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trying to buy quality EM meter and need help
November 10, 2018
3:02 am
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miran80
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November 9, 2018
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Hi all!

Just joined because I became interested in this topic when power company decided to build a 2x110kV power line near my house. I would like to approach this problem rationally with measuring
tools to determine how far the EM field can reach before it becomes indistinguishable form other present radiation. Upon reading more about it I also became more aware of other source, especially HF ones
inside my home and cell towers.

I began to search for a viable measuring tool and quickly realized that I’ll need to buy several to cover different frequencies and radiation magnitudes. If I may, I would like to ask everyone here a few questions:

1. Why do experts recommend measuring RF with a single meter while low frequency radiation is measuring magnetic radiation separated from electrical field?

2. Am I required to re-certify or re-calibrate my meters every once in a while to assure that the accuracy is still decent? I am afraid that this might prove to be very costly, especially in my country.

3. Some recommend using body volt meter to measure the electric potential on the body itself? How does it compare with mid tier hand-held meters and how would one compare the measurements from both methods?

4. I noticed that pricier gauss meters measure magnetic field in all 3 axis, 3d basically. But I couldn’t find one that does the same with electrical field. Why is it so and do I even need to measure it in 3d? If I measure in 1 axis, do I need to take 3 measurements and combine them?

5. What exactly does noise represents on the measurement screen (I noticed HF meters often include signal amplifier but not LF ones)?

I did email all of these questions to 2 re-sellers and 1 manufacturer and haven’t received any replies in days even thou the meters in question were $500-$1000. I hope I can find some answers on this forum:)

Thank you all for your effort and time.

November 10, 2018
11:51 am
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Peter Williamson
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Hi miran80 and welcome to the forum. I may be able to answer some of these questions and hopefully others will be able to contribute as well.
In general I would suggest spending some time on the main site here for information about meters. There are several articles, instructional videos and reviews which might help clarify some of these questions.
1. Not sure. Several low frequency meters combine magnetic and electric field measurements. I’ve never seen a discussion of the magnetic field associated with RF – the electric field is usually the main concern. Maybe there is no mag field, as there is no current flowing?
2. I’m not aware of a need to recalibrate meters. But if there are local regulations and you are working professionally then it would make sense to follow them.
3. Several building biologists use a standard power frequency electric field meter to measure body voltage. There are articles on how to do it somewhere – I don’t have references to hand but I could probably find them if you are interested. Guy Hudson gave a very good explanation in his recent interview with Lloyd, which should be available if you have access to the archive.
4. With a single axis meter I usually take the highest reading. A bit like turning the ariel on a portable radio to get the best reception.
5. No idea – I don’t have a ‘noise’ reading on any of my meters.
Also interesting that Guy Hudson uses quite basic meters even when working professionally. Some use very expensive spectrum analysers or oscilloscopes – depends what you are trying to do, who it is for etc.
Hope some of this helps and others can fill in the gaps.

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