Campbell Scientific TDR100 Time Domain Reflectometry Systems - Manual (Page 16)

TDR100
FIGURE 4-1. PCTDR waveform for CS610 in water.
The algorithm will use the length of the waveform set by the Waveform
Length. After finding the probe beginning, the algorithm searches over the
remaining waveform for the end of the probe. The length must be large
enough to display a short distance past the end of the probe under the wettest
expected conditions.
TABLE 4-1. Recommended Waveform Length values for
range of TDR probe rod lengths assuming soil porosity of
0.60.
Probe rod length (m) Recommended Waveform Length
value (m)
0.10 to 0.20 3
0.21 to 0.30 4
0.31 to 0.40 5
0.41 to 0.6 6
0.61 to 0.75 7
0.76 to 1.00 9
Use the recommended values listed in Table 1 or use the following equation to
estimate the required window length, L
w
.
10