NOTE:
Both the upward-facing and the inverted and elevated unit need to be electrically connected
to earth ground. This can best be accomplished with a grounding rod and wire connected to
ground lugs provided on both the upward-facing plate and on the mounting bracket on the
standard CS110.
Ideally, site correction should be done in the absence of precipitation and during the presence of
slowly varying and bipolar electric fields with magnitudes large enough to make instrument
offset errors negligible. These conditions may be infrequent in practice, making site correction
using a flush-mounted, upward-facing unit challenging. Precipitation and blowing dirt can result
in questionable measurements by an exposed, upward-facing unit. The electrodes of an
upward-facing unit should be cleaned after it has been exposed to blowing dust and/or
precipitation.
The measurement of meteorological parameters such as rainfall, along with the averaging and
data storage capability of the CS110 can be used to autonomously measure, process, and store
data to aid in site correction.
Campbell Scientific, Inc. has performed a site correction on a CS110 2-Meter CM110 Tripod Site.
The collected data between an upward-facing unit and a downward facing CS110 2-Meter CM110
Tripod site is illustrated in the following graph. A best-fit line computed from the data resulted in
C
site
= 0.105 ± 4%, which is valid for users at other sites who use the same site dimensions on
level terrain clear of vegetation.
CS110 Electric Field Meter 24
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