
Test results: 30.6 microwatts/cm2.
Test results when the tester is away from ASUS RT-n66u 1 m:
Test results: 6.8 microwatts/cm2.
The test results are as we expected. The distance of 1 m reduces the electromagnetic radiation of ASUS RT-N66U from 30.6μW/cm2 to 6.8μW/cm2, which is also quite obvious.
In order to further verify the ability of distance to reduce the electromagnetic radiation of wireless router, we moved the tester to a position 2 meters away from ASUS RT-N66U. What will be the electromagnetic radiation at this time? Take a look at the test results immediately:
Test result: 0.8μW/cm2.
To be honest, this test result is somewhat unexpected. The electromagnetic radiation of ASUS RT-N66U has dropped to 0.8μW/cm2, which is only one fiftieth of the national standard!
Through the above tests, we can easily see that the effect of "distance" on weakening electromagnetic radiation is obvious. Therefore, we suggest that when using wireless routers, we should try our best to keep a straight distance of more than 1 meter, because distance can not only produce beauty, but also bring peace of mind and health. In addition, it is suggested that if possible, the wireless router can be installed on the wall or roof, which can not only shorten the distance between you and it, reduce electromagnetic radiation, but also obtain better wireless coverage.
Summary: The radiation of wireless router is not terrible!
In this test of electromagnetic radiation of wireless routers, the test results of each wireless router participating in the test did not exceed the national standard (40μW/cm2), and were far lower than the European and American standards, indicating that the radiation of wireless routers is not terrible, and users do not need to worry about the electromagnetic radiation generated by wireless routers, so they can use it with peace of mind. Of course, the premise is that you buy a regular brand licensed wireless router sold in China market.
Although users no longer need to worry about the electromagnetic radiation generated by wireless routers, there are still some small details worthy of attention when using wireless routers in order to better avoid the invasion of electromagnetic radiation!
Let's summarize it for everyone:
1. Do not put wireless devices such as wireless routers and household appliances (Bluetooth mouse, wireless headset, cordless phone, etc. ) together (or stacked together) to avoid the accumulation of electromagnetic radiation and mutual interference between radios.
2. Don't put the wireless router on the bed. It is recommended to keep a distance above 1 meter. When you have a rest at night, I suggest you turn off the wireless router, which is not only environmentally friendly (wireless routers consume a lot of power! ), but also for health.
3. Don't blindly adjust the wireless transmission (transmission) power, and stay away from irregular brand wireless products and high-power wireless products.
4. It is suggested to install the wireless router on the wall or roof, which can not only expand the distance between them and reduce electromagnetic radiation, but also obtain better wireless coverage effect.
5. Set the wireless password and the administrator password, because once your wireless network is controlled by the "surfer", in order to improve the use effect (expand the wireless coverage), he usually increases the transmission power of your wireless router (even by refreshing the firmware to break through the power limit), and the electromagnetic radiation of your home will naturally increase. In this way, not only your data information is dangerous, but also your health will be affected.
Well, as long as you do the above, I believe your wireless network life will become greener, healthier and more exciting!