Manual

C H A P T E R 1 - I N T R O D U C T I O N

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