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AC Magnetic Field Measurements

Wherever there is AC current, there is AC magnetic field which can be measured in mG or nT.

Our calibrated EMFs testing equipment covers a wide range of the spectrum, from 5Hz to 1 MHz:

–  Low-frequency analyzer ME3851 A    Freq. range: 5 Hz to  100 kHz.   Measuring range: 0.1 – 1,999 nT

– 3D-LF analyzer with data logger  NFA1000    Freq range: 5 Hz – 1000 KHz

– Gaussmeter 4100 series

 AC Magnetic field around House

AC Magnetic Field profile around a house on real-time basis measured and logged by NFA1000. According to Building Biology Standards, the green zone is of “no concern”  and the yellow zone is of “slight concern”.

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Ac Magnetic Field in a residential area

AC Magnetic Field radiated by high voltage underground cable plotted on Google-Map, measured and logged  by  NFASoft and GPS

 

IBE Safety  Standards  (SBM-2008)

Exposure Type Units No Concern Slight Concern Severe Concern Extreme Concern
AC magnetic fields  (LF/VLF/ELF) [100 nT = 1 mG] nT < 20 20 – 100 100 – 500 > 500

The most effective remedy is to switch off the power supply source or keep a distance.  Otherwise shielding of AC magnetic field is quite difficult and costly. It requires electrical engineering skills.

Between 300 and 400 nT  (3-4 mG), the possibility of cancer after long-term exposure increases by 3 folds.