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How to Measure EMF

ElectroMagnetic EMF Spectrum

How to Measure EMF: The Art of Knowing What You Are Studying

There are a lot of people concerned about electromagnetic fields (EMF) and electromagnetic radiation (EMR or also known as radio frequency (RF)).  People want to know how to measure EMF. So much so, that they purchase detectors and meters for themselves and attempt to study their own property and homes.  It is great to take responsibility for your own concerns! However, there are likely many things that could be confusing your personal emf testing and rf testing assessments.

Electromagnetic EMF Spectrum chart - Healthy Building Science - emf testing - rf testing

ElectroMagnetic EMF Spectrum

The electromagnetic spectrum is organized by frequency. Generally, lower frequency radiation is on the left, and higher frequency radiation is on the right. See the above graphic.

The properties of electromagnetism change at different frequencies and electric and magnetic fields behave differently along the spectrum.  A material that is transparent to visible light can be opaque to infrared light, but then again transparent to radio frequency radiation (e.g., glass).  Chrome is highly reflective to all of these frequencies, but nearly invisible to IR cameras because it reflects much more heat energy than it emits.  So how do you measure the temperature of a chromed device if you cannot attach temperature sensors (thermocouples) to it?

EMF Meter near an electrical panel - Healthy Building Science - environmental consultants

EMF Meter Should Detect Hot Spots – Magnetic Fields Near Electrical Panel. [Measuring 157 milliGauss (mG)]

Measuring Magnetic Fields

Meters measuring magnetic fields strength analyze the flux (changing field properties) of the magnetic field.  A meter in motion will not measure this accurately, because measurements will be artificially elevated as you move through a magnetic field.   While an accurate quantitative measurement cannot be made while moving, a qualitative measurement can be made to show places where more investigation is recommended. Walking through a building with a magnetic field meter taking real-time measurements is still an effective strategy of finding “hot spots.”

Measuring Radio Frequency (RF) Radiation

Higher than expected radio frequency (RF) power density can be just as confusing. RF can act sort of like X-rays, penetrating through many materials, reflecting off others.  This can produce apparently high power densities in certain areas and make finding the source of those RF radiations more difficult. Using separate RF meters or antennas with the capability of omnidirectional AND more focused targeting can be useful in RF testing.

man using Directional RF Antenna at Smart Meter - Healthy Building Science - RF Testing

David Sasse using Directional RF Antenna at Smart Meter

Using Omni Directional RF Antenna - Healthy Building Science - environmental consultants

Alex Stadtner Using Omni Directional RF Antenna at PV Inverter w: Wireless Signal

If you find areas that raise your concerns it is best to refer to an expert in the field – much like a medical generalist refers to a specialist.  A qualified EMF specialist is trained specifically in the use of high-quality equipment, has area-specific knowledge, and has experience with many different buildings and situations.

EMF Testing Services

If you bring your EMF concerns to Healthy Building Science, it usually makes our jobs easier by giving us a heads-up as to where to start our investigation and EMF testing.  Don’t be surprised if our investigation brings unforeseen conclusions! Often we deliver better than expected news and peace of mind, and no additional measures are recommended or the fix is more simple than you think.

man testing emf in electrical panel - Healthy Building Science - emf testing - rf testing

Author (Cameron Das) Performing Diagnostics for EMF Wiring Errors – DO NOT TRY THIS AT HOME

Healthy Building Science is an environmental consulting firm which provides EMF testing, emf surveys, emf consultations and RF testing for the greater San Francisco Bay Area and all of Northern California.

8 Responses to “How to Measure EMF”

  1. Alex says :

    There is no one meter that can measure effectively at all the different frequencies. Additionally, electric fields and magnetic fields can be teased apart at lower frequencies and therefore measured with different meters. You would probably benefit from an online EMF training from the Building Biology Institute. And you might get more value from hiring a local Building Biologist than buying 4-5 meters and trying to figure it out on your own. But if you’re a good researcher and enjoy meters – go for it!

  2. khaled omar says :

    want an device to measured EMR induced from the passing current in coil

  3. Brian says :

    What is your view on standard EMF measurement devices (Gaussometers). I have read that most can’t measure EMFs of very high frequencies. So I want to avoid getting the wrong one. Is there a meter that covers all EMF measurement? I am experiencing classic symptoms of feeings of skin burning & tingling at most precisely at the backs of the hands and feet sustained even throughout the night. Always happens when at home in a stationary position or when sleeping. Naturally enough it leading to a very disturbed sleep pattern for well over a year now. I am also getting some crusty rash marks on the back of my hands & forehead. Any help or direction would be appreciated.

  4. Alex says :

    If you’re sensitive to Radio Frequency (RF) radiation, heading to a more rural locale is certainly a short-term option. Eventually the big tech companies want to “bring wifi to the world,” so there may be satellites and balloons deployed even in rural areas down the road. Travel safely.

  5. Matt says :

    I have a cell phone tower 50-foot from my apartment they have 5G going and the workers tell me themselves that it’s kind of harm people and it’s going to affect people and it’s probably why my ears are ringing the only thing I’ve been doing is downloading apps on my phone for UT electro magnetic frequencies and trying to measure that way I don’t know I buy a specialized to a spit a couple buddies in Mexico told me that I need to just pack up and get the hell away from this go to a radiation-free town

  6. Alex says :

    Hi Thomas,
    When you say “high EMF measurements,” what are you referring to? Radio frequency radiation, electric fields, dirty electricity, magnetic fields, DC any of the above? What units and what are you measuring? Need more information to help with this EMF inquiry.

  7. We have cell towers on our roof with high EMF measurements – since they use DC power why do we get them. We also get high measurements from cell towers that are not powered – could power be leaking to them from some other source

  8. priscila says :

    I like this post, enjoyed this one regards for posting. “The world is round and the place which may seem like the end may also be only the beginning.” by George Baker.

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