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What is Electromagnetic Field (EMF) Testing?

Updated: Mar 6

An electromagnetic field test measures the amount of electric, magnetic and electromagnetic exposure a product or equipment emits to its users, including static, extremely low frequency, and radiofrequency EMF. There are different regulatory limits for occupational and general public exposure. EMF testing is required to assess the levels of exposure and compare them against reference levels.


With the exponential growth in EMF-generating technologies and the growing concerns over the health risks of electromagnetic radiation, a lot more people are asking this question.

Every device that communicates wirelessly, and every device that runs on AC power, emits electromagnetic (EMF) radiation. Normally, the EMFs we are exposed to in our homes fall into the non-ionizing part of the spectrum. This includes frequencies of up to 300GHz. Non-ionizing radiation refers to any type of electromagnetic radiation that does not carry enough energy per quantum to ionize atoms or molecules—that is, to completely remove an electron from an atom or molecule.

Usually, the two main types of EMFs found in our homes are either a low-frequency EMF or a radiofrequency EMF. Special equipment needs to be used for each different type of EMF being measured. This will depend on what frequencies are being tested and what is the source of the EMF. For example, to accurately test a nearby power pylon or a substation, we will need to use equipment that is capable of measuring 50Hz or 60Hz. As those are the frequencies used for high voltage power supply. It is also important that the person operating the equipment knows how to use it properly, it is no use to have the right equipment when the person conducting the EMF testing is not fully trained and does not have a good understanding of how to accurately measure different frequencies and types of EMFs.

To conduct an EMF test, measuring an external EMF source (not produced within the measured property), it is important to spend enough time in each room of the property and make sure to measure all corners as well as the middle of the room. This will provide a good overall value that can be turned into an average, which is then used to assess any potential health risks. A slightly different approach is usually taken when measuring sleeping areas and internal EMF sources such as house main lines, smart meters, or various home appliances.

Written by EMF Testing Ltd, www.emf-testing.co.uk

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