2 site correction – Campbell Scientific CS110 Electric Field Meter User Manual
Page 22
CS110 Electric Field Meter
FIGURE 7. NIST calibration certificate
Careful removal and replacement of the stator on the CS110 does
not invalidate the factory derived M
parallel_plate
of a given unit.
However, switching stators with another unit or accidentally
bending the stator, shutter or sense electrodes invalidates the
factory parallel-plate calibration because of possible electrode
dimensional changes.
NOTE
5.2 Site Correction
As previously mentioned, each CS110 is factory calibrated in a parallel plate
calibration fixture resulting in calibration equation 4. However, when
monitoring the Earth’s electric field, equation 4 is valid only if the instrument
aperture is mounted flush with the Earth’s surface and upward-facing. Yet for
permanent outdoor measurements of electric field, a flush-mounted and
upward-facing orientation is problematic because of dirt, bird droppings, rain,
etc., collecting on the sense electrodes and fouling the measurement.
14
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