Campbell Scientific CS110 Electric Field Meter User Manual
Page 23
CS110 Electric Field Meter
Consequently, a downward facing and elevated configuration as illustrated in
Figure 8 is recommended for long-term field applications.
FIGURE 8. CS110 2 Meter CM10 Tripod Site
Inverting the CS110 reduces the effective gain while elevating it’s height
above ground enhances the gain, with respect to an ideal upward-facing flush-
mounted geometry. It should be mentioned that this gain enhancement reduces
the effect of unwanted electrical field offsets. A site correction factor C
site
is
necessary to correct M
parallel_plate
for non flush-mounted configurations
[McGorman and Rust]. The corrected multiplier M
corrected
becomes as follows:
M
corrected
= C
site
⋅M
parallel_plate
(Eq. 5).
In equation 5, M
parallel_plate
is unique for each CS110, yet independent of a given
site, whereas C
site
is unique for each given site, yet independent of the
particular CS110 used at the site. C
site
is typically determined by using a flush-
mounted upward-facing unit in the vicinity of the site needing correction.
Campbell Scientific, Inc. developed the site correction facility illustrated in
Figure 9 to determine C
site
for various site configurations.
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