Campbell Scientific CS110 Electric Field Meter - Manual (Page 9)

CS110 Electric Field Meter
1. General Description
1.1 CS110 Introduction
Atmospheric electric fields have been measured for decades by electric field
meters nicknamed “field mills”. Traditional field mills employ a spinning
metal rotor (vane) electrically connected to Earth ground, placed between the
external field and stationary metal sense electrodes. The grounded spinning
rotor alternately shields and exposes the sense electrodes from the electric field
to be measured, resulting in a modulation of the induced charge on the sense
electrodes. Typically, a pair of charge amplifiers converts the modulated
charge into AC voltages that are synchronously rectified and filtered to form a
low-frequency voltage proportional to the low-frequency (
≤10 Hz) electric
field.
easured for decades by electric field
meters nicknamed “field mills”. Traditional field mills employ a spinning
metal rotor (vane) electrically connected to Earth ground, placed between the
external field and stationary metal sense electrodes. The grounded spinning
rotor alternately shields and exposes the sense electrodes from the electric field
to be measured, resulting in a modulation of the induced charge on the sense
electrodes. Typically, a pair of charge amplifiers converts the modulated
charge into AC voltages that are synchronously rectified and filtered to form a
low-frequency voltage proportional to the low-frequency (
≤10 Hz) electric
field.
Ground Strap
Case Lid
Sealed Connectors
Stator
Reciprocating Shutter
FIGURE 1. CS110 Electric Field Meter
1