Boltek EFM-100 v.2 - Manual (Page 9)

C H A P T E R 1 - I N T R O D U C T I O N
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For an accurate electric field reading the field mill needs to be mounted flush with the
ground. Mounting the field mill flush with the ground is not practical however as water,
dirt, insects, etc will collect around the sense electrodes and contaminate the electrode
insulators.
Figure 1: Electric Field Mill at Ground Level
Mounting the electric field mill above the ground surface will enhance the electric field
resulting than an incorrect high reading. Sensitivity Plugs are provided to reduce the
sensitivity of your field mill and compensate for the higher field mill readings.
Figure 2: Intensification of Electric Field