SAR tests in the laboratory and human exposure occurs at radio frequency

SAR tests in the laboratory and human exposure occurs at radio frequency

The wireless handheld devices are now part of our daily habits and have almost become an extension of ourselves.
Frequently we use the smartphone and carry it in his pocket, or we the smartwatch the wrist and do not think that we are exposing our body parts, and hold, to electromagnetic fields generated by these objects that are always connected to some communication network.
The broadcasting apparatus usable in close contact with the body must be subjected to specific tests before being put on the market: the assessment of’human exposure to electromagnetic fields and the so-called SAR measurement.

What is the SAR?

The SAR, stands for Specific Absorption Rate It is defined as the amount of EM energy absorbed by human body tissues on unit mass and is measured in W / Kg.
The SAR testing, then, measure the percentage of electromagnetic energy absorbed by the human body when this is located in the vicinity of a magnetic field radiofrequency. The values ​​thus obtained make it possible to verify that they comply with the limits of safe exposure to electromagnetic fields.

Following the guidelines defined by 'International Committee for Non-Ionising Radiation Protection (ICNIRP), the European Union, the United States, it Canada, Japan, Australia and other, approved standards, which determine the maximum emission levels permitted to contain within certain safety thresholds tolerance absorption.
By incorporating these provisions, in the allowable SAR value of the EU is 2 W / Kg su 10 grams of tissue. The US and Canada regulations impose stricter parameters, by fixing the limit at 1,6 W / Kg misurati su 1 gram of tissue.

The SAR testing in laboratories Sicom Testing

SAR measurement system Sicom Testing It performs the SAR measurement of electrical equipment, electronic and telecommunication can be used in the vicinity of the body.
This workshop is specially equipped for measuring the specific absorption rate of electromagnetic energy by the human tissue when exposed to EMC fields.
The equipment available to Sicom Testing allow you to perform SAR measurements of small objects, such as portable phones, or larger devices.
All measurements can be applied to various sensitive parts of the human body such as the head, the abdomen or wrist.

The SAR measurement is carried out using a machine made by a robotic arm, by an electric field probe and from special tanks, the shape of which reproduces the model and of the head of the human body. Inside the tanks it is contained a special liquid that allows to simulate the characteristics of human tissue.
The device on which tests are carried out is then positioned at the bottom of the tanks so as to simulate the use in the vicinity of the head or body. The measurement is carried out by means of a complex test procedure, at the end of which the value obtained by the measures is compared with the limits laid down by the regulations rifermento.

Sicom Testing: experience, expertise and continuous innovation

Thermography of the head The lab Sicom Testing dedicated to this type of test and measurement, and realized thanks to the collaboration of the Research Area Science Park and Friuli Venezia Giulia, from the 2006 It is unique in the area and established itself nationally recognized for its expertise in the field of checks on’human exposure.
In this compound Sicom Testing He has developed proven expertise in measuring techniques, calculation and simulation for SAR measurement, verifying the conformity of various devices to the various existing standards.

The continuous evolution of the reference standard is accompanied by a constant work of renovation, focused on skills and training of personnel as well as on laboratory instrumentation.

Sicom Testing It offers a complete service for the risk assessment of human exposure to electromagnetic fields and SAR measurement of your products.

To request more information on this topic, write to info@sicomtesting.com
or call +39 0481 778931.

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86 thoughts on “SAR tests in the laboratory and human exposure occurs at radio frequency”

    • Good morning Yitzac,
      the SAR value is expressed in units of watts per kilogram (W / kg) and the manufacturer shall indicate in the user manual.
      Kind regards
      Staff Sicom

    • Good evening,
      I would like to kindly have a little information below:
      – what kind of liquid is used in the test tanks and in what sense it allows to simulate the characteristics of human tissue?
      – the value of 2 W/kg per 10g, how it relates to the other radio transmission threshold imposed (at the moment) a 6V/m?
      – remember that about the SAR parameter, there was talk of thermal related effects (in fact, you reported a color image of thermography) to raise the temperature on the skin interface in contact with a mobile phone. But there are also studies on the possible interrelation with the cells of the deeper layers and not only at a thermal level?
      I imagine that your systems also allow you to calculate SAR and effects generated by other devices in the microwave range (ovens etc.), am I right ?
      Thank you very much and see you soon

      • Good morning,
        – the liquid used in the test tanks simulates human tissue having the same transmission and absorption properties as the electromagnetic field;
        – the value of 2W / Kg for 10 g does not directly relate to the environmental limit of 6V / m;
        – some medical studies state that a temperature rise above 1 ° C is not negligible. However when the SAR measurement techniques were defined, the experts preferred a method based on the measurement of the electric field because it was more reliable and precise. Currently, human exposure to electromagnetic fields must be assessed for all electrical and electronic systems. The applied technique and the laboratory measurements to be carried out depend on how the equipment is used.
        In the specific case of the microwave oven, the SAR measurement is not applied.
        Greetings from Sicom Testing

        • Good evening,
          when choosing a terminal, which measurement scale is more rigid or more reliable the American or the European one?
          Thank you

          • Good morning,
            Limits and various measurement parameters differ between American and European standards, therefore it is not possible to make a direct comparison between the measures that is valid for each terminal. In any case if you want to place a product on the European market, this will have to be evaluated according to European standards, if it is to be placed on the American market it will have to be evaluated according to American standards.
            Sicom Test

  1. The SAR of a person can be "X", Due to non-ionizing radiation emissions a mobile Base Station ? In short, is a person can learn how to absorb the radiation from an antenna?

    • Hello Cristian,
      thanks for contacting us.
      The SAR measurement and evaluation of human exposure to electromagnetic fields in general have precisely the purpose of determining how much radiation absorbs the human body exposed to a specific electromagnetic field source, for example mobile phone or base station.
      Normally, the SAR value is obtained by performing the tests on a radio device in a laboratory. In the case of a base station, the evidence relating to human exposure that can be made are those of the electric fields.
      Kind regards
      Staff Sicom

    • Good afternoon. What is the difference between head and body SAR? Because the coefficients are different on a phone: for the head-0,3, for the body-1.38?

      • Good morning.
        The SAR of the head assesses human exposure when the product is used placed on the ear, as happens in traditional telephony.
        The body's SAR assesses human exposure when the product is used close to the body, for example attached to the belt, held in your pocket or in your hand.
        There are some technical differences in the two measures. For the head SAR, only one side of the product is typically facing the head, while for the body SAR the test is typically repeated on all sides of the product. The latter can be one of the causes of the difference in values ​​that are obtained.
        Greetings from Sicom Testing

  2. Salve. I lived in 60 meters from a cellphone tower 21 years. What test would show whether a human or a dog could suffer the effects of that RF radiation?

    • Hello Shelley Ellis, thanks for contacting us. It can carry out field environmental testing to verify that the RF radiation fall within the limits provided by the regulations. Usually these tests are performed by specialized technical team to produce appropriate instrumentation.
      Kind regards
      Staff Sicom

  3. Good afternoon, I want to know if the SAR of a terminal lowers wearing warm clothes (I refer to the SAR in the body). Thank you

    • Hello Natalia, thanks for contacting us. It's’ possible that the SAR level of a device is lowered if you wear clothing. In general, the SAR value depends on the distance that exists between the body and the radio-transmitting device.
      Kind regards
      Staff Sicom

      • Good morning,
        it is not clear to me how often the SAR data of head and body phones can be very discrepant. Lately, for example, I bought a phone with a very low head sar (0,27 w/kg) but the sar body is not the best (1,39 w/kg). I would expect that, if a device has a low sar placed near the head, behave in the same way for the body. It can also be said that the sar head parameter is more important from the point of view of risk than sar body? Thanks for your attention.

        • Good morning,
          There are technical differences in the SAR measurement methods between head and body, furthermore, the position of the device in the head tests is that typical of the telephone during a call, in this case the antenna is, usually, farther away because it is at the back of the phone and most of the power is emitted in the opposite direction from the head; in the measures for the body the measures are repeated with all and 6 the faces facing the body and is considered the highest value. Which of the two is the most important parameter depends on the use made of a device.
          Kind regards
          Sicom Test

  4. The SAR value is the energy generated by RF fields ? so 1.73 w / kg emitting X phone is the heat energy generated by the body RF absorbed?

    • Good morning Edgar, thanks for contacting us.
      The SAR value expresses the measure of the percentage of electromagnetic energy absorbed by the human body when it is exposed to the action of an electromagnetic field at radio frequency. The value 1.73 W / Kg refers to the amount of energy absorbed by the body of unit mass.
      Staff Sicom

    • Good morning. I have a question. On the basis of the measurement of the criteria will be of the same smartphone, the corresponding value USA should not always be greater than EU?

      • Yup, typically it is so, However, the transmission bands are different in the two countries, so there may be unexpected results.
        Sicom Testing

        • Good morning,
          For 5G the measurement of SAR takes place in the same way as for other devices that transmit radio waves, and the same limits must be respected (independent of the technology used).

          Kind regards
          Sicom Test

    • Hello if I use my mobile phone only with wi-fi and turn on airplane mode, the SAR value will be much lower, if I used it with data

      • Good morning.
        Airplane mode does not guarantee that all wireless functions will be disabled. However, the electrosmog produced by the mobile phone, tablet or other instruments in this operating regime is very small and the consequent exposure to electromagnetic waves is to be considered negligible.
        Greetings from Sicom Testing

    • Dear Joseph,
      according to the European standard of the SAR value it is expressed as an average value of a corresponding cube 10 g of tissue. The cube (ideal) It is placed in the maximum exposure area. The SAR is expressed in watts of power per kilogram of tissue.
      According to the US standard value is expressed on a cube only 1 g of tissue. The thus measured value is greater than the European because the media is made on a volume that is a subset of the European and which contains the maximum peak exposure.
      good job
      Sicom Testing

  5. Good morning. The values ​​will be of the cellular usually refers to exposure of the head (ear) the person during the call. I do not find correspondence, in the tables that I find on the net, between these values ​​and those referring instead to exposure of the body. This last, on average, They are much higher than the first. How it is measured? Change something in the detection system? Thank you

    • The SAR measurement relative to the body is carried out on all sides of the product comparing it to a flat surface. The measurement of SAR relative to the head is carried out by combining the product to a head-shaped surface turning the speaker toward the ear.
      It is obtained a SAR measurement relative to the upper body to that of the head if the emission occurs mainly towards the back of the phone and if the antenna is placed so as not to approach the cheek during use close to the ear.
      Sicom Testing

  6. In a typical double bed, I inadvertently left my Samsung Galaxy Note 4 access (even with the WiFi home to which your phone is connected) on my side (where I sleep) while my wife was resting in the afternoon, x a time of 3 / 4 hours.
    The distance between my sleeping wife and your smartphone resting on the bed was between 70 and 90 cm.
    (I was standing in another room, otherwise I would have immediately removed the phone, but I forgot to have it resting there and my wife saw him because randomly covered by the sheet).
    The question is: as they affect the SAR values ​​on the body at similar distances? And the WiFi to which the phone as it affects SAR value was attached?
    Thank you.

    • The SAR value decreases rapidly with increasing distance from the body. In just a few centimeters make a big difference. At distances She indicates exposure is negligible.

      Good day from Sicom Testing

      • Hi, I'm looking smartphone models taking into account low Sar. I do not know if priority is lower in relation to the head or to the body. So says the body we take advantage of the distance we, but if my use of the phone is as minority calls and auriculares..No I use is more convenient than the sar is low in the body especially?

        • Good morning Anna,
          generally low SAR values ​​are equivalent to greater safety. I carried out in the laboratory tests are performed on the devices operating at maximum power and the results are the maximum values ​​found in the worst case. In normal use of the device it is always advisable to resort to the use of hands-free headset, Therefore, it is appropriate to take into account a low SAR value for the body.
          Greetings from Sicom Testing

  7. Thank you for your previous answer. I have another question: SAR values ​​at the head I guess they relate to the use of the phone during a call. But I wonder if the SAR values ​​related to the body than the values ​​are always measured during a call (that, in reference to the body, would in my opinion not very significant) or during the normal activity of a cell connected to the internet (receive messages, whatsup, notifications, etc.). Thank you

    • The SAR is measured with the transmitter operating at maximum power and in all operating conditions. The indicated value is the greater between those measured. One proceeds in this way both in the case of the head of the body.
      In actual use the actual transmitted power depends on the distance from the base station, noise on the radio channel and the information content to be transferred. The data stream can also be variable in the case of voice call.
      There are also applications in which the device transmits information packets to a few days and there was the question whether it was appropriate to indicate the SAR of the worst operating condition even if in this case would have never been used.
      Both the European Commission that the American FCC concluded that it was still shown the SAR of the worst operating condition.
      Greetings from Sicom Testing

    • Good evening, I would have 3 Questions to Ask:
      1-I read that a terminal that uses more efficiently the radio module, while having a higher maximum SAR value, may produce less electromagnetic emissions compared to one that uses less efficiently. So if the SAR is not enough to assess the “safety”a smartphone, What else can you look?
      2-In addition, the American and European studies are done at the same distance from the source?
      3-When using the phone for longer messages or videos, it is better to just compare smartphones for SAR body or the head (since there will always be a low head equals a lower body SAR)?
      Thank you

      • Good morning Elisa,

        1 – The safety of a smartphone is guaranteed by the fact that it is within the preset limits of SAR. A product that exceeds these limits should not be placed on the market. A product that is within the limits can be placed on the market and is considered safe. The attempt to make further distinctions or classifications takes us on a pretty treacherous terrain.
        2 – The American and European studies are done at the same distance. However, there are technical differences in testing that lead to results not identical in the two cases.
        3 – the SAR “head” It represents situations in which the smartphone is used against the ear. the SAR “body” It represents cases in which the smartphone is used in contact with the body or hand.

        A good day to Sicom Testing

      • Ciao! The question has arisen: according to the SAR formula, it is necessary to know the density of human tissues. Whether the SAR device uses this data, which parameters are you setting for the density of the fabrics? Or the density of human tissue is not very different between different people?

        • Good morning.
          Density is not the important parameter, but the electromagnetic characteristics. These are defined in the standards, they vary with frequency and there are some differences between European and US standards.
          Greetings from Sicom Testing

  8. Good evening, I would like to ask for information about the SAR value of a smartphone with a known US only SAR Level

    Head: 0.28 W / kg
    Body: 0.76 W / kg
    Simultaneous Transmission: 0.92 W / kg
    Hotspot SAR: 0.70 W / kg

    Is there a way to calculate or understand what the EU values ​​in SAR?

    • Good morning,
      there is no way to derive the values ​​of European SAR those USA, We must effetuare the measurement by applying the method prescribed by the European standard.
      Lacking the value of European SAR probably the product needs to be fully certified for the European market understand all aspects required for use of the spectrum, Electromagnetic compatibility and safety.
      Sicom Testing

  9. Hello, I wondered if there existed a variation of the SAR / DAS on a mobile phone with Wi or enabled mobile data and without WIFI / mobile data ? And can there be a correlation between the capacity of the battery of a smartphone and SAR ?
    Thank you.

    • The SAR measurement is used to verify that a product meets the health requirements for users. This is done taking into account all radio interfaces present.
      The exposure of each individual user is different and depends on many variables. First, the distance at which the product is used. Secondly they can perhaps affect the services that are activated, but only if the product is kept in contact or close to the body.
      Battery consumption is not suitable as the SAR indicator because it depends on many factors: a running application or the active GPS receiver may increase the consumption without that there are implications for exposure.
      However, even if we measure the consumption of only radio transmitter, this would not be significant to evaluate the SAR since the characteristics and the position of the antenna in the product affect significantly on the exposure value.

      Greetings from Sicom Testing

  10. Ciao, 1. What SAR indicators should I use when buying a phone (USA o UE) ??? 2. Because some phones have no sar values ​​in the technical specifications, but they only indicate that they are EU certified ??? 3. Because the same sar has different sar values ​​for US and EU measurements?

    • Good morning.
      1. The SAR limit for the United States is 1,6 W / kg referred to a mass of one gram of human tissue, while the one for Europe is from 2 W / kg referred to a mass of 10 g of human tissue. SAR measurements are done in two ways, head e body: head refers to when the product is used near the ear, body refers to all other cases where the product is used close to the body.
      2. When the equipment is within the European limit indicated above, the product is considered safe according to European regulations and can be placed on the European market.
      The SAR values ​​obtained in the various conditions of use are additional information.
      3. Because the value refers to different quantities of mass exposed, also in some cases there are small technical differences in the execution of the test.
      Greetings from Sicom Testing

  11. Good morning,
    1- with frequencies a 27,5 GHz del 5G , the carrier frequency of the electromagnetic fields of mobile phones will also vary ,to date, the exhibition e’ calculated between 100 kHz e 10 GHz ?
    Thank you

    • Good morning.
      Human exposure to electromagnetic fields from mobile phones is assessed through SAR measurements. In the case of portable devices operating in the frequency of 27,5 GHz, if at the time of the assessment, systems approved for the measurement of SAR at these frequencies will not be available on the market, the other measurement techniques available for human exposure will be used. The limits for human exposure of the population have long been defined also for those frequencies, both for the general public and for workers.
      Greetings from Sicom Testing

  12. Ciao, I have several questions,
    -I bought a Samsung phone with 1.6 of Sar in Body with European Union measures It has some negative effects?
    -The envelope can deduce and create more waves?
    -In airplane mode the Sar is reduced to 0?
    -SAR tests are at maximum power? Bluetooth, call, mobile data etc.?

    • Good morning,
      – the European maximum limit of the SAR value is 2 W/Kg, so the value 1.6 is within limits;
      – the envelope generally has no effect on the creation of electromagnetic waves;
      – Airplane mode does not guarantee disabling all wireless functions. However, the electrosmog produced by the mobile phone, tablet or other instruments in this operating regime is very small and the consequent exposure to electromagnetic waves is to be considered negligible;
      – in the laboratory, SAR tests are performed on devices operating at maximum power.
      Greetings from Sicom Testing

  13. Good morning.
    Sorry for the question, I didn't really understand the difference between the European and the American measurement.
    For example my phone has much lower values ​​with the American measurement but with the European one very high values.
    As a result, I actually wonder why and if it actually could cause problems since it has such high values ​​in Europe ?
    Thank you

    • Good morning,
      there are various technical details for which the European SAR measurement is different from the American one.
      If the product has values ​​within the limits set, it can be considered safe.
      Greetings from Sicom Testing

  14. good morning.
    Respect (or failure to comply) by an electronic device the expected SAR limits have an impact on the CE certification of the product itself?
    Thanks for the reply

    • Good morning,
      certainly the product that exceeds the expected SAR limits cannot be placed on the market.
      Greetings from Sicom Testing

    • Good morning,
      the area of ​​the body that is affected by the electromagnetic fields produced by consumer equipment is typically quite concentrated. The measurements are made on a rather large area, for example the whole head or a large area of ​​the body such as the torso, but of all the measures that are taken one goes to look for the part that receives the most power.

      For technical reasons the resolution of this evaluation is not referred to a point but to a small volume. This volume in European standards was set in 10 g of tissue, while in US standards (developed later) was defined in 1 g of tissue.

      It's’ a bit’ like the resolution of a TV: in the US case it's a bit of a resolution’ highest, but this does not change the meaning of the image we are seeing, because in any case the measure is expressed in power / volume involved, it changes a bit’ the sharpness of the image.
      In all cases, the complete image concerns a larger part of the body.

      Greetings from Sicom Testing

  15. salve , I would like to know if the American limits are more’ restrictive ie’ safer than European ones . Yours sincerely

    • Good morning,
      there are some differences in the way of conducting the measurements that do not allow a precise direct comparison of the results.
      However, the US base limit is more restrictive than the European one, being of 1,6 W / kg vs. 2.0 W / kg.
      Greetings from Sicom Testing

    • Good morning,
      SAR tests can only be performed in specialized laboratories.
      The SAR value is reported in the product user manual.
      Greetings from Sicom Testing

  16. Ciao,
    Sono davvero confuso sulla scelta di uno smartphone con un basso SAR.
    SAR testa: 0,279 W / Kg
    SAR corpo: 1.525 W / Kg
    Questi valori sono alti o bassi?
    Un telefono con valore di SAR inferiore è più sicuro?
    Quale dovrebbe essere il SAR per la testa o il corpo inferiore?

    • Good morning,
      to understand if the SAR value of a radio device is low enough, it is enough to remember that in Europe the permitted limit of the SAR value is 2 W / Kg su 10 grams of tissue, while in the United States and Canada the limit is 1,6 W / Kg misurati su 1 gram of tissue.
      A device with SAR value within these limits can be considered sufficiently safe.
      Greetings from Sicom Testing

    • Good morning, can you kindly tell me what the maximum SAR value threshold should be for a person weighing 100kg in order to compare the allowed SAR limit in Europe of 2 W / Kg su 10 grams of tissue. Thank you

      • Good morning,
        The SAR limit value is independent of a person's weight and is always 2 W / kg, i are taken into consideration 10 grams in which there is the maximum power absorption.
        Kind regards
        Sicom Test

  17. Salve, my question is the following: if we have a base station on a roof that emits at approx 40 dBm (10 watt), I would like to know if I am respecting the SAR limits of the staff inside the building.

    Thank you very much.

    A greeting

    • Good morning.
      The human exposure assessment for a product intended to be installed permanently is done in a different way from the SAR. Starting from the technical characteristics of the product and measures, the minimum distance people must stand during use is calculated.
      Greetings from Sicom Testing

  18. One person wrote to us:

    “Reading the article, the following questions arose:

    1) In some sites that report the SAR values, a distinction is made between SAR head and SAR body and in some cases these values ​​also differ significantly (for example the Samsung Note 8 has a SAR head of 0,17 W / kg while the SAR body is significantly higher 1,29 W / kg). Why is there this abysmal difference in some smartphones while in others the values ​​are the same (if they don't even reverse)?

    2) It's’ better to privilege smartphones with head and body SAR values ​​that are equivalent or it is better to look more at one of the 2 data (head rather than body)?

    3) The SAR value reported by the manufacturer is measured during the maximum effort of the equipment? (like a call?) Or it is a value measured during the search for the repeater to establish the connection with the cell?

    4) Smartphones with dual sim stand by technology emit the same amount of radiation as a single sim? And if they are used with only one sim, things get better?

    Our answer:

    The SAR head value depends on the positioning of the antenna with respect to the head, if it is near the microphone and the smartphone is large, the antenna moves away and the SAR value decreases.

    The SAR body is measured on all sides of the product and the worst values ​​are reported, therefore the position of the antenna and the size of the smartphone matter less.
    It's’ It is important to be aware that these products, even when carried in your pocket, expose us to electromagnetic fields when exchanging data; and this almost always happens unless the data has been disabled.

    The SAR body indicates the exposure to which one is subjected in this case, while the SAR head is the one to which you are subjected during a telephone conversation holding the phone close to your ear. So the most interesting value for each of us depends on the use we make of the product.

    Keeping your smartphone in your bag instead of in your pocket makes a lot of difference.

    If you make long phone calls, better to use the speakerphone or a bluetooth headset by placing the phone on the desk.

    Compared to these precautions, the product's SAR value is a less determining factor, but it's still a factor.

    Regulatory bodies wanted SAR values ​​to be public to induce designers to reduce them as much as possible.

    However, let's not forget that all products that are regularly on the market are within limits that are considered safe, therefore used appropriately they are not to be considered harmful. It's’ It is of course important that all products are properly tested before being placed on the market.

    Greetings from Sicom Testing

  19. Good evening and thanks for the answers you provide,
    I would like to know when the European and US SAR values ​​are obviously different on the net, they are tested under the same band conditions? meaning they use the same frequency? another question, at this point if I have a lower SAR value than USA and higher Europe, it shouldn't be the other way around?

    • Good morning.
      The frequency bands used in Europe and the US are different and SAR measurements are carried out in the bands relevant to the geographic area concerned. In addition, there are some technical details in the execution of the tests which in some cases can lead to differences. For all of these reasons, the same SAR values ​​are not found for Europe and the USA. However, I confirm that all other factors being equal, the fact of averaging the measure on 1 g of tissue (USA) instead of 10 g of tissue (Europe) it should capture a higher part of the spatial absorption peak, so give it a little fit’ higher.
      Greetings from Sicom Testing

  20. Hey!
    Diciamo che abbiamo due cellulari.
    -Il cellulare A ha questi valori sar: testa 0,558 W / Kg, corpo 0,986 W / Kg
    -Il cellulare B ha questi valori sar: testa 0.191 W / Kg, corpo 1.034 W / Kg
    1) La radiazione trasmessa tramite filo vivavoce in relazione a quale di questi valori è? Trasmetterà più radiazioni alla testa in caso di smartphone A o B?
    2) Sebbene il cellulare B abbia un valore sar corporeo leggermente superiore, contemporaneamente ha un valore sar della testa notevolmente inferiore rispetto al cellulare A. Qual è la causa di questa differenza? Solo il posizionamento dell’antenna?
    3) Esiste una distanza massima tra corpo / testa e dispositivo dove questi valori sono applicabili, oppure sono da considerarsi solo quando siamo a contatto con il dispositivo?
    3b) Se la risposta sopra è che i valori sar sono applicabili solo quando si è in contatto con il dispositivo, possiamo supporre che il dispositivo meno dannoso sia quello con il valore sar generalmente più basso (quindi campo elettromagnetico più debole)? Nel nostro esempio questo sarebbe il cellulare A perché il suo valore sar più alto (valore sar corpo) è inferiore al valore sar più alto B del cellulare (di nuovo valore sar corpo). La mia idea alla base di questo è che il valore sar più alto possibile è in grado di creare un campo elettromagnetico potenzialmente più forte. Quindi, se i valori sar sono applicabili solo quando tocchiamo il telefono, mi chiedevo quale valore dovrei prendere in considerazione quando parlo in vivavoce.
    Non ho molta conoscenza della fisica, per favore correggimi se la mia ipotesi è sbagliata.

    Grazie in anticipo!

    • Good morning.
      1) The radiation transmitted through the hands-free wire is not related to any of these values.
      2) It can be the location and type of antenna.
      3) Normally the values ​​are measured in contact. The measurements are repeated in different positions following the indications of the standards and the reported value is the worst of those obtained.
      3B) Removing the cell phone from the body, including head and hand, even a few centimeters, the absorption of radiation is rapidly reduced.
      Greetings from Sicom Testing

  21. Spett.le Sicom, congratulations for the competence and importance of your work. Why not all companies express the SAR value in their cell phone packages? We often read that these devices comply with European regulations but without reporting the SAR figures. Finally, I would like to know if a cell phone on standby can transmit its waves through a perforated wall 8 cm. I ask because once I left an old generation mobile phone on for a whole night behind a wall like the one indicated at the head of someone who slept in the other room, whose total distance between the head and the cell phone was 25 cm including the perforated wall from 8 cm. Many thanks for your attention and response. I greet you distinctly.

    • Good morning.
      When the information is not available on the packaging, it can probably be found on the manufacturer's website. In reality, the important aspect is that the product is within the limits set by the regulations and considered safe.

      The idle telephone transmits and receives information. The amount is very low if the data connection is not enabled. Instead, it increases with data connection and applications active on smartphones.

      Human exposure in the use of a mobile phone changes a lot between the case in which the product is in contact with the person and when it is a few centimeters away. In this case I believe the distance of 25 cm is to be considered sufficiently safe.

      Greetings from Sicom Testing

  22. Spett.le Sicom, I would like to know if a wall inside a house, albeit relatively thin (8cm) reduces the transmission of waves coming from an older generation cell phone. Thanks Good job

    • Good morning.
      A wall can be an obstacle to the propagation of radio waves, it depends on the frequency band in which the cell phone is operating and the wall material.
      If, on the other hand, the concern is human exposure, the fact of getting away from 8 cm or more from the mobile phone leads to a significant reduction.
      Greetings from Sicom Testing

  23. Ciao, my question is … Because some devices have SAR in Europe but SAR is hidden in the United States? As in the case of the Samsung a40

    Thank you

    • Good morning.
      If it refers to the SAR values ​​shown in the manual, basically, for the models sold on the European market, only the SAR values ​​with European limits are reported, while for the models sold in the United States the values ​​shown are those relating to the USA limits.
      On the manufacturer's website there should be both values.
      Greetings from Sicom Testing

  24. Salve, I have some questions regarding the SAR measurement method for mobile phones:
    – When the defined worst case measurements are taken, to define the SAR for each frequency in which it works, a single test is made with the phone at maximum power which works at the same time in all the available frequencies or several measurements are made, separately for each frequency, to then establish the maximum value at the end?
    – In which time interval the SAR measurements are made and then arrive at the final value?
    – If manufacturers only declare SAR value without further specification, they usually refer to the maximum value of which frequency?

    Thanks in advance for your reply and good luck!

    • Good morning,
      -SAR measurements are performed on each frequency band the device can work on, if frequencies of several bands can be used simultaneously, the SAR values ​​are summed according to the methods indicated by the standard.
      -All SAR values ​​are obtained as an average over a period of 6 minutes (for Europe).
      -The declared SAR value is the highest of all those measured.
      Kind regards
      Sicom Test

  25. One person wrote to us:
    1) In one of the answers you explicitly refer to bluetooth headsets when it comes to making long phone calls. Normal earphones (with the thread) are not recommended? They make the body perceive a greater value of electromagnetic field than bluetooth headsets?

    2) The second question concerns smartphones that also implement 5g technology. The SAR value in this case is influenced by the presence of the 5g antenna? (which from what I know is a significantly different technology than 4g, therefore it should require a different hardware architecture). In other words, the possible presence of the antenna to receive / transmit data in 5g increases the SAR value? If yes in a considerable or negligible way compared to a smartphone exclusively 4g?

    I thank you again for your professionalism and friendliness.

    Our answer:
    1) Corded earphones have no influence on the SAR values ​​of the device. The advantage of using earphones is that the mobile phone can be kept away from the body during the phone call.

    2)The SAR value, in addition to the communication technology, it also depends on the device, moreover, communications in 4G or 5G are alternative and do not take place simultaneously, therefore 5G does not increase the SAR of 4G; the SAR values ​​of a device while transmitting in 5G are measured separately from the SAR values ​​of the same device while transmitting in 4G, it is not possible to know in advance in which mode the SAR will be higher.

  26. Good morning, I would have other clarifications regarding the SAR values ​​of mobile phones:
    – How come in recent years the limit value of 4 W / kg relative to the limbs but only those of the head and body?
    – The tests relating to the body carried out in the laboratory and the values ​​found are correlated to the limb limit values? Or, if I keep the device in my pocket, the test referred to the body refers to the possible absorption of the thigh or there should be a separate analysis to evaluate it?

    Thanks in advance and good luck with your work!

    • Good morning,
      -According to the EN standard 62209-2 the measurement method is the same for trunk and limbs, generally referred to as a body, hence a device that is within the limits of 2 W / Kg for the trunk is also compliant for the limbs that have a higher limit value.
      Greetings Sicom Test

  27. Ciao, I would like to know if there is any reason why now several brands do not specify SAR in the United States such as Samsung (A52, A32, S20FE …), for most of their latest models it does not even appear on the official page It could be because it did not pass the test in the US but in Europe it did? and that is why they cannot put the results, because it is not marketed there.

    Thanks in advance

    • Good morning,
      In some cases the devices are originally diversified between America and Europe (for example the Samsung A52 sold in Europe is not necessarily the same Samsung A52 device sold in the United States), therefore, for a device sold only in Europe, tests for the American market are not performed.
      Greetings Sicom Test

      • Good evening. I bought some freebuds 3: what is the Sar level of a kind of wireless earphones like this compared to the emissions of a smartphone?
        in conclusion, i know my smartphone is around 0,5 head e 1 body. With the earphones with what Sar values ​​I am dealing with? Thank you

        • Good morning,
          To know the SAR value of the earphones (if it is not declared) you have to test them; usually these types of earphones have very low transmitting powers (some mW), in this case the test is not performed because with such low powers the device cannot exceed the SAR limit values ​​established by the legislation.
          Kind regards
          Sicom Test

  28. Good morning. As for the SAR values, I don't know if Xiaomi is a reliable brand. I would like to buy a Xiaomi 11 lite. Alternatively, a Samsung A52 or A72. Since I spend many hours on the phone, even without a headset, which one do you recommend?
    Xiaomi has very interesting declared values. I'm going Samsung. But both manufacturers detect the SAR at the same distance in mm from the head and body?

    Thanks so much!

    • Good morning,
      The values ​​are measured according to the harmonized EN standards 50360 for the head and EN 50566 for the body, regardless of the smartphone, the measurement method is the same; a lower SAR value means less exposure to the electromagnetic field.
      Kind regards
      Sicom Test

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Sicom Testing will be happy to answer them.