Campbell TDR Manuale Scaricare il pdf (Pagina 5)

Table of Contents

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

2. Cautionary Statements...............................................1

3. Initial Inspection .........................................................1

4. Overview......................................................................1

5. Specifications .............................................................2

5.1 Physical Description.............................................................................2

5.2 Measurement Parameters .....................................................................2

5.3 Electromagnetic Compatibility ............................................................3

6. Installation...................................................................3

7. Operation.....................................................................3

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

7.1.1 Calculating Probe Offset...............................................................3

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

7.2.1 Electrical Conductivity Error from Attenuation............................4

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

7.4 Water Content Measurement Error from Soil Electrical

Conductivity .....................................................................................5

8. References ..................................................................7

Appendices

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 PC-TDR......................................................... 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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Campbell TDR Manuale Pagina 5