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

as a change in probe impedance which affects the shape of the reflection. The

shape of the reflection contains information used to determine water content

and soil bulk electrical conductivity.

5. Specifications

5.1 Physical Description

TABLE 5-1. TDR Probe Physical Properties

Probe

Model

Rods Probe Head Cable Type

Maximum Soil

Bulk Electrical

Conductivity

Maximum

Cable Length

(measured from

the tips of the

probe’s rods to

the TDR100

Reflectometer)

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 15 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 25 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 15 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 25 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 15 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 25 m

5.2 Measurement Parameters

TABLE 5-2. 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

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 27 28

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Campbell TDR Manuale Pagina 8

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