Campbell Scientific TDR Probes CS605, CS610, CS630, CS635, CS640, CS645 User Manual
Page 12
TDR Probes CS605, CS610, CS630, CS635, CS640, CS645
can affect the accuracy and resolution of water content measurements.
FIGURE 7-2 presents a series of waveforms when a solution with an electrical
conductivity of 1.0 dS m
-1
is added to a soil which has essentially no salt
present. FIGURE 7-3 shows data for solution with high electrical conductivity.
water content = 9.5%
water content = 25%
FIGURE 7-2. Waveforms collected in a sandy loam using CS610 probe
with RG8 connecting cable. Volumetric water content values are 10,
16,18, 21 and 25%. Solution electrical conductivity is 1.0 dS m
-1
.
water content = 18%
water content = 37%
FIGURE 7-3. Waveforms collected in a sandy loam using CS610 probe
with RG8 connecting cable. Volumetric water content values are 10,
18, 26, 30 and 37%. Solution electrical conductivity is 10.2 dS m
-1
.
6
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