Campbell Scientific TDR Probes CS605, CS610, CS630, CS635, CS640, CS645 - Manual (Page 6)

Table of Contents
ii
B. Correcting Electrical Conductivity
Measurements for System Losses......................B-1
B.1 Description of Method..................................................................... B-1
B.2 Detailed Method Description........................................................... B-2
B.2.1 Collecting Reflection Coefficient with Probes Open and
Shorted.................................................................................. B-2
B.2.2 Determining K
p
........................................................................ B-2
B.2.3 Deriving Calibration Function.................................................. B-3
B.2.4 CR1000 Program for Collecting ρ
open
and ρ
shorted
Values......... B-4
Figures
7-1. Waveforms collected in a sandy loam using CS610 probe with
RG8 connecting cable. Volumetric water content is 24% and
bulk electrical conductivity is 0.3 dS m
-1 ......................................... 5
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 . ................. 6
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
A-1. Example of start of TDR probe determination ................................ A-2
B-1. Example of corrected and uncorrected electrical conductivity
values. .......................................................................................... B-3
Tables
5-1. TDR Probe Physical Properties ........................................................... 2
5-2. TDR Probe Measurement Properties................................................... 2
A-1. Dielectric permittivity values for range of temperatures. From
equation [A5]. .............................................................................. A-5
B-1. Standard KCl Solutions ................................................................... B-2