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Electrical Engineering
Why Do EMF Meters Measure ELF/VLF Differently?
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[QUOTE="Merlin3189, post: 5854262, member: 542077"] I don't know anything about EMF meters, but I'd hazard a guess at the reason for discriminating between EM waves at VLF (and below) versus those at substantially higher frequencies (you don't specify a region for these.) My first thought was near field and far field, as you are always in the near field region at VLF and below. But at what most people call RF, say MF and above, you are still going to be within the near field for much of the time. So, not knowing your context, I wonder whether it is to do with radiation resistance? In common situations any energised man-made conductor is going to be a very small fraction of a wavelength at VLF and below and have a tiny radiation resistance. So unless the currents are very large, there is very little radiation. On the other hand there can be a detectable magnetic field close to the conductor. Why or how people measure RF power density, I don't know. [/QUOTE]
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Why Do EMF Meters Measure ELF/VLF Differently?
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