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TDR Probes CS605, CS610, CS630, CS635, CS640, CS645

3. Specifications

3.1 Physical Description

TABLE 3-1. TDR Probe Physical Properties

Probe

Model

Rods

Probe Head

Cable

Type

Maximum Soil

Bulk Electrical

Conductivity

CS605

length 30.0 cm

diameter 0.475 cm

length 10.8 cm

width 7.0 cm

thickness 1.9 cm

RG58

1.4 dS/m

CS610 length 30.0 cm

diameter 0.475 cm

length 10.8 cm

width 7.0 cm

thickness 1.9 cm

RG8

low loss

1.4 dS/m

CS630 length 15.0 cm

diameter 0.318 cm

length 5.75 cm

width 4.0 cm

thickness 1.25 cm

RG58

3.5 dS/m

CS635 length 15.0 cm

diameter 0.318 cm

length 5.75 cm

width 4.0 cm

thickness 1.25 cm

LMR-200

low loss

3.5 dS/m

CS640 length 7.5 cm

diameter 0.159 cm

length 4.5 cm

width 2.2 cm

thickness 1.0 cm

RG58

5.0 dS/m

CS645 length 7.5 cm

diameter 0.159 cm

length 4.5 cm

width 2.2 cm

thickness 1.0 cm

LMR-200

low loss

5.0 dS/m

3.2 Measurement Parameters

TABLE 3-2. TDR Probe Measurement Properties

Probe Model

Probe Offset

(meters)

Probe Constant for Electrical

Conductivity (EC) Measurement, Kp

(using this constant will provide EC in

siemens/meter)

CS605 and CS610 0.090 1.74

CS630 and CS635 0.052 3.36

CS640 and CS645 0.035 6.40

4. TDR Probe Description

4.1 General

TDR probes are the sensors of the TDR measurement system and are inserted

or buried in the medium to be measured. The probes are a wave guide

extension on the end of coaxial cable. Reflections of the applied signal along

the waveguide will occur where there are impedance changes. The impedance

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