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TDR Probes Table of Contents

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1. Introduction..................................................................1

2. Electromagnetic Compatibility...................................1

3. Specifications ..............................................................2

3.1 Physical Description.................................................................................2

3.2 Measurement Parameters..........................................................................2

4. TDR Probe Description ...............................................2

4.1 General......................................................................................................2

4.2 Installation ................................................................................................3

4.3 Probe Offset for Water Content Measurement .........................................3

4.3.1 General............................................................................................3

4.3.2 Calculating Probe Offset.................................................................3

4.4 Probe Constant for Electrical Conductivity Measurement .......................4

4.4.1 Electrical Conductivity Error from Attenuation .............................4

5. TDR Measurement Error from Cable Attenuation

and Soil Electrical Conductivity..............................4

5.1 Water Content Measurement Error from Cable........................................4

5.2 Water Content Measurement Error from Electrical Conductivity............5

6. References ...................................................................7

Appendices

A. Discussion of TDR Probe Offset and a Simple

Laboratory Method for Calculation........................... A-1

A.1 Discussion of Probe Offset ................................................................. A-1

A.2 The Compounding Effect of Signal Attenuation in

Connecting Cables ................................................................................. A-2

A.3 Method for Calculating Probe Offset Using Information from the

Terminal Mode of PCTDR..................................................................... A-3

A.3.1 Procedure for Calculating Probe Offset.................................... A-3

A.3.2 An Example Using CS605........................................................ A-4

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