What is SAR? Know the SAR Value of Your Mobile Phones


Normally you must have heard that the mobile phones we use releases a type of radiation which is not good for our health and may cause some serious health issue. These radiations are known as radiofrequency radiation which is a form of electromagnetic radiation. The frequency range of radiofrequency electromagnetic radiation is 30KHz to 300GHz, these ranges are used for telecommunication. Our body absorbs this energy from the devices that emits radiofrequency electromagnetic radiation. This absorbed energy is measured by a term called as SAR.

What is SAR?

SAR stands for Specific Absorption Rate, which is the unit of measurement for the amount of radiofrequency radiation absorbed by human body while using any telecommunication device like smartphone, receiver, transmitter etc. The absorbed radiation (SAR) is expressed in watts per kilogram (W/Kg) of body weight. SAR is usually averaged either over the whole body or over a small sample volume (typically 1g or 10g of tissue).

SAR Testing for Mobile Phones

In SAR testing a mobile phone is placed against the model of human head and body in talk position. To determine the SAR value of a particular model of smartphone, each cell phone is operated at its highest transmitted frequency against the different position of both sides of the dummy head as different users hold the phones in different ways.  After that a series of measurements of the electric field is taken at a specific locations of dummy head in very precise and accurate manner. Only the highest SAR value from the obtained measurements is considered for final authorization.

Various countries have set their SAR limits:

United States: In US, a government organisation FCC (Federal Communications Commissions) regulates all radio communications. FCC sets the limit of SAR 1.6 Watt/kg for mobile phones in its guidelines.
Europe: In Europe, CENELEC specify the SAR limits in European Union countries, following IEC standards. SAR limit in Europe is 2.0Watt/kg for mobile phones.

India

India has switched from European SAR limits to FCC SAR limits in September 2012. Now all mobile handsets are following the FCC guidelines. The mobile handsets which are complaint with 2.0 watt/kg continue to co-exist up to 31 august 2013. From 1st Sept 2013 only the mobile handsets within 1.6watt/kg SAR value would be permitted to manufacture or imported in India.

According to the Dept. of Telecom, India not only rely on the SAR value specified by manufactures but also check the compliance of SAR limits on random basis by the government run Telecommunication Engineering centre (TEC) SAR Laboratory on handsets and 10% of towers.

How to Check SAR Value

To check SAR Value of Your Phone just review the User manual provided by manufacturer or just dial *#07# or visit the manufactures website. So Before buying any smartphones check the SAR Value of the device. 

For example- Some of the models SAR Value in India are given below:

Mobile Set
Head SAR
Body SAR
Mi A1
1.26W/Kg      
0.17W/kg
Apple iPhone XS       
1.18W/Kg
1.19W/Kg
OnePlus 6
1.20W/Kg
0.68W/Kg
Samsung J5
0.306W/Kg
0.594W/Kg
Redmi Note 7S and Pro
0.962W/Kg
0.838W/Kg
What is SAR? Know the SAR Value of Your Mobile Phones What is SAR? Know the SAR Value of Your Mobile Phones Reviewed by on July 22, 2019 Rating: 5

2 comments:

  1. really helpful.. ��

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