Boltek EFM-100 v.2 - Manual (Page 8)

C H A P T E R 1 - I N T R O D U C T I O N
2
1 AC wall adapter power supply
120VAC to 12VDC for North America
220VAC to 12VDC for Europe
1 field mill grounding wire
6 sensitivity plugs (0.75X, 0.63X, 0.5X, 0.33X, 0.25X, 0.2X)
1 mast (¾” NPT X 6”)
1 mounting flange
1 CDROM containing Windows software and USB drivers
1 user manual (this is it)
Unpack your EFM-100 and make sure all the parts are included.
Theory of Operation
Electric fields develop wherever there is a difference in electric potential. If the electric
field gets high enough you can feel your hair stand on end (if this happens outdoors during
a thunderstorm crouch down with your feet together as you are about to be struck by
lightning.) An electric field is what attracts your hair to a charged comb or a charged
balloon.
Electric field is measured in Volts per meter (1 meter = 3.28 feet.) The electric fields which
accompany thunderstorms normally measure in the thousands of Volts per meter, usually
abbreviated to kV/m. Lightning can be detected as a sudden change in the electric field.
The electric charge contained in a thundercloud also generates an electric field. This field
can be measured on the ground