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 cover a wide range on 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

– Gauss meter 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”.


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.