19
The S mode can also provide values correlated with the high-frequency capacitance sig-
nal, but the measurement depth is different between the D mode and S mode. The D mode
measures the moisture content at relatively deeper point, and on the other hand, the S
mode measures the moisture content at relatively shallower point.
5 Others [
②
Make User Cal]
• What is a user calibration?
The calibrations on this unit have been made on the ba-
sis of the relationship between high-frequency capaci-
tances and moisture contents. The D mode is correlated
with high-frequency capacitance. Understanding the
relations between the moisture content of the object to
be measured and the D mode value provides relation-
ship between the high-frequency signal and the mois-
ture content. Custom calibrations may be created bye
user to allow the HI520-02 to be used for more than just
the factory calibrations. To create the user calibrations,
prepare multiple samples (2 to 8 pieces) with different
moisture contents and record the D mode values and
corresponding moisture content obtained by a different
moisture method (see Fig. 1).
①
②
③
④
[Fig. 1]
D mode value
M
oi
st
ur
e c
on
te
nt (
%
)
