How is an EMF meter/detector used in the field?
EMF meters fall into two categories: single-axis and tri-axis. Single-axis meters are cheaper and measure only one dimension of the field. Tri-axis is preferred because they measure all three axes simultaneously. Most of these meters measure the electromagnetic radiation flux density or the amplitude of any emitted radiation. Electromagnetic fields are either AC (alternating current) or DC (direct current). AC is usually from man-made sources and DC is emitted naturally from the earth’s geomagnetic field. EMF meters measure this radiation in milligauss and will read 0 milligauss in the absence of a moving magnetic field. Most meters are calibrated to measure electromagnetic radiation between 50 – 60 Hz but other meters are more sensitive to frequencies as low as 20 Hz.
