Market surveillance is a process of checking whether products in the market meet the applicable safety requirements and if not, ensure to take the necessary actions to meet those requirements. In the EU there is an own market surveillance authority in each country that ensures effective surveillance of their market.
Specific absorption rate (SAR) is a measure of the rate of radio frequency energy absorption by the body from the source being measured. This article will focus specifically on mobile devices.
Before a device with a radio transmitter is permitted to go on the market for sale, an RF exposure evaluation is required. For devices that are used close to human or animal body this is done by measuring SAR. It is measured at maximum power levels under laboratory conditions. The quantity of SAR is watts per kilogram (W/kg) and it measures the amount of radio frequency radiation absorbed by the body when using a wireless device. To test the device for SAR compliance it is placed in various common talk positions next to the head and body. After that a series of measurements of the electric field are made, which explains how much radio frequency energy is absorbed by the body or head.
Throughout many years there has been several market surveillance tests conducted, which discovered that a part of smart phones in the market exceeded the allowed SAR value.
The French National Frequency Agency (ANFR) conducted retests which are described in a Finnish newspaper in an article published 30th of November 2018. The article can be seen here . ANFR tested the phones in total of 51 phone models. In the EU, the maximum SAR value is 2 W/kg, which according to the tests most of the tested phones were below the limit.
You can read their finding on the official webpage. Several smartphones models had SAR values that were over the regulation limits according to ANFR requirements. Some of these models are also sold in Finland. These models received software updates to lower the radiation to the permissible level allowing the products to remain on the Finnish market. Not all manufacturers were able to take such actions, thus had to be removed from the market until their violation is resolved.
Market surveillance has an important role ensuring that only qualified and regulatory approved products are on the market to provide consumer with the best and safe experience. The market surveillance for mobile phones is done by constant retests of SAR values allowing only the devices that are qualified to be on the market.
Here at Verkotan with more than 15 years of experiences in SAR testing, we can support you throughout the product development life cycle with our extensive expertise to ensure a safe and reliable product. Verkotan is happy to provide more detailed information and make a proposal, how we, at Verkotan can verify your devices in the global environment.
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